DOC AIRBUS | TSM A320FFailure of the Thrust Reverser on Engine 1
1. Possible Causes
· HCU-THRUST REV (4101KS)
· wiring from the EEC (4000KS) to the thrust reverser HCU (4101KS)
· wiring from the EEC (4000KS) to the thrust reverser inhibition relay (14KS1)
· wiring from the thrust reverser inhibition relay (14KS1) to the thrust reverser HCU (4101KS)
· RELAY-THRUST REV INHIBITION, ENG 1 ( 14KS1 )
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
Ref. AMM 71-13-00-410-010 Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
Ref. AMM 73-22-00-710-040 Operational Test of the FADEC SYSTEM on the Ground
Ref. ASM 73-25-16
Ref. AMM 78-31-00-710-041 Operational Test of the Thrust Reverser System with the CFDS
Ref. AMM 78-31-51-000-010 Removal of the Thrust Reverser Hydraulic Control Unit
Ref. AMM 78-31-51-400-010 Installation of the Thrust Reverser Hydraulic Control Unit
Thrust Reverser (Engine 1) SHEET 1
Figure 78(IAE)-30-00-991-00500-A / SHEET 1/1 - Thrust Reverser (Engine 1) not printed, as per
printing preferences
3. Fault Confirmation
Subtask 78-30-00-710-258-A
A. FADEC Ground Test
(1) Do the CFDS Message Decoding and read the Scheduled Maintenance Report (Ref. 70-00-00 Page
Block 301 Task Supporting Data).
(2) If the readout gives one of the following fault codes in FADEC 1A or FADEC 1B (Fault Acronym:
DCVWAF):
· do the FADEC Ground Test Ref. AMM 73-22-00-710-040 for fault confirmation.
· continue with Fault Isolation Para 4.
(3) If the fault code readout in (1) does not give one of the above listed fault codes:
· continue with fault confirmation by Engine Ground Run Section 4.B below.
Subtask 78-30-00-710-066-A
B. Test
(1) Do the operational test of the thrust reverser system with the CFDS (FADEC 1A and 1B) Ref.
AMM 78-31-00-710-041 .
4. Fault Isolation
(Ref. Fig. Thrust Reverser (Engine 1) SHEET 1)
Subtask 78-30-00-810-058-A
A. If the test gives the maintenance message PERM SW/HCU/HC1:
· read the fault code shown on the FLIGHT DATA and GROUND DATA of the FADEC (1A and 1B) menu
on the MCDU (Ref. 70-00-00 Page Block 301 Task Supporting Data)
· make a record of the fault code.
(1) If the FADEC 1A menu gives the fault code DCVWAF:
· replace the HCU-THRUST REV (4101KS) Ref. AMM 78-31-51-000-010 and Ref.
AMM 78-31-51-400-010 .
(a) If the fault continues:
· do a check and repair the wiring from the EEC (4000KS) to the thrust reverser HCU (4101KS)
. pins J1/C, k to pins A/6, 7
. pins J3/B, D, G to pins A/5, 2, 3 Ref. ASM 73-25-16.
(b) If the fault continues:
· do a check and repair the wiring from the EEC (4000KS) to the thrust reverser inhibition relay
(14KS1)
. pin J3/A to pin 2 Ref. ASM 73-25-16.
(c) If the fault continues:
· do a check and repair the wiring from the thrust reverser inhibition relay (14KS1) to the thrust
reverser HCU (4101KS)
. pin A to pin A/4 Ref. ASM 73-25-16.
(2) If the FADEC 1B menu gives the fault code DCVWAF:
· replace the HCU-THRUST REV (4101KS) Ref. AMM 78-31-51-000-010 and Ref.
AMM 78-31-51-400-010 .
(a) If the fault continues:
· do a check and repair the wiring from the EEC (4000KS) to the thrust reverser HCU (4101KS)
. pins J9/B, D, G to pins B/5, 2, 3
. pins J7/C, k to pins B/6, 7 Ref. ASM 73-25-16.
(b) If the fault continues:
· do a check and repair the wiring from the EEC (4000KS) to the thrust reverser inhibition relay
(14KS1)
. pin J9/A to pin 4 Ref. ASM 73-25-16.
(c) If the fault continues:
· do a check and repair the wiring from the thrust reverser inhibition relay (14KS1) to the thrust
reverser HCU (4101KS)
. pin B to pin B/4 Ref. ASM 73-25-16.
(3) If the FADEC 1A menu gives the fault code ACPSFL:
· replace the RELAY-THRUST REV INHIBITION, ENG 1 ( 14KS1 ) .
(a) If the fault continues:
· do a check and repair the wiring from the EEC (4000KS) to the thrust reverser HCU (4101KS)
. pins J3/B, D, G to pins A/5, 2, 3
. pins J1/C, k to pins A/6, 7 Ref. ASM 73-25-16.
(b) If the fault continues:
· do a check and repair the wiring from the EEC (4000KS) to the thrust reverser inhibition relay
(14KS1)
. pin J3/A to pin 2 Ref. ASM 73-25-16.
(c) If the fault continues:
· do a check and repair the wiring from the thrust reverser inhibition relay (14KS1) to the thrust
reverser HCU (4101KS)
. pin A to pin A/4 Ref. ASM 73-25-16.
(4) If the FADEC 1B menu gives the fault code ACPSFL:
· replace the HCU-THRUST REV (4101KS) Ref. AMM 78-31-51-000-010 and Ref.
AMM 78-31-51-400-010 .
(a) If the fault continues:
· do a check and repair the wiring from the EEC (4000KS) to the thrust reverser HCU (4101KS)
. pins J9/B, D, G to pins B/5, 2, 3
. pins J7/C, k to pins B/6, 7 Ref. ASM 73-25-16.
(b) If the fault continues:
· do a check and repair the wiring from the EEC (4000KS) to the thrust reverser inhibition relay
(14KS1)
. pin J9/A to pin 4 Ref. ASM 73-25-16.
(c) If the fault continues:
· do a check and repair the wiring from the thrust reverser inhibition relay (14KS1) to the thrust
reverser HCU (4101KS)
. pin B to pin B/4 Ref. ASM 73-25-16.
Subtask 78-30-00-710-259-A
B. Repeat the fault confirmation as given in Para. 3 using the same method (FADEC Ground Test or Engine
Ground Run) as before and confirm fault elimination.
5. Close-up
Subtask 78-30-00-860-058-A
A. Make sure that the fan cowls 437AL and 438AR are closed Ref. AMM 71-13-00-410-010 . [Rev.6 from Feb 2017] 2026.04.04 04:38:06 UTC