CHAPTER 23
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COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23-2 operating cycle. Surveys discussed in reference (a) are briefly summarized, as well as several additional survey techniques available and essential to an effective noise reduction program. In addition, a discussion of the model shipboard noise reduction program and available training programs are presented. References (b) and (c) provide class specific and comprehensive documentation on submarine noise reductions, including discussion of acoustic surveys, shipboard noise reduction program, acquisition systems, and procedures, data analysis and trending, and detailed write-ups with photographs and audio clips of typical noise sources. In addition, the manual contains an extensive library of documents and training aids. 23.1.2 Background. Reduction of the radiated noise signature of a submarine platform is a key element to the tactical employment of the ship. As a ship begins its operating cycle, a series of acoustic surveys are conducted to characterize the baseline noise signature. Then, throughout the remainder of its operating cycle, the ship requires the tools and procedures necessary to monitor its signature against the baseline. As deficiencies are identified, Ship’s Force needs to have an understanding of the extent to which an identified deficiency can affect the ship's radiated noise signature and the procedures required to effect corrective action. It should be kept in mind that although the implications of a degraded noise signature are fundamentally tactical in nature, the primary method of preserving a ship's acoustic advantage is through an aggressive and effective planned and corrective noise reduction maintenance program. Because of an increased emphasis in recent years, a number of new initiatives are being pursued within the technical community to develop new and improved measurement procedures and equipment that will assist Ship’s Force in more effectively assessing the effects of noise deficiencies on their radiated noise signature. These efforts should lead to improved survey procedures and will be incorporated into future changes to this chapter. 23.2 NOISE REDUCTION PROGRAM ELEMENTS. 23.2.1 Radiated Noise Surveys. 23.2.1.1 Naval Sea Systems Command Acoustic Trials. These trials are conducted at the beginning of and at various times throughout each ship’s operating cycle per reference (d) and provide a broad range of baseline measurements for the ship. In particular, the radiated noise signature of the ship is measured under various operating conditions. A determination is made of the controlling radiated noise offenders including those which are speed and depth dependent. While the principal objective of these trials is to assess the radiated noise signature of the submarine, platform, machinery and hull vibration, measurements are also made to provide baseline and supporting data in these areas for continued ship monitoring. 23.2.1.2 Coordinated Submarine Radiated Noise Analysis Exercise. This test must be conducted per reference (e), for Commander Submarine Force Atlantic (COMSUBLANT) units and Commander Submarine Force Pacific (COMSUBPAC) units. The primary objective of these submarine-versus-submarine exercises is to collect and analyze data to assess current acoustic vulnerabilities. These tests can be used during Pre-Overseas Movement (POM) or Deployment Preparation Period (DPP) work-ups to indicate that the deploying unit's acoustic signature is free of any unusual or highly detectable noise characteristics. 23.2.1.3 Coordinated Submarine Exercises (KILOEX, JTFEX, INT-2, TRACKEX, GUNSLINGER). While acoustic trials and surveys are the principal means to evaluate a submarine's acoustic profile, coordinated exercises provide another opportunity for the
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COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23-3 submarine force to monitor itself for noise deficiencies. Although the primary purpose of these exercises is generally tactically oriented, the noise signature obtained can and should also serve to monitor submarine radiated noise. It is incumbent upon exercise participants to note and record any unusual or excessive radiated noise being emitted by submarine exercise participants. Discrepancies noted should be reported to the cognizant Immediate Superior In Command (ISIC) for evaluation and corrective action. Initial message reports should be followed by supporting documentation including tape recordings, annotated LOFAR grams, and annotated frequency spectrum plots. The message report should contain the following information: a. Description of noi se signature problem. b. Date and time of detection. c. Range at detection. d. Sensor or processo r used for detection. e. Own ship depth and speed. f. Acoustic sea state. g. Water depth. h. Water temperature. i. Layer depth. 23.2.1.4 Beartrap Acoustic Radiated Trials. The primary objective of these trials is to provide a cost effective means to detect and identify radiated noise sources that have caused signature degradations. Coordinated trial events are conducted with Marine Patrol Aircraft. Detected narrowband tones in the radiated noise signature are provided by naval message. Parent ISICs are responsible for requesting these trials. Specific information, including message requests and scheduling requirements, as well as Ship's Force and Type Commander (TYCOM) responsibility is provided in Appendix B of this chapter. 23.2.2 Onboard Noise Surveys. The noise surveys discussed in this section do not provide conclusive information on the actual radiated noise signature of the ship. However, when these surveys are analyzed for developing trends, they can be effective tools for monitoring overall ship effectiveness in noise reduction. 23.2.2.1 Platform Noise Survey. This survey is conducted to define own ship's noise environment and is the best means available to Ship's Force to assess the radiated noise signature of the ship using only onboard equipment. Surveys are conducted by taking periodic measurements under various ship's operating conditions using the applicable Planned Maintenance System (PMS) Maintenance Requirement Cards (MRC). In addition, at-sea watch- to-watch aural monitoring is also conducted. Analysis of this data determines the platform noise signature and also identifies the noise offenders which affect this signature. When changes in the ship's signature occur, the diagnostic procedures of the class specific platform noise manual are used to isolate the noise source. Platform Noise Surveys should be conducted per enclosure (2a) of Appendix C of this chapter. Propeller cavitation surveys, a separate survey from the Platform Noise Survey but considered an important part of platform noise monitoring analysis, should be conducted per enclosure (2b) of Appendix C of this chapter.
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COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23-4 23.2.2.2 Topside and Housekeeping Survey. The most common and preventable sources of submarine noise are rattles emanating from improperly secured topside equipment, discontinuities in the hull, and machinery noise sound shorted to the hull due to improper stowage. 23.2.2.2.1 Topside Survey. The topside survey consists of a thorough inspection to identify and eliminate potential noise sources external to the pressure hull. Particular attention should be given to ensure that rattles are not installed, built in, or created by repairs, alterations, or stowage. Topside Surveys should be conducted per enclosure (2c) of Appendix C of this chapter. 23.2.2.2.2 Housekeeping Survey. The housekeeping survey consists of a thorough visual inspection to identify and eliminate these potential noise sources internal to the pressure hull. Particular attention should be given to ensure that sound shorts are not installed, built in, or created by repairs, alterations, or stowage. Housekeeping Surveys should be conducted per enclosure (2d) of Appendix C of this chapter. 23.2.2.3 Machinery Vibration Survey. A vibration survey conducted quarterly for both machinery health assessment and noise reduction purposes. Performance of this survey alone does not provide reliable information on radiated noise. Machinery Vibration Surveys should be conducted per enclosure (2e) of Appendix C of this chapter. 23.2.2.4 Hull Vibration Survey. A shipboard hull vibration survey is conducted quarterly or as required for the purpose of noise diagnostics by Ship's Force. The purpose is to assess acoustic deficiencies related to noise sources and transmission paths, and to estimate certain slow-speed, low frequency radiated noise levels. Hull Vibration Surveys should be conducted per enclosure (2e) of Appendix C of this chapter. 23.2.2.5 Isolation System Survey. This survey consists of a visual inspection of sound isolation components throughout the ship per applicable road maps and reference (f). These components include resilient mounts, pipe hangers, ground straps, and flexible piping. This visual inspection ensures that these devices are properly installed, undamaged and not sound shorted. Improper installation or failure of any of these devices will contribute to increasing the radiated noise signature of the ship. Isolation System Surveys should be conducted per enclosure (2f) of Appendix C of this chapter. 23.2.2.6 Damping Material Survey. This is a visual inspection of sound damping material installed in the vicinity of sonar arrays, sail, free flood spaces, and on machinery foundations. Like the isolation system survey, this inspection is designed to detect deficiencies in materials installed to limit the radiated noise signature of the ship. Damping Material Surveys should be conducted per enclosure (2g) of Appendix C of this chapter. 23.2.2.7 Predeployment Noise Inspections. Requirements and forms are contained in references (g) and (h) and Appendix D of this chapter. 23.2.2.8 Technical Onboard Monitoring Assist. This survey consists of at sea analysis by acoustic technical experts to evaluate the acoustic signature of the ship. The survey consists of a towed array, platform noise hydrophones and machinery and hull vibration measurements taken simultaneously to identify and localize major acoustic degradation. Emphasis is placed on training the submarine's crew on own ship noise data acquisition and analysis using their
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COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23-5 available sensors. Technical Onboard Monitoring Assists should be conducted per Appendix A of this chapter. 23.2.2.9 Sound Absorption Material Survey. This is a thorough visual inspection of interior sound absorption material and sound transmission loss material conducted in all spaces. These materials are installed to assist in habitability of the ship by absorbing vibration. Sound Absorption Material Surveys should be conducted per enclosure (2h) of Appendix C of this chapter. 23.2.2.10 Airborne Noise Survey. The airborne noise survey exists to identify shipboard areas whose airborne noise levels have increased or are possibly high enough to cause hearing damage. Airborne Noise Surveys should be conducted per paragraph 5.c.(6) of Appendix C of this chapter. 23.2.3 Shipboard Noise Reduction Program. The key to a successful shipboard noise reduction program will be the ability of the ship to identify potential noise deficiencies and to initiate prompt corrective action. References listed in Appendix E of this chapter should be a part of the ship's onboard library of submarine silencing publications. Several elements of the noise reduction program are discussed in the following paragraphs. 23.2.3.1 Noise Reduction Officer. To ensure a coordinated and aggressive approach to noise reduction, each ship will assign one of its senior Department Heads, as designated by the Commanding Officer, to serve as Noise Reduction Officer. The Noise Reduction Officer will coordinate the activities of all personnel assigned to support the ship's Noise Reduction Program. This officer will ensure that all required surveys are conducted, that identified deficiencies are documented, and that corrective action is initiated. A Noise Reduction Board, chaired by the Noise Reduction Officer, will convene at regular intervals to review the status of the Noise Reduction Program. Following each meeting, formal written reports will be made to the Commanding Officer. 23.2.3.2 Noise Deficiency Log. The ship's Equipment Status Log (ESL) will be used to record and track all noise deficiencies. Deficiencies will be entered in the section for the Work Center (WC) responsible for the equipment concerned. The Critical Noise Deficiencies (NC) or Potential Noise Deficiencies (NP) code (per paragraph 23.2.3.3) in the deficiency description block will tag the entry as a noise deficiency. The Noise Reduction Officer will ensure the ESL is properly maintained and accurately reflects the latest status of all noise deficiencies. Items to be entered in the ESL include noise deficiencies reported during radiated noise acoustic trials as well as those discovered during onboard surveys. Ship's logs must be maintained in a manner where all diagnostics, repairs or other evaluations performed are documented. The logs need to be maintained until noise issues are verified to be repaired by associated acoustic or vibration measurements. 23.2.3.3 Noise Related Maintenance Records. The OPNAV 4790/2K will be used to document all deferred and completed noise related maintenance actions. Block 46-G will be used to further classify noise deficiencies in one of two categories; NC and NP.
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COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23-6 NOTE: INFORMATION CONTAINED IN WORK CANDIDATES MUST BE UNCLASSIFIED. IF CLASSIFIED DATA IS REQUIRED TO FULLY DESCRIBE THE NATURE OF THE PROBLEM BEING REPORTED, REFER TO TYCOM REPORTING REQUIREMENTS TO FULLY DESCRIBE THE NATURE OF THE PROBLEM. a. The NC code will be used to identify defi ciencies of a critical nature identified during one of the following: (1) Naval Sea Systems Comma nd (NAVSEA) Acoustic Trials. (2) Supplemental Radiated Noise Measurements. (3) Technical Onboard Monitoring Assist. (4) Platform Noise Monitoring Surveys. b. The NP code will be used to identify deficiencies that could potentially be radiated noise problems identified during one of the following: (1) Topside and Housekeeping Surveys. (2) Machinery and Hull Vibration Surveys. (3) Isolation System Surveys. (4) Damping Material Surveys. (5) Airborne Sound Absorption Material Surveys. (6) Routine Ship Operations. 23.2.4 Training. Formal training course prerequisites and descriptions are listed in reference (i). Specific training requirements are contained in references (j) through (n). 23.3 RESPONSIBILITIES. 23.3.1 Immediate Superior In Command. a. Assign a Staff Noise Reduction Officer as a specific point of contact for all matters relating to noise reduction within the Squadron. b. Oversee and supervise the Noise Reduc tion Program within the Squadron, ensuring that assigned units aggressively identify and correct noise deficiencies. c. Submit requests for Beartrap Acoustic Radiated Trials (BART) to COMSUBLANT N454, or COMSUBPAC N42N, as appropriate. d. Schedule acoustic surveys during the operati ng cycle of submarines per reference (d). e. Recommend, authorize, or both, correc tive actions based on the findings of the surveys conducted. f. Review Noise Reduction Program records, survey results, procedures and monitoring equipment during material readiness inspections, Tactical Readiness Evaluations and POM or DPP certification. g. Schedule divers to conduct underwater hull and propeller surveys for noise deficiencies prior to undocking, pre-deployment, post-deployment, and during upkeep.
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COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23-7 h. Report propeller replacements using th e message format of Appendix F of this chapter. i. Ensure that personnel tasked to support assigned submarines are adequately trained in submarine noise reduction. 23.3.2 Industrial Activity. a. Ensure proper handling and re pair of noise critical machinery. b. Conduct in-shop and in-place balancing of all rotating equipment, both motors and coupled units, repaired by the industrial activity. c. Conduct in-place balancing as authorized by work requests. d. Assist ships in identif ying and correcting noise problems and in conducting noise surveys following approved work requests. e. Establish new baseline machinery and hu ll vibration measurement data for repaired units. f. Ensure that all applicable personnel are adequately trained in submarine noise reduction. g. Conduct underwater hull and pr opeller surveys for noise deficiencies per reference (g). 23.3.3 Submarine Commanding Officer. a. Establish and maintain a ship's Noise Reduction Program consistent with this chapter. Appendix C of this chapter provides the basis for a shipboard instruction to meet this requirement. b. Appoint a senior Department Head as No ise Reduction Officer and establish a Ship's Noise Reduction Board.
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COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23A-1 APPENDIX A APPENDIX A SUPPLEMENTAL NOISE MEASUREMENTS This Appendix provides a brief discussion of the TYCOM sponsored, noise measurements that may periodically be conducted on submarines during their operating cycle. TECHNICAL ONBOARD MONITORING ASSIST (TOMA) 1. Purpose. TOMAs are conducted on submarines to maintain their acoustic signatures between scheduled radiated noise trials. Major acoustic degradations and their corrective actions are identified, and training is provided to Ship’s Force. 2. Procedure. TOMA schedules are coordinated by the TYCOMs and the Squadrons. TOMAs are conducted by Naval Surface Warfare Center Carderock Division (NAVSEAWARCEN CD), with assistance from on-site Performance Monitoring Team (PMT) and Ship's Force personnel. TOMAs need 18 to 30 hours of data acquisition time. Normally, TOMAs are conducted on three to seven-day underways and can be scheduled concurrently with other operations. Tests consist of a series of runs in various machinery line-ups to collect data required to assess the acoustic signature of the submarine. Data is collected using onboard sensors and compared to baseline signatures from previous acoustic trials. A TOMA will serve as the quarterly hull, machinery, and platform noise surveys. 3. Frequency. TOMAs are to be conducted prior to, or early in the POM or DPP cycle when no radiated noise trial is scheduled to occur within one year of the deployment date. NOTE: A TOMA IS NOT A SUBSTITU TE FOR THE NAVAL SEA SYSTEMS COMMAND ACOUSTIC TRIAL. A TOMA MAY ALSO BE REQUESTED BY THE SUBMARINE'S ISIC. 4. Reports. NSWCCD will issue a “quick look” message from the submarine at the completion of the TOMA. This message will detail significant findings and recommended corrective actions, as well as the status of previous corrective actions. A separate message will be sent by NSWCCD detailing hull and machinery vibration data. 5. Action. Ship’s Force and the submarine's ISIC should use the results and recommendations of the TOMA “quick look” message to schedule and implement corrective action. Ship’s Force should use the 3-M Maintenance Data System to document deficiencies and corrective actions. For deferred items, the Noise Reduction Officer should develop and implement appropriate corrective action.
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COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23B-1 APPENDIX B APPENDIX B BEARTRAP ACOUSTIC RADIATED TRIALS (BART) 1. Purpose. BARTs provide submarines with the opportunity to measure and assess their narrowband radiated noise signatures, identify problems, and provide an opportunity to correct deficiencies and evaluate their acoustic health prior to certain deployments. 2. Procedure. BARTs are initially scheduled by TYCOM prior to major deployments or upon request by the submarine’s ISIC. The ISIC is then responsible for updating the TYCOM on schedule changes. BARTs are a structured Beartrap in a designated quiet ocean area following the BART agenda. The objective is to collect sufficient data to determine the radiated noise signature and mission readiness of the ship. Data collection on station is accomplished by Commander Patrol Reconnaissance Forces Pacific (COMPATRECONFORPAC) or Commander Patrol Reconnaissance Forces Atlantic (COMPATRECONFORLANT) Anti-Submarine Warfare patrol aircraft and is restricted to a single eight-hour period during ship operations in a designated ocean area. 3. Frequency. For COMSUBPAC units, ISICs should coordinate BART scheduling for their submarines such that each ship will be tested prior, or early in the DPP. The schedule should allow sufficient time for corrective action on noise deficiencies detected during the BART to be planned and accomplished during a DPP upkeep period. For COMSUBLANT units, ISICs should coordinate BART scheduling for their submarines as required. 4. Reports. For Pacific Fleet submarines, COMPATRECONFORPAC will issue a message within 60 days of completion of a BART. For Atlantic Fleet submarines, “quick look” message will be issued following Local Operating Instructions. 5. Action. Ship’s Force and the submarine’s ISIC should use the results of the BART messages to schedule and implement corrective action for noise deficiencies detected during the trial. For deferred items, the Noise Reduction Officer should develop and implement appropriate corrective action.
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COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23C-1 APPENDIX C APPENDIX C SHIPBOARD NOISE REDUCTION INSTRUCTION USS (Ship's Name and Hull No.) Subj: SHIP’S NOISE REDUCTION PROGRAM Ref: (a) COMUSFLTFORCOMINST 4790.3; Jo int Fleet Maintenance Manual, Volume VI, Chapter 23 Encl: (1) Quarterly Noise Re duction Program Status Report (2) Noise Reduction Surveys (3) Control Surface Noise Questionnaire 1. Purpose. To establish a ship’s Noise Reduction Program to include: a Noise Reduction Board to advise the Commanding Officer concerning appropriate noise reduction procedures; a set of noise surveys to characterize the ship’s noise signature; and procedures to ensure proper coordination of efforts in the ship's noise reduction program. 2. Discussion. A great deal of emphasis has been placed on upgrading noise reduction awareness within the submarine force. As required by reference (a), (Ship’s Name) must devote continued attention to the detection, correction and prevention of increases in its radiated noise signature. Significant mission degrading radiated noise problems could not be tolerated in wartime. (Ship’s Name) must minimize noise to maximize the ships detection range of threats and targets and to reduce the possibility of hostile ships detecting (Ship’s Name). Quietness is absolutely essential to the ships primary mission and a continuous, aggressive effort must be made in acoustic housekeeping and noise reduction to ensure a quiet ship. The acoustic surveys considered mandatory for effectively maintaining a quiet ship and improving the ship’s acoustic signature during the operating cycle are discussed in this instruction. While these surveys serve as a formal means of noise reduction, each crew member’s actions play an equally important role in the noise reduction consciousness of the entire ship. A quiet ship requires involvement of the whole crew. THINK QUIET! 3. Program Organization. a. A ship’s Noise Reduction Board must be established to assist the Commanding Officer in the development and execution of long and short range plans for maintaining and enhancing the acoustic posture of the ship. The board will recommend appropriate shipboard noise reduction procedures and monitor their execution. The board will consist of the following personnel: (1) Executive Officer. (2) Combat Systems Officer. (3) Engineer Officer. (4) Sonar Officer. (5) Electrical Officer. (6) First Lieutenant. (7) Sonar Division Leading Petty Officer.
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COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23C-2 APPENDIX C (8) Electrical Division Noise Reduction Petty Officer (NRPO). (9) Chief of the Boat. (10) Sail Coordinator. b. To assist the board in ca rrying out their responsibilities, experienced Petty Officers and non-rated personnel who have completed qualification in submarines must be assigned in the ship’s collateral duties notice as NRPO. Each division will have at least one formally designated NRPO. 4. Program Management. a. The Noise Reduction Officer will coordinate all noise reduction activities within the ship. The Noise Reduction Board will meet quarterly and discuss actions completed and further action required to correct outstanding noise deficiencies. Special quarterly noise reduction boards should be held prior to the initial work definition conference for depot availabilities (initial planning meetings are typically scheduled; Selected Restricted Availability and Interim Drydocking A-43 weeks, Depot Modernization Period and Engineered Refueling Overhaul A-12 months) and prior to POM1 upkeep periods. The Noise Reduction Officer will chair these meetings. The Noise Reduction Officer will ensure that the noise reduction portion of the ESL contains updated entries on all outstanding noise deficiencies. Each of the significant noise deficiencies will be discussed at every meeting. The Commanding Officer will be apprised of the results of the meeting and any unresolved problems shortly after the meeting. Formal written reports summarizing the status of the Noise Reduction Program will be submitted following each meeting to the Commanding Officer using the format of enclosure (1). b. Onboard surveys will be conducted per this instruction. Noise deficiencies discovered during these surveys or detected during routine ship’s operations will be reported to the Noise Reduction Officer. At sea, these reports will be made to the Officer Of the Deck (OOD) who will, in turn, inform both the Noise Reduction Officer and the Commanding Officer. The OOD will initiate corrective action for all significant noise deficiencies and ensure that these items are included in the watch turnover. All deficiencies that are not immediately correctable will be entered in the noise deficiency section of the ESL. c. The Noise Reduction Officer must ask the following questions during each Noise Reduction Board meeting. (1) Have Ship’s Force effected all co rrective action recommendations from the latest acoustic trials? Have on board measurement surveys conclusively proven that outstanding noise deficiencies were corrected? Report all unresolved items to the Commanding Officer using the format of enclosure (1). (2) Have any noise sources, especially ra ttles or control surface transients, been aurally detected during the conduct of the platform noise survey of enclosure (2a)? If rattles or transients are present, have tape recordings or data packages been accomplished following platform noise or maintenance manual guidance for submission?
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COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23C-3 APPENDIX C (3) Have Ship’s Force conducted a prop eller tip cavitation survey per enclosure (2b)? Are the measured tip cavitation points acceptable? If cavitation is not acceptable, has a tape package been prepared per reference (a)? (4) Have any signature degradations been identified from the latest set of towed array, platform noise hydrophone or machinery and hull vibration measurements? If so, have the noise sources been identified? Report unresolved items to the Commanding Officer using the format of enclosure (1). 5. Action. a. The Executive Officer must: (1) Attend all Noise Reduction Board meetings. (2) Implement a comprehensive, all hands training program to elevate the awareness of Ship's Force personnel to the importance of noise reduction. b. The Noise Reduction Officer must: (1) Coordinate and administer th e ship’s Noise Reduction Program. (2) Schedule Noise Reduction Board m eetings and chair their meetings. (3) Report the status of noise deficien cies to the Commanding Officer following meetings of the Noise Reduction Board. Submit written summary reports to the Commanding Officer using the format of enclosure (1). (4) Ensure that cognizant divisions ente r all noise reduction deficiencies in the ESL, that prompt corrective action is taken by responsible divisions and that work requests are submitted for deficiencies beyond the capability of Ship’s Force. (5) Ensure that acoustic trial deficien cies are entered in the ESL and that appropriate corrective action is initiated. (6) Assess the tactical implications of noise deficiencies detected during underway operations and make recommendations to the Commanding Officer as to tactical limitations and required corrective action. (7) Ensure that cognizant divisions have men properly trained in Ship’s Force acoustic surveys, noise reduction equipment, proper bearing replacement and in-place balancing of rotating equipment. (8) Ensure that surveys are being c onducted by cognizant divisions and that deficiencies are reported to the Commanding Officer. (9) Conduct spot reviews of acoustic survey results. (10) Be inventory manager of all publicat ions required by reference (a), to support the Noise Reduction Program and ensure that divisions have applicable MRCs. (11) Assist the Engineer Officer with the implementation and maintenance of the ship’s quiet bills.
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COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23C-4 APPENDIX C (12) Ensure action is taken, to the maximu m extent possible, to complete enclosure (3) for all identified control surface noises. c. The Sonar Officer must: (1) Ensure that the Platform Noise Survey is accomplished, recorded, and analyzed per enclosure (2a). (2) Perform Propeller Cavitation Noise Su rveys as required per enclosure (2b). (3) Develop propeller cavita tion curves per enclosure (2b) and forward results to the Commanding Officer via the Noise Reduction Officer. (4) Direct the use of the installed sonar systems to assist in the identification and isolation of noise related material deficiencies detected in Topside, Housekeeping, Machinery and Hull Vibration, and Isolation System Surveys. (Enclosures 2c, 2d, 2e, and 2f respectively refer). (5) Ensure that Damping Material Surveys are accomplished, recorded, and analyzed per enclosure (2g). (6) Ensure the Airborne Noise Surveys are accomplished, recorded, and analyzed following the applicable Maintenance Index Page (MIP). The Sonar Officer must ensure that airborne noise levels in all shipboard areas remain within permissible limits. An Airborne Noise survey must be conducted when increased airborne noise levels are suspected of exceeding permissible limits. A written report in memorandum form must be submitted for each watch station and must include, as a minimum, the date of inspection, names of personnel conducting the survey, and the discrepancies noted in the ESL. Review the status of noise level measurements and any affected watch station and report this information to the Commanding Officer and the ship’s corpsman. (7) Report immediately any abnormal in crease in own ship’s noise to the OOD and the Noise Reduction Officer. (8) Ensure that all survey deficiencies ar e entered in the noise reduction section of the ESL and reported to the Noise Reduction Officer. Ensure that prompt corrective action is taken and that work requests are submitted for deficiencies beyond the capability of Ship's Force. (9) Ensure that personnel assigned to conduct noise reduction surveys under his cognizance are properly trained. d. The Electrical Officer must: (1) Ensure that the Machinery and Hull Vibration Surveys are accomplished, recorded, and analyzed per enclosure (2e). (2) Ensure that in-place balancing is conducted on an assembled unit at any time that repairs are made by Forces Afloat that would affect the balance of the equipment.
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COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23C-5 APPENDIX C (3) Determine the cause of out of sp ecification machinery and hull vibration readings and initiate corrective action. (4) Ensure that prompt corrective actio n is taken and that work requests are submitted for deficiencies beyond the capability of Ship’s Force. (5) Ensure that personnel under his cognizance assigned to conduct noise reduction surveys are properly trained. e. The First Lieutenant must: (1) Ensure that the Topside and Housekeeping Surveys are accomplished, recorded, and analyzed per enclosure (2c) and (2d). (2) Ensure that the Sound Absorption Material Survey is accomplished, recorded, and analyzed per enclosure (2h). (3) With the assistance of the Supply Of ficer, ensure that equipment, stores, personal effects, and consumables are stowed in a manner that will not produce noise or transmit noise to the ship’s hull or structure. (4) Ensure that all survey deficiencies ar e entered in the noise reduction section of the ESL and reported to the Noise Reduction Officer. Ensure that prompt corrective action is taken and that work requests are submitted for deficiencies beyond the capability of Ship’s Force. (5) Ensure that personnel under his cognizance assigned to conduct noise reduction surveys are properly trained. f. The NRPO must: (1) Promote the Noise Reduction Prog ram in their respective divisions. (2) Perform or assist in the performa nce of noise reduction surveys under their respective division's cognizance per enclosure (2). (3) Enter all survey deficiencies in the noise reduction section of the ESL and report deficiencies to the cognizant Division Officer. g. The OOD must: (1) Remain aware of the status of critical noise deficiencies and operate the ship in a manner that will minimize its radiated noise signature. (2) Report all new noise deficiencies and the correction of existing deficiencies to the Noise Reduction Officer and the Commanding Officer. Ensure new deficiencies are recorded in the noise reduction section of the ESL. (3) Ensure sonar watchstanders conduct aural monitoring of own ship’s noise signature upon initial dive and once per watch.
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COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23C-6 APPENDIX C From: Noise Reduction Officer To: Commanding Officer Via: Executive Officer Subj: QUARTERLY NOISE REDUCTION PR OGRAM STATUS REPORT FOR PERIOD ENDING (DATE) Encl: (1) Noise Reduction Section of ESL 1. The following MRCs associated with the Noise Reduction Program were not accomplished, partially accomplished, or deferred: MRC No., Deficiency reason or Corrective Action 2. The following noise deficiencies were identified during the current period: Deficiency, Source, ESL No. or Plan of Action for identification and repair 3. The following previously identified noise de ficiencies were corrected during the current period: Deficiency or Corrective Action 4. The following noise deficiencies from the previous period are outstanding: Deficiency, Source, ESL No., Diagnostics and repairs performed or Plan of Action for identification and repair 5. Enclosure (1) summarizes all currently outstan ding deficiencies associated with the Noise Reduction Program.
Submitted:_____________________________ Noise Reduction Officer
Copy to: Engineer Officer
Enclosure (1)
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COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23C-7 APPENDIX C NOISE REDUCTION SURVEYS 1. This enclosure contains a description of the onboard surveys conducted in support of the Noise Reduction Program. For each survey, applicable references are cited and a summary of procedures and reporting requirements are presented. Surveys included are: Enclosure 2a Platform Noise Survey 2b Propeller Cavitation Noise Survey 2c Topside Survey 2d Housekeeping Survey 2e Machinery and Hull Vibration Survey 2f Isolation System Survey 2g Damping Material Survey 2h Sound Absorption Material Survey
Enclosure (2)
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COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23C-8 APPENDIX C PLATFORM NOISE SURVEY Reference: (a) Class Applicable Technical Ma nual for Platform Noise Monitoring Analysis for Noise Reduction (b) Class Applicable SO-544 MIP/MRCs (c) OPNAVINST 5513.5A Depart ment of the Navy (DON) Security Classification Guidance for Undersea Warfare Programs 1. Responsibility. Sonar Officer. 2. Procedure. a. Platform Noise Surveys must be conducte d as specified in references (a) and (b). b. Sonar supervisors must monitor each hydrophone for objectionable noises at least once each watch while underway and report results to the OOD. Problems detected must also be recorded in the Noise Reduction section of the ESL. Problem investigation and corrective action must be initiated as soon as possible within the current operations schedule. c. As soon as feasible, after diving, following an inport period, accomplish the following: (1) Monitor each platform hydrophone fo r objectionable noise while changing speed in five-knot increments up to Flank speed (monitor all frequency bands where applicable). At slow speed, monitor hydrophones nearest the rudder, stern planes and fairwater planes while each control surface is cycled. Monitor the hydrophone nearest the sail while each mast and antenna is cycled. If control surface deficiencies are found, complete the applicable portions of the Control Surface Noise Questionnaire, enclosure (3), to report control surface noise. This questionnaire assists in troubleshooting. (2) Check at least one point of the prope ller cavitation curve. If results are significantly different from the previous data, establish a new cavitation curve at the earliest opportunity as discussed in enclosure (2b). (3) If operations preclude complete accomplishment of sub-paragraph (1) and (2), speeds and areas not monitored should be noted and carried forward in the sonar supervisor’s log until they can be monitored. (4) Results of this monitoring will be reported to the OOD and deficiencies recorded in the ESL. d. For any abnormal noises, magnetic tape reco rdings should be made per reference (a). These tape recordings together with complete supporting data must be forwarded by priority registered mail second day delivery to: For COMSUBLANT units : Carderock Division Naval Surface Warfare Center 9500 MacArthur Blvd. West Bethesda, MD 20817-5700 Attn: Code 711 - Fleet Support Program Manager Enclosure (2a)
p. 862
COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23C-9 APPENDIX C For: New London Units, data packages should be forwarded to: NSSC NEW LONDON CT, N42 For COMSUBPAC units: Naval Surface Warfare Center Carderock Division Bremerton Detachment 530 Farragut Ave Attn: Code 713 Bremerton, Washington 98314-5215 NOTE: SIPRNET FILES FROM SHIP SHOU LD BE LIMITED TO 400KB. HUITS AND SAILOR-MAIL CAN BE UTILIZED FOR LARGER FILES. MP3 OR OTHER COMPRESSED FORMATS SHOULD BE USED TO SAVE SPACE. 10-15 SECONDS OF AUDIO IS USUALLY ADEQUATE. IF URGENT REQUEST ON EVENINGS, HOLIDAYS, OR WEEKENDS, HAVE SWO CONTACT TYCOM STEALTH OFFICERS TO EXPEDITE. DURING TYCOM WORKING HOURS, NOISE REDUCTION SUPPORT CAN BE PROVIDED VIA CHAT. SUPPORT CAN BE ARRANGED ON EVENINGS OR WEEKENDS THROUGH SWO. To receive immediate feedback, audio files can be sent via SIPRNET or other secure method to: For COMSUBLANT units: To: SUBLANT - [email protected] CC: [email protected] (if immediate response is required), ISIC, or operational commander as required. For COMSUBPAC units: To: SUBPAC - [email protected] CC: [email protected] (if immediate response is required), ISIC, or operational commander as required. Units should request analysis and re commendations for corrective action from NSWCCD. The response will be provided by message within 72 hours of receipt of the data package. If the package needs to be expedited, contact TYCOM Noise Reduction Officer prior to submission. e. Platform noise hydrophone recordings are classified CONFIDENTIAL per reference (c), (Encl 55). If recordings include towed array signature data, then the classification is SECRET.
Enclosure (2a)
p. 863
COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23C-10 APPENDIX C 3. Frequency. Surveys will be conducted as specifi ed within this instruction, reference (a) and applicable MRCs. Additional surveys will be conducted as required to support noise reduction efforts related to other shipboard surveys or whenever such monitoring is required for the identification of noise degradations or to verify the effectiveness of corrective actions. 4. Record. Survey results will consist of platform noise spectra, cavitation data, and entries to the ESL and Sonar Line Log. Records will be kept as specified within this instruction, in reference (a) or as required to meet the needs of noise reduction efforts aboard ship. 5. Review. The Sonar Officer will review result s of all surveys weekly and the Noise Reduction Officer will review all records in conjunction with Noise Reduction Board meetings monthly.
Enclosure (2a)
p. 864
COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23C-11 APPENDIX C PROPELLER CAVITATION NOISE SURVEY Reference: (a) Class Applicable Technical Ma nual for Platform Noise Monitoring Analysis for Noise Reduction (b) NTTP 3-54.1 Submarine Tactical Security Manual 1. Responsibility. Sonar Officer. 2. Procedure. Propeller cavita tion surveys and diagnostic procedures will be conducted as specified in reference (a). Propeller cavitation curves will be developed using the procedural guidance of reference (a), for the various tactical considerations specified in reference (b). 3. Frequency. Since the ship's operating schedul e dictates the frequency at which propeller cavitation surveys can be made, no specific frequency can be assigned. However, a complete cavitation survey should be made after any CNO Maintenance Availability or upkeep period. One point of the current cavitation curve should be verified at the beginning of each underway period. If results are significantly different, a complete new curve should be developed. 4. Unacceptable Propeller Tip Cavitation Perfor mance. Propeller replacement due to poor acoustic performance is often based on unacceptable tip cavitation. Naval Surface Warfare Center, Carderock Division (NSWCCD) personnel verify the ship recorded cavitation points and provide feedback to the TYCOM and the ship. Ships with emergent poor cavitation performance should immediately record and forward cavitation curve tapes per the Platform Noise Survey Section of this Appendix. 5. Reports. The original and the five most recent cavitation curves will be retained and compared for trend analysis until the propeller is changed. 6. Review. The Sonar Officer must compare new cavitation curves to previous ones and forward the results to the Commanding Officer via the Noise Reduction Officer.
Enclosure (2b)
p. 865
COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23C-12 APPENDIX C TOPSIDE SURVEY Reference: (a) MIP SO-591/901 MRC BNJ6 (R-1) 1. Responsibility. Noise Reduction Officer. 2. Procedure. The First Lieutenant must ensure that the following items are accomplished per reference (a): a. Open and inspect all line lockers and fr ee flood areas for loose gear and other sources of noise, such as loose zincs, rattling pipes, loose grates, etc. b. Check all deck hatches to ensure they shut properly and will not rattle. c. Check that all towed-array fairing plat es are properly secured (if applicable). d. Check all cleats for proper operation and en sure that they do not rattle when stowed. e. Check stowage of all portable equipment t opside to ensure that proper gasket material is installed, all bolts and wing nuts are present, and equipment is securely held in place when mounted. f. When required, inspect sail area for loose gear and sources of rattles. Particular attention should be given to the mast bearings and operating equipment to ensure that masts will not be damaged or fouled. Before reinstalling sail plates, the sail should be inspected by the Noise Reduction Officer. 3. Frequency. A complete Topside Survey, incl uding the sail, must be conducted after any major upkeep or inport period, or whenever major topside work is completed. A sail closeout inspection must be conducted by an officer prior to the reinstallation of any sail plate removed. Surveys should be completed as far in advance of underway as possible. Other inspections must be conducted as directed by the First Lieutenant. 4. Reports. A written report in memorandum form must be submitted to the Commanding Officer at the completion of each inspection. This report must include, as a minimum, the date the inspection was made, names of personnel conducting the inspection and uncorrected discrepancies noted in the ESL. Reports must be routed via the Noise Reduction Officer, with copies to cognizant Department Heads. 5. Review. A written report in memorandum form will be submitted for each inspection and will include, as a minimum, the date of the inspection, names of personnel conducting the inspection and the discrepancies noted in the Equipment Status Log. This report must be reviewed by the First Lieutenant and retained by the Noise Reduction Officer until all discrepancies are corrected.
Enclosure (2c)
p. 866
COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23C-13 APPENDIX C HOUSEKEEPING SURVEY Reference: (a) MIP SO-591/901 MRC BNJ7 (R-2) 1. Responsibility. Noise Reduction Officer. 2. Procedure. It is the responsib ility of the NRPO to inspect their division's spaces per reference (a) for sound shorts or other silencing discrepancies which may result from improper stowage of loose gear. 3. Frequency. Improper stowage is a continuous probl em and should be monitored as such. It is the responsibility of all hands to monitor the stowage of all gear and to ensure that sound shorts are not created by improper stowage. OODs, Engineering Officers Of the Watch and all watchstanders are required by other instructions to inspect various spaces. These inspections should include monitoring for proper stowage and possible sound shorts. Prior to getting underway, all divisions must inspect their spaces for proper stowage at sea. Division Officers should acknowledge by signature on respective pre-underway check sheets that their spaces are stowed for sea. 4. Reports. Potential sound short discrepancies wi ll be reported to the OOD who will inform the Commanding Officer and responsible Department Heads, to ensure that problems are corrected. Discrepancies not immediately corrected must be noted in the ESL. 5. Review. The Noise Reduction Officer must review all pre-underway check sheets and maintain a record of all noise discrepancy items until corrected.
Enclosure (2d)
p. 867
COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23C-14 APPENDIX C MACHINERY AND HULL VIBRATION SURVEY Reference: (a) Class Applicable Technical Ma nual for Machinery and Hull Vibration Testing and Monitoring of SSN/SSBN/SSGN Auxiliary Machinery (b) MIP 4910/Series Vibration Noise Monitoring 1. Responsibility. Electrical Officer. 2. Procedure. Machinery and hull vibration survey s must be conducted as specified in reference (a) and following applicable PMS (reference (b)). Items found to be out-of-specification will be logged in the ESL as potential noise deficiencies. Machinery and hull vibration surveys are conducted on all submarines. 3. Frequency. A comprehensive machinery a nd hull vibration survey should be conducted quarterly by Ship’s Force. Results are submitted to PMT, who in turn forwards the packages to the applicable NSWC Detachment. Specific machinery and hull vibration monitoring surveys must be conducted by Ship's Force bi-weekly on selected equipment identified in the NSWC, machinery Vibration Deficiency Message and as required to support onboard noise reduction efforts. 4. Reports. a. NSWC evaluates and maintains machinery and hull vibration data collected by Ship's Force. They report out-of-specification equipment or hull vibration levels via message. b. During each machinery and hull vibration survey, a report is submitted to NSWC via the local PMT. This report must include the sound cut data and a feedback package. c. For the Hull Vibration Monitoring Pr ogram, a message should be sent from the submarine to NSWC within 45 days of receipt of the NSWC hull vibration deficiency message or when operationally feasible. This message should include the results of actions taken to identify and correct the sources of excessive hull vibration levels and to identify platform noise sources. 5. Noise Reduction Training. Crew training in noise awareness and noise reduction is absolutely essential to maintaining a quiet ship. The Submarine Force Training Manual discusses formal training courses and requirements pertaining to noise reduction as well as materials available for onboard training. 6. Review. The Electrical Officer must review a nd forward the results of all machinery and hull vibration measurements to the Commanding Officer via the Noise Reduction Officer and Executive Officer. This report must be submitted within five working days of the survey and must include a listing of which noise measurements have been taken and any out-of- specification equipment.
Enclosure (2e)
p. 868
COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23C-15 APPENDIX C ISOLATION SYSTEM SURVEY Reference: (a) NAVSEA S9073-AW-SNC -010/(U) Ship Acoustical Surveys (b) NAVSEA S9073-AF-SNC-010/ (C), Ship Noise Control (c) Appropriate Noise Control Guidel ines, Road Maps, and Equipment Guide Lists (d) Appropriate System MIPs 1. Responsibility. Noise Reduction Officer. 2. Procedure. The Noise Reduction Officer must require Ship's Force to conduct a visual inspection of silencing equipment and components such as resilient mounts, flexible pipe, pipe hangers, ground straps, electrical connections, etc., to ensure they are properly installed, within periodicity, undamaged and not sound shorted. References (a), (b), (c) and (d) apply. When funded, these inspections will be conducted by a NAVSEA designated activity, however, the ship is still responsible for conducting the survey regardless of NAVSEA funding. 3. Frequency. An Isolation System Survey must be conducted as specified by reference (d) per reference (a). Additionally, a localized isolation system survey must be conducted in the area of sound isolated equipment change-outs and in the area of work accomplished on sound isolated systems. When requested and funded, a NAVSEA designated activity must provide training and assist in the performance of an isolation system survey. 4. Reports. The Noise Reduction Officer must ensu re that all defects found are logged in the ESL and must report survey results to the Commanding Officer within five working days of completion of the inspection. 5. Review. The Noise Reduction Officer must mainta in a record of all discrepancies noted until corrected.
Enclosure (2f)
p. 869
COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23C-16 APPENDIX C DAMPING MATERIAL SURVEY Reference: (a) NAVSEA S9073-AW-SNC- 010/(U), Ship Acoustical Surveys (b) NAVSEA S9073-AF-SNC-010/ (C), Ship Noise Control 1. Responsibility. Sonar Officer. 2. Procedure. The Sonar Officer must ensure that a thorough inspection is conducted of all damping material installed in sonar array areas, fairwater, main ballast tanks, and free flood areas, to ensure that no deterioration has taken place per the guidance provided in reference (a). Reference (b) provides specific information relating to these materials. 3. Frequency. A Damping Material survey must be conducted as specified at each dry-docking, per reference (a). 4. Reports. A written report in memorandum fo rm must be submitted for each inspection and must include, as a minimum, the date of inspection, names of personnel conducting the inspection, and the discrepancies noted in the ESL. 5. Review. The Sonar Officer must review the results of each inspection and forward them to the Commanding Officer via the Noise Reduction Officer within five working days of the completion of the inspection. This report must be retained by the Noise Reduction Officer until all discrepancies have been corrected.
Enclosure (2g)
p. 870
COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23C-17 APPENDIX C SOUND ABSORPTION MATERIAL SURVEY Reference: (a) NAVSEA S9073-AW-SNC- 010/(U), Ship Acoustical Surveys (b) NAVSEA S9073-AF-SNC-010/ (C), Ship Noise Control 1. Responsibility. First Lieutenant. 2. Procedure. The First Lieutenant will ensure that a thorough inspection of the interior sound absorption and sound transmission loss material is conducted in all spaces. This inspection ensures that no deterioration of these materials has taken place. This inspection is accomplished with guidance from reference (a), while reference (b) provides specific information relating to these materials. 3. Frequency. A Sound Absorption Material Survey must be conducted prior to each major CNO Maintenance Availability. An inspection of any system affected by maintenance or other work must be conducted following completion of the work. 4. Reports. A written report in memorandum form will be submitted to the Noise Reduction Officer for each inspection and will include, as a minimum, the date of the inspection, names of personnel conducting the inspection, and discrepancies noted in the ESL. 5. Review. The First Lieutenant will review th e results of each inspection and forward them to the Commanding Officer via the Noise Reduction Officer within five working days of the completion of the inspection. This report will be retained by the Noise Reduction Officer until all discrepancies have been corrected.
Enclosure (2h)
p. 871
COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23C-18 APPENDIX C CONTROL SURFACE NOISE QUESTIONNAIRE 1. The purpose of this questionnaire is to provide more accurate and definitive information than reports of "noise in the fairwater" or “noise in the mud tank”. This information can reduce troubleshooting time, prevent unnecessary maintenance, and perhaps prevent an unnecessary and unscheduled dry-docking. It can also furnish vital data to assist in the resolution of a problem and prevent its recurrence. It is very important to monitor the audio during the greasing operations; the effects of greasing for worn bearings can be short. 2. Record audio of all platform noi se evaluations per reference (a). 3. Perform all evaluations in all modes (Normal, Emergency and Automatic where applicable). 4. Note how long greasing effects the noise characte ristics of the control surface (minutes, hours, days or months). Hull Number: ____________ Date:_____________ Check the appropriate box or fill in the blanks in response to these questions: 1. Give the date when the noise was first noticed: 2. Which control surface is susp ected of causing the noise? a. Fairwater or Bow Planes Yes No b. Stern Planes Yes No c. Rudder Yes No 3. Was the noise observed upon leaving port? Yes No a. If not observed upon leaving port, after how many days at sea? ________________ 4. Was the noise first observed during the first high speed run? Yes No 5. Was any work performed on this sy stem, associated systems, or in its vicinity during the last refit or upkeep period (including welding or sandblasting)? Yes No a. If yes, describe work
6. How was the noise first detected? a. Audible to crew Yes No b. Self noise monitoring system Yes No (1) If yes, which system? c. Other? (Describe)
7. Is the noise detected on any hydrophones? Yes No a. If so, which hydrophone displayed the highest levels? __________________ b. How does this hydrophone le vel compare to the most recent acoustic trial report or more recent baseline?
(CONFIDENTIAL when filled in) Enclosure (3)
p. 872
COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23C-19 APPENDIX C 8. Is the noise: a. Barely audible? Yes No b. Moderate? Yes No c. Loud? Yes No 9. Since it was first detected, has the noise level: a. Increased? Yes No b. Decreased? Yes No c. Remained constant? Yes No d. Fluctuated? Yes No 10. During cycling of the co ntrol surface, is the noise: a. Constant? Yes No b. Intermittent? Yes No 11. If intermittent, has the frequency of the occurrence of the noise: a. Increased? Yes No b. Decreased? Yes No c. Remained constant? Yes No 12. Describe the type of noise heard. a. Clanking? Yes No b. Thudding? Yes No c. Groaning? Yes No d. Rubbing? Yes No e. Squealing? Yes No f. Chattering? Yes No g. Galloping? Yes No h. Hydraulic flow? Yes No i. Other? (Describe)
13. When, during the motion of the cycl e of the planes is the noise heard (check all that apply): a. At start of motion towards rise or right? Yes No b. At start of motion towards dive or left? Yes No c. At the end of motion towards rise or right? Yes No d. At the end of motion towards dive or left? Yes No e. Entering the rise or right hardstop? Yes No f. Entering the dive or left hardstop? Yes No g. Leaving the rise or right hardstop? Yes No h. Leaving the dive or left hardstop? Yes No i. The entire length of travel towards rise or right? Yes No (CONFIDENTIAL when filled in) Enclosure (3)
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COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23C-20 APPENDIX C j. The entire length of travel towards dive or left? Yes No k. At some intermediate point(s) while moving towards rise or right? Yes No (Indicate degrees of rise or right when heard): _______________________ l. At some intermediate point(s) while moving towards dive or left? Yes No (Indicate degrees of dive or left when heard): _______________________ 14. Is there any unusual hesitancy or motion during operation of the planes: a. Leaving the rise or right hardstop? Yes No b. Leaving the dive or left hardstop? Yes No c. At any other point(s) in the motion cycle? Yes No (1) If yes, describe giving direction of movement and degrees of rise, dive, left, or right when noise occurs:
15. Does ship's speed or depth have any effect on whether or not the noise is generated? Yes No a. If yes, describe:
16. Does ship's speed or depth have any effect on when the noise is detected during the movement cycle as described in question 13? Yes No a. If yes, describe:
17. Is the noise audible: a. Surfaced, underway? Yes No b. At periscope depth? Yes No c. Below periscope depth? Yes No 18. Does sea state affect the degree of noise? Yes No 19. Does simultaneous operation of the stern planes and rudder cause or increase the degree of noise? Yes No 20. Are any of the following components very warm to the touch while operating the control surface suspected of causing the noise? a. Hydraulic tail rod (if installed)? Yes No b. Hydraulic piston rod? Yes No c. Through hull connecting rod? Yes No 21. On the control surface suspected of causing the noise, perform the appropriate quarterly greasing MRC for the components listed in question 22. Operate the control surface while greasing (except the guide cylinder). Listen to determine if greasing causes any change in the occurrence or loudness of the noise. Greasing Performed?
Yes No 22. Did the noise diminish after greasing the following components? Fairwater or Bow Planes: a. Hull gland: Yes No (CONFIDENTIAL when filled in) Enclosure (3)
p. 874
COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23C-21 APPENDIX C b. Lower end of connecting rod: see Note 1 Yes No c. Upper end of connecting rod: see Note 1 Yes No d. Port stock bearing: Yes No e. Starboard stock bearing: Yes No Stern Planes: f. Hull gland: Yes No g. Forward end of connecting rod: see Note 1 Yes No h. Aft end of connecting rod: see Note 1 Yes No i. Port stock bearing: see Note 2 Yes No j. Starboard stock bearing: see Note 2 Yes No k. Port pintle bearing: Yes No l. Starboard pintle bearing: Yes No Rudder: m. Hull gland: Yes No n. Forward end of connecting rod: see Note 1 Yes No o. Aft end of connecting rod: see Note 1 Yes No p. Port stock bearing: see Note 2 Yes No q. Starboard stock bearing: see Note 2 Yes No r. Upper rudder stock bearing: see Note 2 Yes No s. Lower rudder stock bearing: see Note 2 Yes No t. Rudder carrier bearing (two fittings): see Note 2 Yes No 23. Pump one pound of grease into the guide cylinder grease fitting while the control surface is in the neutral position. Then operate the control surface about five cycles from full rise to full dive or left to right, as appropriate, while listening for the noise. Repeat this procedure for the guide cylinder until the specified amount of grease has been applied. Greasing Performed?
Yes No (CONFIDENTIAL when filled in) Enclosure (3)
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COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23C-22 APPENDIX C NOTE 1: GREASE UNDERWAY IF TH E APPROPRIATE ALTERATION IS INSTALLED TO PERMIT REMOTE GREASING OF THE STERN PLANES AND RUDDER CONNECTING RODS. THE FAIRWATER OR BOW PLANES CONNECTING ROD MAY BE GREASED LOCALLY WHILE UNDERWAY ON THE SURFACE EVEN IF REMOTE GREASING ALTERATION IS NOT INSTALLED. NOTE 2: IF THE STERN PLANES ARE SUSPECTED OF CAUSING THE NOISE AND THE NOISE DID NOT DIMINISH AFTER GREASING THE STERN PLANE COMPONENTS, GREASE THE RUDDER COMPONENTS. IF THE GREASING DID NOT HELP A SUSPECTED NOISY RUDDER, GREASE THE STERN PLANES. Deliver this questionnaire to: For COMSUBLANT units : Carderock Division Naval Surface Warfare Center 9500 MacArthur Blvd. West Bethesda, MD 20817-5700 Attn: Code 711 - Fleet Support Program Manager For: New London Units, data packages should be forwarded to: NSSC NEW LONDON CT, N42 For COMSUBPAC units: Naval Surface Warfare Center Carderock Division Bremerton Detachment 530 Farragut Ave Attn: Code 713 Bremerton, Washington 98314-5215 The NSWCCD will provide appropriate distribution to NAVSEA PMS 350, SEA 07T, PMS 392, TYCOM, and ISIC.
(CONFIDENTIAL when filled in) Enclosure (3)
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COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23D-1 APPENDIX D APPENDIX D PREDEPLOYMENT NOISE INSPECTION 1. Purpose. To provide requirements for Predeployment Noise Inspections. 2. Policy. This Appendix esta blishes the requirements for the Under Hull Sound Silencing Survey of all submarines. 3. Under Hull Sound Silencing Surveys. Under Hull Sound Silencing Surveys of submarines (using reference (g)) will be done at the following times: a. Prior to the ship leaving dry-dock. b. Waterborne Under Hull Inspection during the first week of a scheduled upkeep, normally accomplished by the inspecting facilities divers. c. Waterborne Under Hull Inspection prio r to deployments of 30 days or greater, normally accomplished by the inspecting facilities divers. 4. Reports. The Senior Hull Inspector of th e inspecting facility will conduct an inspection critique for the ship’s Noise Reduction Officer and ISIC Material Officer. Copies of the final survey report (a format is provided on the following page) or reference (g) data sheets will be supplied by the inspecting facility to the submarine and cognizant ISIC Material Officer.
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COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23D-2 APPENDIX D SOUND SILENCING SURVEY REPORT 1. Inspection performed by: Senior Inspector: ______ Inspector #1 ______ Inspector #2 ______ Inspector #3 ______ Inspector #4 ______ 2. The following deficiencies were noted:
3. Submitted by:
Senior Inspector
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COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23E-1 APPENDIX E APPENDIX E SUBMARINE SILENCING PUBLICATIONS X-Applicability PUBLICATION Note 1 688 726 21 774 AS PLATFORM NOISE S9073-A4-SNC-010/(C) USS LOS ANGELES (SSN 688) Class Acoustic Stealth Manual X X NSWCCD-71-TR-2001/020 February 2001 USS SEAWOLF (SSN 21) Class Acoustic Stealth Manual X S9073-AS-PNM-010/(C) Platform Noise Monitoring Analysis for Noise Reduction X S9073-AT-PNM-010/(C) Platform Noise Monitoring Analysis for Noise Reduction X X NAVSEA SE 394-NO-MMA-030/(C) AN/BSQ- 7 Platform Noise Manual X (TBD) Platform Noise Monitoring Analysis for Noise Reduction X(4) X(4) MACHINERY AND HULL VIBRATION S9073-AL-SBV-010/(C) Structureborne Noise Criteria for Auxiliary Machinery (U) Operation and Maintenance Instructions X X(4) X(4) X S9073-AM-SBV-010/(U) Structureborne Noise Acceptance Tests and Monitoring Program for Submarine Auxiliary Machinery (U) Volume I, Procedure (U) X X(4) X(4) X S9073-AM-SBV-020/(C) Structureborne Noise Acceptance Tests and Monitoring Program for Submarine Auxiliary Machinery (U) Volume II, Criteria X X(4) X(4) X SUBMARINE SONAR DOMES S9165-AC-HBK-010/(U) Submarine Sonar Dome Handbook; Description and Maintenance
X
X
X(4)
X(4)
X SE300-AY-MMA-010/(U) TRIDENT Glass Reinforced Plastic Bow Sonar Dome X
X SE300-AZ-MMA-010 Description, Operation and Maintenance SSN21 Class Sonar Bow Dome X SE300-MA-MMA-011 Glass Reinforced Plastic (GRP) Bow Sonar Dome X MISCELLANEOUS NAVSEA NOISE REDUCTION MANUALS S6360-AD-HBK-010 Special Hull Treatment, Maintenance and Repair for Submarines
X
X
X(4)
X(4)
X S9311-AM-MME-010/(U) Micro-balancing of Ship Service Turbine Generator Sets on SSN/SSBN Submarines X X X(4) X(4) X
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COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23E-2 APPENDIX E X-Applicability PUBLICATION Note 1 688 726 21 774 AS S9561-AQ-MMA-010/(U) Low Noise Electrohydraulic Flow Control Servo Valve Model SV-438-10P; Service Instructions
X S9073-AW-SNC-010/(U) Ship Acoustical Surveys for Submarines X X X X S9073-AF-SNC-010/(C) Ship Noise Control X X X(4) X(4) X S9SSB-X9-SSM-09A/(U) SSBN 726 Class Ship System Manual, Volume II, Part IV, Monitoring Subsystem Note 2 X X 0900-LP-060-2010(U) Electrical Machinery Repair Manual, Volume I, Electric Motor Repairs (Rev 2) X 0900-LP-060-2020(U) Electrical Machinery Repair Manual, Volume II, Vibration Analysis and Rotor Balance X S0600-AA-PRO-230(U) Underwater Ship Husbandry Manual, Chapter 23, Submarine Pre- Deployment Noise Inspection X X X(4) X(4) X MIPs FOR NOISE MONITORING Platform Noise Monitoring MIP SO-544/902 X SSGN Only X X TRIDENT Monitoring Subsystem 4190/911 (contains platform monitoring) X Topside and Housekeeping Surveys, reference (g) X X X(4) X(4) Isolation System Survey, Appropriate System MIPs Topside and Housekeeping Surveys MIP SO-591/901 X X Vibration Noise Monitoring MIP 4910/Series, See Note 3 (Machinery and Hull) X X X(4) X(4) NOISE CONTROL GUIDELINES 0900-LP-093-9010/(C) Noise Control Guide for SSBN 640 Class X Specifically Applicable Noise Road Maps (Selected Record Drawings) X X X X X TRIAL REPORTS NSWCCD or NSWCCD DET BREMERTON: Latest Detection & Detectability Report X X X X NSWCCD or NSWCCD DET BREMERTON: Latest Acoustical Trial Summary Report X X X X
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COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23E-3 APPENDIX E X-Applicability PUBLICATION Note 1 688 726 21 774 AS LETTERS AND INSTRUCTIONS NAVSEAINST C9073.2 (Series) Acoustical Surveys of Submarines (U) X X X X X COMUSFLTFORCOMINST 4790.3; Joint Fleet Maintenance Manual Volume VI, Chapter 23, Submarine Noise Reduction
X
X
X(4)
X(4)
X NAVSEA SILENCING FILMS 34547 DN Training Film - Submarine Sound Shorts
X 35350 DN Training Film - Noise Control Guidelines, Running Silent X 35050 DN Training Film - Shipboard Noise Isolation Devices X SAVPIN 803414 DN Sound Silencing Show (Video Tape) - consists of the three films listed. X SVT - ST - 9427 - Submarine Rattles X X X X X SVT - ST - 9429 - Submarine Sound Silencing (SSN 688) X X SVT - ST - 9430 - Submarine Sound Silencing (SSBN 726) X X SVT - ST - (TBD) - Submarine Sound Silencing (SSN 21) X X SVT - ST - (TBD) - Submarine Sound Silencing (SSN 774) X X NOTE 1: THE STOCKING OR ORDERING POINT FOR ALL PUBLICATIONS CAN BE FOUND USING TECHNICAL DATA INFORMATION MANAGEMENT SYSTEM (TDMIS) NOTE 2: THE ORDERING POINT FO R THE ITEM WITH THIS NOTE IS SUPERVISOR OF SHIPBUILDING GROTON NOTE 3: SPECIFIC MAINTENANCE RE QUIREMENTS FOR CONSIDERATION IN THIS LISTING ARE FOR: A. INSPECT, CLEAN & REPLACE SOUND WASHERS. B. RECORD MACHINERY VIBRATION LEVELS. C. RECORD HULL VIBRATION LEVELS. NOTE 4: APPLICABLE, BUT MAY NOT CONTAIN ALL APPLICABLE INFORMATION UNTIL UPDATED FOR SPECIFIC CLASS
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COMUSFLTFORCOMINST 4790.3 REV D 16 Oct 2019 VI-23F-1 APPENDIX F APPENDIX F SAMPLE PROPELLER CHANGEOUT MESSAGE FM COMSUBRON (AS APPROPRIATE)// TO COMNAVSEASYSCOM WASHINGTON DC// INFO COMSUBPAC PEARL HARBOR HI// COMSUBLANT NORFOLK VA// USS (SHIP'S NAME AND HULL NO.)// BT UNCLAS //N09245// MSGID/GENADMIN/COMSUBRON (AS APPROPRIATE)// SUBJ/(SUBS) PROPELLER CHANGEOUT// REF/A/DOC/COMUSFLTFORCOMINST 4790.3// NARR/REF A IS JOINT FLEET MAINTENANCE MANUAL/VOL VI, CH 23 PROVIDES GUIDANCE FOR MONITORING PROPELLER VIBRATION DATA AND PROPELLER CHANGE OUT// RMKS/1. IAW REF A, FOL PROPELLER DATA REPORTED A. SERIAL NO. OF PROPELLER REMOVED B. SERIAL NO. OF PROPELLER INSTALLED C. REASON PROPELLER REPLACED (POOR PERFORMANCE, EXCESSIV E CAVITATION, GOUGED/NICKED, SINGING SCREW, ETC.) 2. REQUEST DISPOSITION INSTRUCT IONS FOR REMOVED PROPELLER// BT NOTE: ENSURE MESSAGES ARE FOLLO WING CURRENT MESSAGE FORMAT AND CURRENT PLAIN LANGUAGE ADDRESS DIRECTORY (PLAD) IS UTILIZED.
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COMUSFLTFORCOMINST 4790.3 REV D CHG 3 07 Nov 2023 VI-24-1 VOLUME VI CHAPTER 24 PERIODIC MAINTENANCE REQUIREMENT PROGRAM REFERENCES. (a) NAVSEAINST 4790.8 - Ships’ Maintena nce and Material Management (3-M) Manual (b) NAVSUP Publication 485 - Afloat Supply Procedures (c) OPNAVINST 3120.33 - Submarine Engineer ed Operating Cycle (SEOC) Program (d) NAVSEA S9592-B3-MAN-010 - Dry Deck Sh elter Systems Scope of Certification Notebook LISTING OF APPENDICES. A Submarine Periodic Maintenance Re quirement (PMR) Management Process B Work Package Supplement - Shipyard Planning and Feedback Report C Work Package - Ship’s Syst em Work Description, Part 4.13 24.1 PURPOSE. This chapter defines the functions and responsibilities of the submarine Periodic Maintenance Requirements (PMR) Program, and applies to all submarines. Details of PMR documentation are described in Appendix E of reference (a). Unrestricted Operation (URO) PMR guidance is provided in Chapter 25 of this Volume. Hull Integrity Procedure PMR guidance is provided in Chapter 38 of this Volume. Accomplishment of all PMRs is mandatory. a. The submarine Class Maintenance Plan s (CMP) form the basis of a PMR Program which takes the place of the Integrated Maintenance and Modernization Planning Program for these classes and defines the planned, corrective and inactive equipment Maintenance Requirements for all levels of accomplishment. b. PMR work requires detailed planning and long lead-time material procurement; therefore, all PMR work has been assigned to the Fleet Maintenance Activity (FMA). Ship’s Force is not expected to be called upon for PMR work other than the normal responsibilities for establishing plant conditions, authorizing shipboard work, monitoring work in process, interference removal, delivery of ship to shop items, retesting and accepting work. Ship’s Force Work Center (WC) will not be assigned as Lead Work Center (LWC) for I-Level PMR work but may be assigned as an assist WC. 24.2 TYPE COMMANDER SCHEDULING SYSTEM. PMR program management has been assigned to Submarine Maintenance Engineering, Planning and Procurement Activity (SUBMEPP) who develops CMPs, Maintenance Requirement Cards (MRC), Maintenance Repair Standards (MRCs, Technical Repair Standards (TRS) and Submarine Maintenance Standards (SMS)), HIP and URO MRCs, and provides PMR configuration and scheduling information to the Submarine Force. These Inventories and Schedules aid in decisions