DOC AIRBUS | AMM A320FDeactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance [IAE]
TASK 78-30-00-040-012-A
Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
This deactivation task is not related to an AFM-CDL/MMEL item.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 78-30-00-941-057-A ** ON A/C NOT FOR ALL
Subtask 78-30-00-040-054-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 03:27:13 UTC
Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
WARNING:
DO NOT CAUSE A BLOCKAGE OF THE HYDRAULIC CONTROL UNIT (HCU) RETURN PORT TO DEACTIVATE THE HCU. IF YOU CAUSE A BLOCKAGE OF THE HCU RETURN PORT THE THRUST REVERSER CAN OPERATE ACCIDENTLY AND CAUSE INJURY OR DAMAGE.
WARNING:
BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.
1. Reason for the JobThis deactivation task is not related to an AFM-CDL/MMEL item.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | ACCESS PLATFORM 1M(3 FT) |
| No specific | AR | WARNING NOTICE(S) |
| IAE1N20010 | 1 | LOCKOUT PIN - THRUST REVERSER |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-13-00-010-010-A | Opening of the Fan Cowls 437AL(447AL),438AR(448AR) |
Thrust Reverser Hydraulic Control Unit (HCU)Subtask 78-30-00-941-057-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(b) Put a WARNING NOTICE(S) on the Thrust levers to tell persons that the Thrust Reverser HCU is deactivated.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
Subtask 78-30-00-010-057-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(b) Put a WARNING NOTICE(S) on the Thrust levers to tell persons that the Thrust Reverser HCU is deactivated.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
B. Get Access
(1) Open the fan cowls (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.
4. Procedure(1) Open the fan cowls (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.
Subtask 78-30-00-040-054-A ** ON A/C NOT FOR ALL
A. Deactivate the Thrust Reverser HCU with Lockout Pin with red warning flag (IAE 1N20010)
(2) Install the IAE1N20010 LOCKOUT PIN - THRUST REVERSER (2) with the red warning flag (4), in the lockout hole of the HCU.
WARNING:
DO NOT CAUSE A BLOCKAGE OF THE HYDRAULIC CONTROL UNIT (HCU) RETURN PORT TO DEACTIVATE THE HCU. IF YOU CAUSE A BLOCKAGE OF THE HCU RETURN PORT THE THRUST REVERSER CAN OPERATE ACCIDENTLY AND CAUSE INJURY OR DAMAGE.
(1) Set the lockout lever (3) on the HCU (1) to the lockout position. (2) Install the IAE1N20010 LOCKOUT PIN - THRUST REVERSER (2) with the red warning flag (4), in the lockout hole of the HCU.