DOC AIRBUS | AMM A320FGeneral Check of the Hydraulic Control Unit (HCU) General Condition and Filter Indicator, without component removal [IAE]
TASK 78-31-51-200-010-A
General Check of the Hydraulic Control Unit (HCU) General Condition and Filter Indicator, without component removal
This task gives the data for a general check of the Hydraulic Control Unit and filter indicator without component removal.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Referenced Information
3. Job Set-up
Subtask 78-31-51-941-066-A ** ON A/C NOT FOR ALL
Subtask 78-31-51-210-060-A ** ON A/C NOT FOR ALL
Subtask 78-31-51-440-064-A ** ON A/C NOT FOR ALL Subtask 78-31-51-410-074-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 03:27:43 UTC
General Check of the Hydraulic Control Unit (HCU) General Condition and Filter Indicator, without component removal
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
ZONE: 400
1. Reason for the JobThis task gives the data for a general check of the Hydraulic Control Unit and filter indicator without component removal.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE |
| No specific | AR | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.V01-002) | cleaning fluid |
| (Material No.14SBA1) | Textile-Lint free Cotton - |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 400 | POWER PLANT, NACELLES AND PYLONS |
| 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) |
| TASK 71-13-00-410-010-A | Closing of the Fan Cowls 437AL(447AL),438AR(448AR) |
| TASK 78-30-00-040-012-A | Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance |
| TASK 78-30-00-440-012-A | Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance |
| TASK 78-31-00-710-041-A | Operational Test of the Thrust Reverser System with the CFDS |
| TASK 78-31-00-710-041-A-02 | Operational test of the Thrust Reverser without the CFDS and Engine Running |
| TASK 78-31-51-000-010-A | Removal of the Thrust Reverser Hydraulic Control Unit (HCU) |
| TASK 78-31-51-000-011-A | Removal of the Thrust Reverser HCU Filter Cartridge |
| TASK 78-31-51-400-010-A | Installation of the Thrust Reverser Hydraulic Control Unit (HCU) |
| TASK 78-31-51-400-011-A | Installation of the Thrust Reverser HCU Filter Cartridge |
HCU Filter IndicatorSubtask 78-31-51-941-066-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.
(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 78-31-51-010-083-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.
(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 2M (6 FT) - ADJUSTABLE in to position.
Subtask 78-31-51-040-070-A ** ON A/C NOT FOR ALL (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 2M (6 FT) - ADJUSTABLE in to position.
C. Deactivate the thrust reverser
Subtask 78-31-51-110-054-A ** ON A/C NOT FOR ALL WARNING:
MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.
(1) Deactivate the thrust reverser Hydraulic Control Unit (Ref. AMM TASK 78-30-00-040-012)D. Clean the Glass Bowl
(1) Clean the glass bowl with a clean Textile-Lint free Cotton - (Material No.14SBA1) made moist with cleaning fluid (Material No.V01-002) .
4. Procedure(1) Clean the glass bowl with a clean Textile-Lint free Cotton - (Material No.14SBA1) made moist with cleaning fluid (Material No.V01-002) .
Subtask 78-31-51-210-060-A ** ON A/C NOT FOR ALL
A. Examine the Sight Glass to find the red indicator is visible in it.
(1) If the red indicator (2) is not extended in to the sight glass (1), the HCU filter has not clogged and is in serviceable condition.
(2) If the red indicator (2) is extended in to the sight glass (1), the HCU filter has clogged and must be replaced (Ref. AMM TASK 78-31-51-000-011) and (Ref. AMM TASK 78-31-51-400-011).
Subtask 78-31-51-210-061-A ** ON A/C NOT FOR ALL (1) If the red indicator (2) is not extended in to the sight glass (1), the HCU filter has not clogged and is in serviceable condition.
(2) If the red indicator (2) is extended in to the sight glass (1), the HCU filter has clogged and must be replaced (Ref. AMM TASK 78-31-51-000-011) and (Ref. AMM TASK 78-31-51-400-011).
B. Examine the lock-out pin stowage bracket for heat damage.
(1) If the lock-out pin nylon stowage bracket shows signs of heat damage (if it is deformed or melted, for example), replace the HCU (Ref. AMM TASK 78-31-51-000-010) and (Ref. AMM TASK 78-31-51-400-010).
5. Close-up(1) If the lock-out pin nylon stowage bracket shows signs of heat damage (if it is deformed or melted, for example), replace the HCU (Ref. AMM TASK 78-31-51-000-010) and (Ref. AMM TASK 78-31-51-400-010).
Subtask 78-31-51-440-064-A ** ON A/C NOT FOR ALL Subtask 78-31-51-410-074-A ** ON A/C NOT FOR ALL
B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).
Subtask 78-31-51-710-060-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).
C. Operational Test
(1) Do an operational test of the thrust reverser system (Ref. AMM TASK 78-31-00-710-041).
(1) Do an operational test of the thrust reverser system (Ref. AMM TASK 78-31-00-710-041).
NOTE: As an alternative procedure, you can do the operational test without the CFDS (Ref. AMM TASK 78-31-00-710-041).