DOC AIRBUS | TSM A320FFailure of the Thrust Reverser HCU on Engine 2
1. Possible Causes
· HCU-THRUST REV (4101KS)
· LOCK IND/PROX SENSOR-THRUST REV LOWER R ACTUATOR ( 4006KS )
· wiring from the EEC (4000KS) to the thrust reverser HCU2 (4101KS2)
· wiring from the EEC (4000KS) to the thrust reverser inhibition relay 2 (14KS2)
· wiring from the thrust reverser inhibition relay 2 (14KS2) to the thrust reverser HCU2 (4101KS2)
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
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 70-23-15-912-010 Connection of Electrical Connectors
Ref. AMM 71-13-00-410-010 Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
Ref. AMM 71-50-00-210-010 Wire Harness Visual Inspection - All Power Plant Electrical Cables
Ref. ASM 73-25-16
Ref. AMM 78-31-00-710-041 Operational Test of the Thrust Reverser System with the CFDS
Ref. AMM 78-31-15-000-010 Removal of the Lock Indicator Proximity Sensor
Ref. AMM 78-31-15-400-010 Installation of the Lock Indicator Proximity Sensor
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
Ref. AMM 78-32-00-410-010 Closing of the Thrust Reverser Halves
Thrust Reverser Control - Engine 2, Channel B SHEET 1
Figure 78(IAE)-30-00-991-01800-A / SHEET 1/1 - Thrust Reverser Control - Engine 2, Channel B not
printed, as per printing preferences
3. Fault Confirmation
Subtask 78-30-00-710-118-A
A. Test
(1) Do the operational test of the thrust reverser system with the CFDS (through FADEC 2A and 2B
menus) Ref. AMM 78-31-00-710-041 .
4. Fault Isolation
(Ref. Fig. Thrust Reverser Control - Engine 2, Channel B SHEET 1)
Subtask 78-30-00-810-093-A
A. If the test gives the maintenance message REV HCU/REV SL CHB/HC2:
· examine the harnesses Ref. AMM 71-50-00-210-010 :
. from the EEC (4000KS) to the thrust reverser HCU (4101KS)
. from the EEC (4000KS) to the thrust reverser inhibition relay 2 (14KS2)
. from the thrust reverser inhibition relay 2 (14KS2) to the thrust reverser HCU (4101KS)
Ref. ASM 73-25-16.
(1) If the fault continues:
· disconnect the connectors from the thrust reverser HCU (4101KS) and the thrust reverser inhibition
relay 2 (14KS2)
· examine the connectors and receptacles Ref. AMM 71-50-00-210-010
· connect the connectors to the thrust reverser HCU (4101KS) and the thrust reverser inhibition relay
2 (14KS2) Ref. AMM 70-23-15-912-010 .
(2) If the fault continues:
· replace the HCU-THRUST REV (4101KS) Ref. AMM 78-31-51-000-010 and Ref.
AMM 78-31-51-400-010 .
(3) If the fault continues:
· replace the LOCK IND/PROX SENSOR-THRUST REV LOWER R ACTUATOR ( 4006KS ) Ref.
AMM 78-31-15-000-010 and Ref. AMM 78-31-15-400-010 .
(4) If the fault continues:
· do a check and repair the:
. wiring from the EEC (4000KS) to the thrust reverser HCU2 (4101KS2) :
* pins J7/k, C to pins B/6, 7
* pins J9/D, C, B to pins B/3, 2, 5
. wiring from the EEC (4000KS) to the thrust reverser inhibition relay 2 (14KS2) :
pin J9/A to pin 4
. wiring from the thrust reverser inhibition relay 2 (14KS2) to the thrust reverser
HCU2 (4101KS2) : pin B to pin B/4
Ref. ASM 73-25-16.
Subtask 78-30-00-710-119-A
B. Do the test given in Para. 3.
5. Close-up
Subtask 78-30-00-860-075-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) Make sure that the thrust reverser halves 461AL and 462AR are closed Ref.
AMM 78-32-00-410-010 .
(5) Make sure that the fan cowls 447AL and 448AR are closed Ref. AMM 71-13-00-410-010 . [Rev.6 from Feb 2017] 2026.04.04 04:38:07 UTC