TM 5-4220-226-1 4&P
5-5. Troubleshooting Procedures.
Table 5-1. Direct Support Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. EMERGENCY AIR SUPPLY DRAINED WITHOUT USE
a.
Check for defective emergency air supply.
Replace defective air supply.
b.
Check for bent emergency air supply valve stem indicated by difficulty in turning valve handle.
Replace valve stem (para 5-8).
c.
Check valve stem.
Replace/repair valve (para 5-8).
2. ONE-WAY VALVE ALLOWS AIR BACK FLOW
a.
Check for damaged valve.
Replace valve (para 4-14).
b.
Check for foreign matter in valve.
Replace valve (para 4-14).
3. STEADY FLOW SUPPLY VALVE INOPERATIVE
a.
Check for damaged seat assembly indicated when valve cannot be closed or when air free
flows through air train.
Repair damaged valve seat (para 5-1 0).
b.
Check for bent valve stem indicated by difficulty in turning valve handle.
Replace defective valve stem (para 5-10).
4. MUFFLER/AIR TRAIN INOPERATIVE
a.
Check for defective steady flow valve indicated by free flow of air through air train.
Repair defective valve (para 5-1 0).
b.
Check for clogged or damaged muffler indicated by no air flow through air train.
Replace/repair defective muffler (para 5-11).
5-2
