Figure 1-1. MK12 Surface Supported Diving System (SSDS)CHAPTER 1 INTRODUCTION - TM-5-4220-225-14_10List of AbbreviationsSECTION II. EQUIPMENT DESCRIPTION AND DATAFigure 1-2. Location and Description of Major Components (Sheet 1 of 3)Figure 1-2. Location and Description of Major Components (Sheet 2 of 3)Figure 1-2. Location and Description of Major Components (Sheet 3 of 3)Equipment Data.System Flow. Open Circuit Figure 1-3. MK12 SSDS Open Circuit Flow PatternFigure 1-4. MK12 Helmet Assembly.TECHNICAL PRINCIPLES OF OPERATION -contFigure 1-5. Exhaust ValvesCHAPTER 2 OPERATING INSTRUCTIONS - TM-5-4220-225-14_22Figure 2-1. MK12 SSDS Helmet Assembly Controls and Indicators.SECTION II. OPERATOR PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)Purpose of PMCS TableTable 2-1. Operator Preventive Maintenance Checks and ServicesOperator Preventive Maintenance Checks and Services (Cont) - TM-5-4220-225-14_27Operator Preventive Maintenance Checks and Services (Cont) - TM-5-4220-225-14_28Operator Preventive Maintenance Checks and Services (Cont) - TM-5-4220-225-14_29Operator Preventive Maintenance Checks and Services (Cont) - TM-5-4220-225-14_30Operator Preventive Maintenance Checks and Services (Cont) - TM-5-4220-225-14_31Operator Preventive Maintenance Checks and Services (Cont) - TM-5-4220-225-14_32Operator Preventive Maintenance Checks and Services (Cont) - TM-5-4220-225-14_33Operator Preventive Maintenance Checks and Services (Cont) - TM-5-4220-225-14_34Operator Preventive Maintenance Checks and Services (Cont) - TM-5-4220-225-14_35Operator Preventive Maintenance Checks and Services (Cont) - TM-5-4220-225-14_36Figure 2-2. Vacuum Test, One Way ValveTest Procedures -contFigure 2-3. Helmet P/Flow and Leak TestHelmet P/Flow and Leak Test -contRelief Valve TestFigure 2-4. Relief Valve TestDrysuit Leak Test Figure 2-5. Drysuit Leak TestCommunications CheckFigure 2-6. Communications CheckSECTION III. OPERATION UNDER USUAL CONDITIONS - TM-5-4220-225-14_47Table 2-2. Mission Predive Setup Procedure. Mission Predive Setup Procedure (Cont) - TM-5-4220-225-14_49 Mission Predive Setup Procedure (Cont) - TM-5-4220-225-14_50 Mission Predive Setup Procedure (Cont) - TM-5-4220-225-14_51Table 2-3. Daily Predive ProceduresDaily Predive Procedures (Cont) - TM-5-4220-225-14_53Daily Predive Procedures (Cont) - TM-5-4220-225-14_54Daily Predive Procedures (Cont) - TM-5-4220-225-14_55Daily Predive Procedures (Cont) - TM-5-4220-225-14_56Daily Predive Procedures (Cont) - TM-5-4220-225-14_57Table 2-4. Donning ProceduresDonning Procedures (Cont) - TM-5-4220-225-14_59Donning Procedures (Cont) - TM-5-4220-225-14_60Figure 2-7. Helmet PlacementFigure 2-8. Helmet Locking PinFigure 2-9. Flowmeter Readings for Controlled Overbottom Pressure.Overbottom Pressure Requirements.Figure 2-10. Manifold Pressure RequirementsFigure 2-11. Flowmeter Readings for 6 ACFM with Constant Manifold Pressure.Figure 2-12. Flowmeter Readings for 4 ACFM with Constant Manifold Pressure.Figure 2-13. Flowmeter Readings for2 ACFM with Constant Manifold PressureTable 2-5. Doffing ProceduresTable 2-6. Doffing ProceduresPostdrive ProceduresTable 2-7. Postdive Procedures (Cont)Postdive Procedures (Cont) - TM-5-4220-225-14_73Postdive Procedures (Cont) - TM-5-4220-225-14_74Figure 2-14. Divers Intercommunication Set.SECTION IV. OPERATION UNDER UNUSUAL CONDITIONSHelmet Locking Device FailureCHAPTER 3 OPERATOR MAINTENANCETable 3-1. Operator Troubleshooting Procedures.CHAPTER 4 UNIT MAINTENANCEInitial InspectionSECTION IV. UNIT TROUBLESHOOTINGTable 4-1. Unit Troubleshooting ProceduresUnit Troubleshooting Procedures (Cont)Unit Troubleshooting Procedures (Cont). - TM-5-4220-225-14_85Unit Troubleshooting Procedures (Cont). - TM-5-4220-225-14_86Unit Troubleshooting Procedures (Cont). - TM-5-4220-225-14_87Unit Troubleshooting Procedures (Cont). - TM-5-4220-225-14_88Unit Troubleshooting Procedures (Cont). - TM-5-4220-225-14_89Unit Troubleshooting Procedures (Cont). - TM-5-4220-225-14_90Unit Troubleshooting Procedures (Cont). - TM-5-4220-225-14_91General. - TM-5-4220-225-14_92Diver's CoverallsFigure 4-1. Outer Garment, RepairDiver's Drysuit.Figure 4-2. Seam, RepairNeckpiece.Figure 4-3. Abrasion, RepairBootsFigure 4-4. Straps, RepairFigure 4-5. Loop, RepairFigure 4-6. Buckle, Repair.Diver's Mittens.Figure 4-7. Diver's Mitten, Repair.Diver's Harness.Figure 4-9. Hardware, ReplaceHelmet Base Breech RingFigure 4-10. Helmet Base Breech Ring, ReplaceLower Breech Ring Assembly.Figure 4-11. Lower Breech Ring Assembly, ReplaceAir Supply AdapterFigure 4-12. Air Supply Adapter Assembly, ReplaceAir Supply Adapter -contAir Supply TubeFigure 4-13. Air Supply Tube, ReplaceAir Supply Tube -contAir Supply Valve - TM-5-4220-225-14_117Figure 4-14. Air Supply Valve, Replace.Air Supply Valve -cont - TM-5-4220-225-14_119Diffuser Assembly - TM-5-4220-225-14_120Figure 4-15. Diffuser Assembly, ReplaceAdjustable Exhaust ValveFigure 4-16. Adjustable Exhaust Valve, ReplaceAdjustable Exhaust Valve (Cont)Figure 4-17. Adjustable Exhaust Valve, RepairAdjustable Exhaust Valve -contAmbient Exhaust ValveFigure 4-18. Ambient Exhaust Valve, ReplaceAmbient Exhaust Valve (Cont)Figure 4-19. Ambient Exhaust Valve, RepairHelmet LugFigure 4-20. Helmet Lug, ReplaceHelmet Lug (Cont) - TM-5-4220-225-14_133Figure 4-21. Quick Release Pin, ReplaceHelmet Lug (Cont) - TM-5-4220-225-14_135Figure 4-23. Safety Pin, ReplaceHelmet CommunicationsFigure 4-24. Helmet Assembly SchematicHelmet Communications (Cont) - TM-5-4220-225-14_139Figure 4-25. Helmet Communications Assembly, DisassembleHelmet Communications (Cont) - TM-5-4220-225-14_141Figure 4-26. Helmet Communications Assembly, Assemble.Helmet Communications (Cont) - TM-5-4220-225-14_143Figure 4-27. Microphone, ReplaceHelmet Communications (Cont) - TM-5-4220-225-14_145Figure 4-28. Speaker, ReplaceCommunications Whip - TM-5-4220-225-14_147Figure 4-29. Communications Whip, TestHelmet LinerFigure 4-30. Helmet Liner, ReplaceHelmet DuctsFigure 4-31. Supply Duct, ReplaceHelmet Ducts (Cont)Figure 4-32. Return Duct, ReplaceAir Supply Whip.Figure 4-33. Air Supply Whip, ServiceAir Supply Whip (Cont)Figure 4-34. Air Supply Whip, ReplaceUmbilical.Figure 4-35. Diver End Umbilical, ReplaceUmbilical (Cont) - TM-5-4220-225-14_161Figure 4-36. Surface End Umbilical, ReplaceCommunications BoxFigure 4-37. Communications Station, ReplaceSECTION VI. PREPARATION FOR STORAGE OR SHIPMENT - TM-5-4220-225-14_165SECTION VII. UNIT LEVEL CLEANING PROCEDURE FOR DIVING LIFE SUPPORT AIR SYSTEMSPre-Cleaning of Components or Piping - TM-5-4220-225-14_167Cleaning Method - Non-Ionic DetergentCleaning Method Table 4-3. TSP Cleaning Solution Volume.Table 4-4. Cleaning Solution Flow Rate.Table 4-5. Cleaning Agents Comparable with Soft Goods.Table 4-5. Cleaning Agents Comparable with Soft Goods (Cont)Documentation and Record Keeping - TM-5-4220-225-14_174CHAPTER 5 DIRECT SUPPORT MAINTENANCEDirect Support Troubleshooting ProceduresTable 5-1. Direct Support Troubleshooting Procedures (Cont) - TM-5-4220-225-14_177Table 5-1. Direct Support Troubleshooting Procedures (Cont) - TM-5-4220-225-14_178SECTION III. DIRECT SUPPORT MAINTENANCE INSTRUCTIONSLower Breech RingFigure 5-1. Lower Lug, ReplaceLower Breech Ring (Cont) - TM-5-4220-225-14_182Figure 5-3. Lower Breech Ring Retainer, ReplaceLower Breech Ring (Cont) - TM-5-4220-225-14_184Figure 5-4. Neck Dam, ReplaceViewport AssembliesFigure 5-5. Front Viewport, ReplaceViewport Assemblies (Cont) - TM-5-4220-225-14_188Figure 5-6. Side Viewport, ReplaceViewport Assemblies (Cont) - TM-5-4220-225-14_190Figure 5-7. Top Viewport, ReplaceAir Supply Adapter.Figure 5-8. Air Supply Adapter, RepairAir Supply Valve - TM-5-4220-225-14_194Figure 5-9. Air Supply Valve, RepairAir Supply Valve -cont - TM-5-4220-225-14_196Diffuser Assembly - TM-5-4220-225-14_197Figure 5-10. Air Diffuser Assembly, RepairCommunications Whip - TM-5-4220-225-14_199Figure 5-11. Communications Whip, ReplaceHelmet Shell.Figure 5-12. Helmet Shell, ReplaceCommunications Box.Figure 5-13. Transformer/Heat Sink Assembly, ReplaceCommunications Box (Cont) - TM-5-4220-225-14_205Figure 5-15. Control Knob, ReplaceCommunications Box (Cont) - TM-5-4220-225-14_207Figure 5-16. Printed Circuit Assembly Layout.Figure 5-17. Interior Front Panel View.Figure 5-18. System Electrical SchematicCommunications Box (Cont) - TM-5-4220-225-14_211Replace audio amplifier assemblyCHAPTER 6 GENERAL SUPPORT MAINTENANCEUmbilicalAir hose burst test.Air hose coupling pull test.Pneumofathometer hose pressure and leak test.Umbilical (Cont). - TM-5-4220-225-14_218Figure 6-1. Air Supply Hose, FabricationPneumofathometer hose. Figure 6-2. Pneumofathometer Hose, FabricationCommunications/strength cable.Figure 6-3. Communications Cable, Fabrication (Sheet 1 of 6)Umbilical (Cont) - TM-5-4220-225-14_224Figure 6-3. Communications Cable, Fabrication (Sheet 2 of 6)Umbilical (Cont). - TM-5-4220-225-14_226Figure 6-3. Communications Cable, Fabrication (Sheet 3 of 6)Umbilical (Cont) - TM-5-4220-225-14_228Figure 6-3. Communications Cable, Fabrication (Sheet 4 of 6)Umbilical (Cont) - TM-5-4220-225-14_230Figure 6-3. Communications Cable, Fabrication (Sheet 5 of 6)Umbilical (Cont) - TM-5-4220-225-14_232Figure 6-3. Communications Cable, Fabrication (Sheet 6 of 6)Communications/strength cable splice.Figure 6-4. Communications/Strength Cable, Splice.Umbilical (Cont). - TM-5-4220-225-14_236Figure 6-5. Marline Wrap of UmbilicalAssemble marline wrap. -contUmbilical (Cont) - TM-5-4220-225-14_239Figure 6-6. Tape Wrap of Umbilical.APPENDIX A REFERENCES - TM-5-4220-225-14_241APPENDIX B MAINTENANCE ALLOCATIONColumn EntriesTool and Test Equipment Requirements (Sect. III and IV)SECTION II. MAINTENANCE ALLOCATION CHART FOR MK12 SURFACE SUPPORTED DIVING SYSTEMMAINTENANCE ALLOCATION CHART FOR MK12 SURFACE SUPPORTED DIVING SYSTEM -cont - TM-5-4220-225-14_246MAINTENANCE ALLOCATION CHART FOR MK12 SURFACE SUPPORTED DIVING SYSTEM -cont - TM-5-4220-225-14_247MAINTENANCE ALLOCATION CHART FOR MK12 SURFACE SUPPORTED DIVING SYSTEM -cont - TM-5-4220-225-14_248SECTION III. TOOL AND TEST EQUIPMENT REQUIREMENTS FOR MK12 SURFACE SUPPORTED DIVING SYSTEMTOOL AND TEST EQUIPMENT REQUIREMENTS FOR MK12 SURFACE SUPPORTED DIVING SYSTEM -cont - TM-5-4220-225-14_250TOOL AND TEST EQUIPMENT REQUIREMENTS FOR MK12 SURFACE SUPPORTED DIVING SYSTEM -cont - TM-5-4220-225-14_251TOOL AND TEST EQUIPMENT REQUIREMENTS FOR MK12 SURFACE SUPPORTED DIVING SYSTEM -cont - TM-5-4220-225-14_252APPENDIX C COMPONENTS OF END ITEM AND BASIC ISSUE ITEMS LISTSSECTION II. COMPONENTS OF END ITEMSCOMPONENTS OF END ITEMS -cont - TM-5-4220-225-14_255COMPONENTS OF END ITEMS -cont - TM-5-4220-225-14_256Description Usable FSCM and Part NumberDescription Usable FSCM and Part Number - TM-5-4220-225-14_258SECTION III. BASIC ISSUE ITEMSDescription Usable FSCM and Part Number - TM-5-4220-225-14_260APPENDIX D ADDITIONAL AUTHORIZATION LISTADDITIONAL AUTHORIZATION LIST (Cont) - TM-5-4220-225-14_262ADDITIONAL AUTHORIZATION LIST (Cont) - TM-5-4220-225-14_263APPENDIX E EXPENDABLE SUPPLIES AND MATERIALS LISTSECTION II. EXPENDABLE SUPPLIES AND MATERIALS LIST EXPENDABLE SUPPLIES AND MATERIALS LIST -contINDEX - TM-5-4220-225-14_267INDEX (Cont) - TM-5-4220-225-14_268INDEX (Cont) - TM-5-4220-225-14_269INDEX (Cont) - TM-5-4220-225-14_270The Metric System and Equivalents - TM-5-4220-225-14_273