DOC AIRBUS | TSM A320FFailure of the Thrust Reverser on the Engine 2, Channel B
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 (14KS2)
· wiring from the thrust reverser inhibition relay (14KS2) to the thrust reverser HCU (4101KS)
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
Ref. AMM 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power
Ref. AMM 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External
Power
Ref. AMM 31-60-00-860-002 EIS Stop Procedure
Ref. AMM 71-13-00-010-010 Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
Ref. AMM 71-13-00-410-010 Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
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
3. Fault Confirmation
Subtask 78-30-00-860-122-A
A. Job Set-Up
(1) Energize the aircraft electrical circuits
Ref. AMM 24-41-00-861-002 .
(2) On the panel 50VU, release the ENG/FADEC GND PWR/2 pushbutton switch.
Subtask 78-30-00-710-230-A
B. Test
(1) On the panel 50VU, push the ENG/FADEC GND PWR/2 pushbutton switch and release it again.
NOTE: This action resets the FADEC memory.
(2) Do the operational test of the thrust reverser system with the CFDS (FADEC 2B) Ref.
AMM 78-31-00-710-041 .
4. Fault Isolation
Subtask 78-30-00-810-157-A
A. If the test gives the maintenance message CHB PERM SW/HCU/HC2:
· read the fault code shown on the FLIGHT DATA and GROUND DATA of the FADEC (2B) 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 2B 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:
· open the fan cowls 437AL and 438AR Ref. AMM 71-13-00-010-010 .
· do a check and repair the wiring from the EEC (4000KS) to the thrust reverser HCU (4101KS)
. pins J9/B, D, C to pins B/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
(14KS2)
. 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 (14KS2) to the thrust
reverser HCU (4101KS)
. pin B to pin B/4 Ref. ASM 73-25-16.
(d) If the fault continues:
· do a check and repair the wiring from the EEC (4000KS) to the thrust reverser HCU (4101KS)
. pins J7/C, k to pins B/7, 6 Ref. ASM 73-25-16.
Subtask 78-30-00-710-231-A
B. Do the test given in Para. 3.
5. Close-up
Subtask 78-30-00-860-123-A
A. Put the aircraft back to its initial configuration.
(1) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
Ref. AMM 31-60-00-860-002 .
(2) On the panel 50VU, push the ENG/FADEC GND PWR/2 pushbutton switch.
(3) De-energize the aircraft electrical circuits
Ref. AMM 24-41-00-862-002 .
(4) Close the fan cowls 447AL and 448AR Ref. AMM 71-13-00-410-010 . [Rev.6 from Feb 2017] 2026.04.04 04:38:10 UTC