TM5-4220-231-14&PTROUBLESHOOTING- (Con't)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION3. DACC SECONDARY AIR SUPPLY SIDE MALFUNCTIONS.Step 1. Ensure HP air is reaching the DACC by opening HP supply valve on DASS.Step 2. Open secondary side HP inlet valve on DACC, and observe the HP IN gage reading on thesecondary air supply side of the DACC. The gage should read the same as the HP gage onthe DASS. If not, check the HP IN Gage Isolation valve for the Secondary HP Supply sideof the DACC.Open isolation valve.If HP IN gage on the DACC Secondary HP supply side still does not register the samepressure as the HP gage on the DASS, the secondary side HP IN gage on the DACC isfaulty.Replace HP IN gage.If the HP IN gage indicates normal operating pressure, go to Step 3.Step 3. Open regulator 1/4 turn, and read LP OUT gage on Secondary side of DACC. Checksecondary HP Supply side LP OUT Gage Isolation valve on DACC.Open isolation valve.If LP OUT gage does not indicate normal operating pressure, either the regulator is faultyor the LP OUT gage is faulty.Go to Step 4.Step 4. To test Secondary HP Supply side LP OUT gage on the DACC, open LP OUT valve and readLP pressure gage on VTA panel.If LP gage on the VTA panel indicates pressure, but LP OUT gage on the Secondary HPSupply side of the DACC still indicates no pressure, LP OUT gage on DACC is faulty.Replace LP OUT gage.If gage on VTA does not indicate pressure, the regulator on DACC is faulty.Request intermediate direct support.If LP gage indicates normal operating pressure, go to Step 5.Step 5. Open LP OUT valve on the DACC Secondary HP Supply side.3-12
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