TM 5-4220-226-1 4&P5-5. Troubleshooting Procedures.Table 5-1. Direct Support TroubleshootingMALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION1. EMERGENCY AIR SUPPLY DRAINED WITHOUT USEa.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 FLOWa.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 INOPERATIVEa.Check for damaged seat assembly indicated when valve cannot be closed or when air freeflows 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 INOPERATIVEa.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
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