Reverser Indication Flashes Amber on Engine 1

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1. Possible Causes
· HCU-THRUST REV (4101KS)
· wiring
· LOCK IND/PROX SENSOR-THRUST REV LOWER R ACTUATOR ( 4006KS )
· LOCK IND/PROX SENSOR-THRUST REV LOWER L ACTUATOR ( 4007KS )
· LVDT-THRUST REV UPPER R ACTUATOR ( 4003KS )
· LVDT-THRUST REV UPPER L ACTUATOR ( 4004KS )
2 Job Set-up Information
A. Referenced Information
REFERENCE DESIGNATION
Ref. ASM 73-25-16
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 78-32-43-000-010 Removal of the C-Duct Locking Actuator
Ref. AMM 78-32-43-400-010 Installation of the C-Duct Locking Actuator
Ref. AMM 78-32-48-000-010 Removal of the C-Duct Non-Locking Actuator
Ref. AMM 78-32-48-400-010 Installation of the C-Duct Non-Locking Actuator
3. Fault Confirmation
Subtask 78-30-00-710-098-A
A. Test
Not applicable.
4. Fault Isolation
Subtask 78-30-00-810-080-A
A. If there was the ENG1 REV SYS PRESSURIZED ECAM message:
· replace the HCU-THRUST REV (4101KS) Ref. AMM 78-31-51-000-010 and Ref.
AMM 78-31-51-400-010 .
Subtask 78-30-00-810-081-A
B. If there was not the ENG1 REV SYS PRESSURIZED ECAM message:
· do a check and repair:
. the wiring from the right lock indicator proximity sensor (4006KS) pin A to the first
derivation Ref. ASM 73-25-16
. the wiring from the left lock indicator proximity sensor (4007KS) pin A to the first derivation
Ref. ASM 73-25-16.
(1) If you find no fault:
· replace the LOCK IND/PROX SENSOR-THRUST REV LOWER R ACTUATOR ( 4006KS )
and the LOCK IND/PROX SENSOR-THRUST REV LOWER L ACTUATOR ( 4007KS ) Ref.
AMM 78-32-43-000-010 and Ref. AMM 78-32-43-400-010 .
(2) If the fault continues:
· replace the LVDT-THRUST REV UPPER R ACTUATOR ( 4003KS ) and the LVDTTHRUST
REV UPPER L ACTUATOR ( 4004KS ) Ref. AMM 78-32-48-000-010 and Ref.
AMM 78-32-48-400-010 . [Rev.6 from Feb 2017] 2026.04.04 04:38:07 UTC