TM 5-4220-227-14Table 4-2. Unit Troubleshooting Procedures (Cont).MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION1.RECOMPRESSION CHAMBER INNER LOCK (I/L) FAILS TO PRESSURIZE (Cont).Step 4. Instruct tender to inspect the 02 BIBS manifold in both the I/L and O/L O2 masks may bemissing and O2 BIBS manifold connectors may not be plugged.Connect O2 masks to BIBS manifold or plug BIBS manifold connectors.Step 5. Instruct tender to inspect M/L inner door and door seal. An obstruction in doorway mayprevent the door from closing and forming a seal and the M/L pressurization valve may beopen.Instruct the tender to close the M/L pressurization valve and/or removeobstruction from M/L doorway holding closed until pressure build-up of .5 FSWin the inner lock forces the door to seal.Step 6. Check ELP-007 I/L primary and ELP-008 secondary air exhaust valves.These valves may be open or they are malfunctioning. Close I/L primary andsecondary valves. Replace malfunctioning valves.Step 7. Check ALP-002 primary and ALP-001 secondary chamber air manifold supply valves.Thesevalves may be closed or malfunctioning.Open primary and secondary chamber air manifold supply valves. These valvesmay be closed or malfunctioning.Step 8. Check AGA-003, the chamber manifold pressure gage. When the air supply manifold is fullypressurized and the gage is functioning properly, the gage should indicate 200 PSIGmaximum manifold pressure.If the gage indicates 0 PSIG manifold pressure proceed to next step. Replace theair supply manifold pressure gage if it is malfunctioning.Step 9. Refer to the appropriate technical manuals for the associated items of equipment to restorean adequate air supply to the air supply manifold. Then, pressurize the I/L locks to 40 PSIG(92 FSW) and leak test the chamber using a nonionic soap and soft bristle brush on allfittings, preformed packings, and joints.Report all leaks to GS Chamber air pressure should not drop lower than145 FSW (65 PSIG) after it has been pressurized to 1 65 FSW (73.4 PSIG) andheld for one hour.Step 10 Repeat steps 1 thru 9 to troubleshoot the O/L.4-15
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