CHAPTER 1 INTRODUCTION AND GENERAL INFORMATION
Figure 1-1. SPH-4B Helmet
1-2. Location and Description of Major Components
Figure 1-3. SPH-4B Retention and Earcup Assemblies - TM-1-8415-215-12P_13
Figure 1-3. SPH-4B Retention and Earcup Assemblies - TM-1-8415-215-12P_14
1-3. Differences Between Models
CHAPTER 2 OPERATING INSTRUCTIONS - TM-1-8415-215-12P_16
Figure 2-2. Earcup Within Retention Assembly
Figure 2-5. Boom and Headset-Microphone
Section II. OPERATION UNDER USUAL CONDITIONS
2-4. Operation of Standard Components.
Figure 2-9. Nape Strap Adjustment
Figure 2-11. Raising/Lowering Visors
Figure 2-12. Spacer Pad Applications
2-5. Operation of Auxiliary Equipment.
Section III. OPERATOR'S PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)
Table 2-1. Operator's Preventive Maintenance Checks and Services - TM-1-8415-215-12P_26
Operator's Preventive Maintenance Checks and Services (Continued).
Operator's Preventive Maintenance Checks and Services (Continued)
Section IV. TROUBLESHOOTING
Table 2-2. Operators' Troubleshooting
CHAPTER 3 MAINTENANCE INSTRUCTIONS - TM-1-8415-215-12P_31
3-3. Basic Fitting Procedure
3-3.1. Thermo Plastic Liner Custom Fitting Instructions
Hot plastic layers
Pressure on top of helmet
Section II. PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) - TM-1-8415-215-12P_36
Table 3-1. AVUM Preventive Maintenance Checks and Services (Continued)
AVUM Preventive Maintenance Checks and Services (Continued)
Symptom Index
Table 3-2. AVUM Maintenance Troubleshooting Chart
AVUM Maintenance Troubleshooting Chart (Continued) - TM-1-8415-215-12P_41
AVUM Maintenance Troubleshooting Chart (Continued) - TM-1-8415-215-12P_42
Section IV. CLEANING
Section V. AVIATION UNIT MAINTENANCE PROCEDURES
3-5. Energy-Absorbing Liner and Thermoplastic Liner.
Figure 3-2. Liner Removal/Installation
3-6. Thermoplastic Liner.
3-7. Retention Assembly.
Figure 3-4. Retention Assembly Attachment Points
Figure 3-5. Trimming Hanger Tab
3-8. Earcups and Earphones.
Figure 3-7. Removal of Earcup
Installation - TM-1-8415-215-12P_53
Figure 3-8. Replacement Earcups Installed
Figure 3-9. Spacer Pad Applications
3-10. Microphone/Boom/Swivel Assembly.
3-11. Communications Cord
Installation - TM-1-8415-215-12P_58
3-12. Dual Visor Assembly - TM-1-8415-215-12P_59
3-12. Dual Visor Assembly - TM-1-8415-215-12P_60
1. On right side (as worn) of visor housing
7. Remove right or left front screw
3-13. Outer Visor Lock.
3-14. Inner Visor Knob.
3-15. ANVIS Mount Installation.
3-16. ANVIS Goggles (attachment).
3-17. Cross Straps
3-18. Chafing Pad
3-19. Edge Beading
3-20. Touch-up Painting.
APPENDIX A REFERENCES - TM-1-8415-215-12P_71
APPENDIX B MAINTENANCE ALLOCATION CHART - TM-1-8415-215-12P_72
B-3. Explanation of Columns in the MAC
B-4. Explanation of Columns in Tool and Test Equipment Requirements
Section II. MAINTENANCE ALLOCATION CHART - TM-1-8415-215-12P_75
MAINTENANCE ALLOCATION CHART (Continued)
Section lIl. SPECIAL TOOL AND TEST EQUIPMENT REQUIREMENTS
Section IV. REMARKS - TM-1-8415-215-12P_78
Figure B-1. Special Tool, Modified Screwdriver - TM-1-8415-215-12P_79
APPENDIX C REPAIR PARTS AND SPECIAL TOOLS LIST - TM-1-8415-215-12P_80
b. SMR CODE
GROUP 02. DUAL VISOR ASSEMBLY
Figure C-3. Thermoplastic Liner Assembly - TM-1-8415-215-12P_83
(2) Maintenance Code
Limited repair
(3) Recoverability Code.
4. Explanation of Columns
5. Special Information
6. How to Locate Repair Parts.
Figure C-1. SPH-4B Helmet Assembly
Section II. REPAIR PARTS AND SPECIAL TOOLS LIST
Figure C-2. Dual Visor Assembly
Figure C-3. Thermoplastic Liner Assembly - TM-1-8415-215-12P_94
Figure C-4. Retention Assembly (Sheet 1 of 2)
Figure C-4. Retention Assembly (Sheet 2 of 2)
Figure C4. Retention Assembly
Figure C-5. Earcup Assembly - TM-1-8415-215-12P_98
Figure C-5. Earcup Assembly - TM-1-8415-215-12P_99
Section IV. NATIONAL STOCK NUMBER AND PART NUMBER INDEX - TM-1-8415-215-12P_100
PART NUMBER INDEX - TM-1-8415-215-12P_101
APPENDIX D EXPENDABLE SUPPLIES AND MATERIALS LIST - TM-1-8415-215-12P_102
Section II. EXPENDABLE SUPPLIES AND MATERIALS LIST - TM-1-8415-215-12P_103
Figure 1-1. SPH-4B Helmet
1-2. Location and Description of Major Components
Figure 1-3. SPH-4B Retention and Earcup Assemblies - TM-1-8415-215-12P_13
Figure 1-3. SPH-4B Retention and Earcup Assemblies - TM-1-8415-215-12P_14
1-3. Differences Between Models
CHAPTER 2 OPERATING INSTRUCTIONS - TM-1-8415-215-12P_16
Figure 2-2. Earcup Within Retention Assembly
Figure 2-5. Boom and Headset-Microphone
Section II. OPERATION UNDER USUAL CONDITIONS
2-4. Operation of Standard Components.
Figure 2-9. Nape Strap Adjustment
Figure 2-11. Raising/Lowering Visors
Figure 2-12. Spacer Pad Applications
2-5. Operation of Auxiliary Equipment.
Section III. OPERATOR'S PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)
Table 2-1. Operator's Preventive Maintenance Checks and Services - TM-1-8415-215-12P_26
Operator's Preventive Maintenance Checks and Services (Continued).
Operator's Preventive Maintenance Checks and Services (Continued)
Section IV. TROUBLESHOOTING
Table 2-2. Operators' Troubleshooting
CHAPTER 3 MAINTENANCE INSTRUCTIONS - TM-1-8415-215-12P_31
3-3. Basic Fitting Procedure
3-3.1. Thermo Plastic Liner Custom Fitting Instructions
Hot plastic layers
Pressure on top of helmet
Section II. PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) - TM-1-8415-215-12P_36
Table 3-1. AVUM Preventive Maintenance Checks and Services (Continued)
AVUM Preventive Maintenance Checks and Services (Continued)
Symptom Index
Table 3-2. AVUM Maintenance Troubleshooting Chart
AVUM Maintenance Troubleshooting Chart (Continued) - TM-1-8415-215-12P_41
AVUM Maintenance Troubleshooting Chart (Continued) - TM-1-8415-215-12P_42
Section IV. CLEANING
Section V. AVIATION UNIT MAINTENANCE PROCEDURES
3-5. Energy-Absorbing Liner and Thermoplastic Liner.
Figure 3-2. Liner Removal/Installation
3-6. Thermoplastic Liner.
3-7. Retention Assembly.
Figure 3-4. Retention Assembly Attachment Points
Figure 3-5. Trimming Hanger Tab
3-8. Earcups and Earphones.
Figure 3-7. Removal of Earcup
Installation - TM-1-8415-215-12P_53
Figure 3-8. Replacement Earcups Installed
Figure 3-9. Spacer Pad Applications
3-10. Microphone/Boom/Swivel Assembly.
3-11. Communications Cord
Installation - TM-1-8415-215-12P_58
3-12. Dual Visor Assembly - TM-1-8415-215-12P_59
3-12. Dual Visor Assembly - TM-1-8415-215-12P_60
1. On right side (as worn) of visor housing
7. Remove right or left front screw
3-13. Outer Visor Lock.
3-14. Inner Visor Knob.
3-15. ANVIS Mount Installation.
3-16. ANVIS Goggles (attachment).
3-17. Cross Straps
3-18. Chafing Pad
3-19. Edge Beading
3-20. Touch-up Painting.
APPENDIX A REFERENCES - TM-1-8415-215-12P_71
APPENDIX B MAINTENANCE ALLOCATION CHART - TM-1-8415-215-12P_72
B-3. Explanation of Columns in the MAC
B-4. Explanation of Columns in Tool and Test Equipment Requirements
Section II. MAINTENANCE ALLOCATION CHART - TM-1-8415-215-12P_75
MAINTENANCE ALLOCATION CHART (Continued)
Section lIl. SPECIAL TOOL AND TEST EQUIPMENT REQUIREMENTS
Section IV. REMARKS - TM-1-8415-215-12P_78
Figure B-1. Special Tool, Modified Screwdriver - TM-1-8415-215-12P_79
APPENDIX C REPAIR PARTS AND SPECIAL TOOLS LIST - TM-1-8415-215-12P_80
b. SMR CODE
GROUP 02. DUAL VISOR ASSEMBLY
Figure C-3. Thermoplastic Liner Assembly - TM-1-8415-215-12P_83
(2) Maintenance Code
Limited repair
(3) Recoverability Code.
4. Explanation of Columns
5. Special Information
6. How to Locate Repair Parts.
Figure C-1. SPH-4B Helmet Assembly
Section II. REPAIR PARTS AND SPECIAL TOOLS LIST
Figure C-2. Dual Visor Assembly
Figure C-3. Thermoplastic Liner Assembly - TM-1-8415-215-12P_94
Figure C-4. Retention Assembly (Sheet 1 of 2)
Figure C-4. Retention Assembly (Sheet 2 of 2)
Figure C4. Retention Assembly
Figure C-5. Earcup Assembly - TM-1-8415-215-12P_98
Figure C-5. Earcup Assembly - TM-1-8415-215-12P_99
Section IV. NATIONAL STOCK NUMBER AND PART NUMBER INDEX - TM-1-8415-215-12P_100
PART NUMBER INDEX - TM-1-8415-215-12P_101
APPENDIX D EXPENDABLE SUPPLIES AND MATERIALS LIST - TM-1-8415-215-12P_102
Section II. EXPENDABLE SUPPLIES AND MATERIALS LIST - TM-1-8415-215-12P_103
