TM 5-4220-227-14
Section V. UNIT MAINTENANCE PROCEDURES
Paragraph
Page
4-22
General ........................................................................................................................................4-21
4-23
Soap Test ....................................................................................................................................4-21
4-24
Depressurization Valve and Gage (Medical Lock) ........................................................................4-22
4-25
Pressurization Valve (Inner Lock Door) ........................................................................................4-24
4-26
Cot Assemblies (I/L) .....................................................................................................................4-26
4-27
Deck Plates ..................................................................................................................................4-28
4-28
Heater/Chiller Module ..................................................................................................................4-30
4-29
Pressure Relief Valve Assembly ..................................................................................................4-32
4-30
Water Valves (3/4 in.) ..................................................................................................................4-34
4-31
Hoses ...........................................................................................................................................4-38
4-32
Power Supply, 28V .......................................................................................................................4-40
4-33
Scrubber Assembly ......................................................................................................................4-42
4-34
Portable Oxygen Analyzer (POA) .................................................................................................4-44
4-35
Thermocouple Meter and Temperature Probe ..............................................................................4-46
4-36
Ground Fault Interrupter ...............................................................................................................4-48
4-37
Six Plug Receptacle Power Strip ..................................................................................................4-50
4-38
Double Light Power Supply (Inner Lock) .......................................................................................4-52
4-39
Light Source .................................................................................................................................4-56
4-40
Single Light Power Supply (Outer Lock) . ......................................................................................4-60
4-41
Fluorescent Light Assembly .........................................................................................................4-64
4-42
Wiring Harness .............................................................................................................................4-68
4-43
Communicator Assembly .............................................................................................................4-70
4-44
Battery Card and Case ..................................................................................................................4-72
4-45
Microphone ..................................................................................................................................4-74
4-46
Headset .......................................................................................................................................4-76
4-47
Sound Powered Phones and Brackets ..........................................................................................4-78
4-48
Speakers I/L and O/L ...................................................................................................................4-80
4-49
O2 K Bottles and Manifold ............................................................................................................4-82
4-50
Oxygen Inhalator Mask Assembly ................................................................................................4-84
4-22. General. This section contains unit level maintenance procedures as authorized by the maintenance allocation
chart in Appendix B of this manual.
4-23. Soap Test. Whenever replaced, all gages, valves, pipe fittings and similar components shall be tested for
leakage.
a.
Brush soapy water solution over joint or fitting.
b.
Apply normal operating pressure and inspect for soap bubbles.
c.
If soap bubbles appear, remove pressure and tighten joint or fitting.
d.
Retest with soapy water solution.
4-21
