DOC AIRBUS | TSM A320FDCV Failed Stowed
TASK 78-31-00-810-984-A
DCV Failed Stowed
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
3. Fault Confirmation
Subtask 78-31-00-710-299-A ** ON A/C NOT FOR ALL
Subtask 78-31-00-860-094-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:38:18 UTC
DCV Failed Stowed
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| TSM TASK 71-00-00-810-843-A | Nacelle Component and Harness Troubleshooting Procedure for Guidance Troubleshooting Intermittent Faults |
| AMM 71-13-00-010-802 | Opening of the Fan Cowl Doors |
| AMM 71-13-00-410-802 | Closing of the Fan Cowl Doors |
| AMM 73-21-01-000-801 | Removal of the Electronic Engine Control (EEC) |
| AMM 73-21-01-400-801 | Installation of the Electronic Engine Control (EEC) |
| AMM 78-31-00-710-805 | Operational Test of Thrust Reverser with MCDU |
| AMM 78-31-01-000-801 | Removal of the TRAS Hydraulic Control Unit (HCU) |
| AMM 78-31-01-400-801 | Installation of the TRAS Hydraulic Control Unit (HCU) |
| AMM 78-31-02-610-801 | Servicing of the TRAS Filter Module 4314KM1, 4314KM2 |
| AMM 78-31-50-000-801 | Removal of the TRAS Hydraulic Tubes and Hoses |
| AMM 78-31-50-400-801 | Installation of the TRAS Hydraulic Tubes and Hoses |
Subtask 78-31-00-710-299-A ** ON A/C NOT FOR ALL
A. Do the operational test of the thrust reverser with the MCDU to confirm this fault AMM 78-31-00-710-805.
(1) If the maintenance message does not come back, troubleshoot as described in the nacelle component and harness troubleshooting procedure for guidance troubleshooting intermittent faults (Ref. TSM TASK 71-00-00-810-843).
(a) Monitor the engine for reoccurring maintenance message.
(2) If the maintenance message comes back (hard fault), go to the Para. Fault Isolation.
4. Fault Isolation(1) If the maintenance message does not come back, troubleshoot as described in the nacelle component and harness troubleshooting procedure for guidance troubleshooting intermittent faults (Ref. TSM TASK 71-00-00-810-843).
(a) Monitor the engine for reoccurring maintenance message.
(2) If the maintenance message comes back (hard fault), go to the Para. Fault Isolation.
WARNING:
BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS WARNING, INJURY CAN OCCUR.
Subtask 78-31-00-810-328-A ** ON A/C NOT FOR ALL A. If there is confirmation of the fault:
(1) Check for hydraulic leakage on thrust reverser cowl.
(a) Open the fan cowl doors AMM 71-13-00-010-802.
(b) Inspect hydraulic tubes and hoses.
1 Replacetubes/hoses as necessary AMM 78-31-50-000-801 and AMM 78-31-50-400-801.
(c) If hydraulic leakage is corrected:
1 Do the test given in Para. 3.
(2) Check for hydraulic leakage in pylon.
(a) Get access to HCU:
1 Remove the access panel on the pylon to get access to the HCU:
a FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
b FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
(b) Inspect hydraulic tubes and hoses.
1 Replacetubes/hoses as necessary AMM 78-31-50-000-801 and AMM 78-31-50-400-801.
(c) If hydraulic leakage is corrected:
1 Do the test given in Para. 3.
(3) If the fault continues:
(a) Check for clogged TRAS filter (4314KM).
1 Check on filter module if red button is out.
2 If red button is out, replace filter element AMM 78-31-02-610-801.
3 Do the test given in Para. 3.
(4) If the fault continues:
(a) Replace HCU-T/R, ENG1 [4310EG1] or HCU-T/R, ENG2 [4310EG2] AMM 78-31-01-000-801 and AMM 78-31-01-400-801.
(b) Do the test given in Para. 3.
(5) If no problem found or fault continues:
(a) Replace
(b) Do the test given in Para. 3.
5. Close-up(1) Check for hydraulic leakage on thrust reverser cowl.
(a) Open the fan cowl doors AMM 71-13-00-010-802.
(b) Inspect hydraulic tubes and hoses.
1 Replace
(c) If hydraulic leakage is corrected:
1 Do the test given in Para. 3.
(2) Check for hydraulic leakage in pylon.
(a) Get access to HCU:
1 Remove the access panel on the pylon to get access to the HCU:
a FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
b FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
(b) Inspect hydraulic tubes and hoses.
1 Replace
(c) If hydraulic leakage is corrected:
1 Do the test given in Para. 3.
(3) If the fault continues:
(a) Check for clogged TRAS filter (4314KM).
1 Check on filter module if red button is out.
2 If red button is out, replace filter element AMM 78-31-02-610-801.
3 Do the test given in Para. 3.
(4) If the fault continues:
(a) Replace HCU-T/R, ENG1 [4310EG1] or HCU-T/R, ENG2 [4310EG2] AMM 78-31-01-000-801 and AMM 78-31-01-400-801.
(b) Do the test given in Para. 3.
(5) If no problem found or fault continues:
(a) Replace
(b) Do the test given in Para. 3.
Subtask 78-31-00-860-094-A ** ON A/C NOT FOR ALL
A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(a) Close the fan cowl doors AMM 71-13-00-410-802.
(b) Close the pylon access panel:
1 FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
2 FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
(1) Make sure that the work area is clean and clear of tools and other items.
(a) Close the fan cowl doors AMM 71-13-00-410-802.
(b) Close the pylon access panel:
1 FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
2 FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)