Loss of the Thrust Reverser Indication on Engine 1 or 2

TASK 78-00-00-810-801-A
Loss of the Thrust Reverser Indication on Engine 1 or 2

1. Possible Causes

DMC-1 [1WT1]
LATCH-BLOCKER DOOR, UPPER R [3002KM1]
LATCH-BLOCKER DOOR, LOWER R [3002KM2]
LATCH-BLOCKER DOOR, LOWER L [3002KM3]
LATCH-BLOCKER DOOR, UPPER L [3002KM4]
lower blocker door
upper blocker door
ACTUATOR-BLOCKER DOOR, UPPER R [3001KM1]
ACTUATOR-BLOCKER DOOR, LOWER R [3001KM2]
ACTUATOR-BLOCKER DOOR, LOWER L [3001KM3]
ACTUATOR-BLOCKER DOOR, UPPER L [3001KM4]
HCU-THRUST REV (4101KS)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-63-34-000-001	Removal of the DMC
AMM 31-63-34-400-001	Installation of the DMC
AMM 78-31-00-710-040	Operational Test of the Thrust Reverser System
AMM 78-31-00-710-042	Operational Test of the Thrust Reverser System
AMM 78-31-19-000-001	Removal of the Blocker Door Latches
AMM 78-31-19-000-040	Removal of the Blocker Door Latches
AMM 78-31-19-400-001	Installation of the Blocker Door Latches
AMM 78-31-19-400-040	Installation of the Blocker Door Latches
AMM 78-31-41-000-001	Removal of the Blocker Door Hydraulic Actuator
AMM 78-31-41-000-040	Removal of the Blocker Door Hydraulic Actuators
AMM 78-31-41-400-001	Installation of the Blocker Door Hydraulic Actuator
AMM 78-31-41-400-040	Installation of the Blocker Door Hydraulic Actuators
AMM 78-31-51-000-040	Removal of the Hydraulic Control Unit
AMM 78-31-51-000-042	Removal of the Hydraulic Control Unit
AMM 78-31-51-400-040	Installation of the Hydraulic Control Unit
AMM 78-31-51-400-042	Installation of the Hydraulic Control Unit
AMM 78-32-41-000-001	Removal of the Lower Blocker Door
AMM 78-32-41-000-002	Removal of the Upper Blocker Door
AMM 78-32-41-000-040	Removal of the Lower Blocker Door
AMM 78-32-41-000-041	Removal of the Upper Blocker Door
AMM 78-32-41-400-001	Installation of the Lower Blocker Door
AMM 78-32-41-400-002	Installation of the Upper Blocker Door
AMM 78-32-41-400-040	Installation of the Lower Blocker Door
AMM 78-32-41-400-041	Installation of the Upper Blocker Door

3. Fault Confirmation
Subtask 78-00-00-710-050-A ** ON A/C NOT FOR ALL

A. Test
(1) Do a check to see if the REV indication is shown on the upper ECAM display unit with the DMC3 switched on.

4. Fault Isolation
Subtask 78-00-00-810-050-A ** ON A/C NOT FOR ALL

A. If the REV indication is present on the upper ECAM display with the DMC3 switched on:
(1) Replace the DMC-1 [1WT1] AMM 31-63-34-000-001 and AMM 31-63-34-400-001.

Subtask 78-00-00-810-055-A ** ON A/C NOT FOR ALL

B. If the REV indication is not present on the upper ECAM display unit with the DMC3 switched on:
(1) Do a check to make sure that the blocker door latches are correctly unlocked.
(a) If there are not correctly unlocked:

replace the defective: LATCH-BLOCKER DOOR, UPPER R [3002KM1] or LATCH-BLOCKER DOOR, LOWER R [3002KM2] or LATCH-BLOCKER DOOR, LOWER L [3002KM3] or LATCH-BLOCKER DOOR, UPPER L [3002KM4] AMM 78-31-19-000-040 and AMM 78-31-19-400-040.

(2) If the fault continues:

manually release the actuator to make sure that the blocker door or the hydraulic actuator operates correctly.

(a) If the blocker door does not operate correctly:

replace the defective lower blocker door AMM 78-32-41-000-040 AMM 78-32-41-400-040 or
replace the defective upper blocker door AMM 78-32-41-000-041 AMM 78-32-41-400-041.

(b) If the hydraulic actuator does not operate correctly:

replace the defective: ACTUATOR-BLOCKER DOOR, UPPER R [3001KM1] or ACTUATOR-BLOCKER DOOR, LOWER R [3001KM2] or ACTUATOR-BLOCKER DOOR, LOWER L [3001KM3] ACTUATOR-BLOCKER DOOR, UPPER L [3001KM4] AMM 78-31-41-000-040 AMM 78-31-41-400-040.

replace the HCU-THRUST REV (4101KS) AMM 78-31-51-000-040 and AMM 78-31-51-400-040.

Subtask 78-00-00-710-051-A ** ON A/C NOT FOR ALL

C. Do the operational test of the thrust reverser system AMM 78-31-00-710-040.

Subtask 78-00-00-810-055-B ** ON A/C NOT FOR ALL

D. If the REV indication is not present on the upper ECAM display unit with the DMC3 switched on:
(1) Do a check to make sure that the blocker door latches are correctly unlocked.
(a) If there are not correctly unlocked:

replace the defective: LATCH-BLOCKER DOOR, UPPER R [3002KM1] or LATCH-BLOCKER DOOR, LOWER R [3002KM2] or LATCH-BLOCKER DOOR, LOWER L [3002KM3] or LATCH-BLOCKER DOOR, UPPER L [3002KM4] AMM 78-31-19-000-001 and AMM 78-31-19-400-001.

(2) If the fault continues:

manually release the actuator to make sure that the blocker door or the hydraulic actuator operates correctly.

(a) If the blocker door does not operate correctly:

replace the defective lower blocker door AMM 78-32-41-000-001 AMM 78-32-41-400-001 or
replace the defective upper blocker door AMM 78-32-41-000-002 AMM 78-32-41-400-002.

(b) If the hydraulic actuator does not operate correctly:

replace the defective: ACTUATOR-BLOCKER DOOR, UPPER R [3001KM1] or ACTUATOR-BLOCKER DOOR, LOWER R [3001KM2] or ACTUATOR-BLOCKER DOOR, LOWER L [3001KM3] ACTUATOR-BLOCKER DOOR, UPPER L [3001KM4] AMM 78-31-41-000-001 AMM 78-31-41-400-001.

replace the HCU-THRUST REV (4101KS) AMM 78-31-51-000-042 and AMM 78-31-51-400-042.

Subtask 78-00-00-710-051-B ** ON A/C NOT FOR ALL

E. Do the operational test of the thrust reverser system AMM 78-31-00-710-042.

[Rev.8 from Aug 2018] 2026.04.04 04:37:58 UTC