DOC AIRBUS | AMM A320FInstallation of the ACT Overpressure Protector
TASK 28-12-42-400-001-A
Installation of the ACT Overpressure Protector
Self explanatory
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 28-12-42-860-050-A ** ON A/C NOT FOR ALL
Subtask 28-12-42-420-050-B ** ON A/C NOT FOR ALL
Subtask 28-12-42-942-050-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.02 06:17:10 UTC
Installation of the ACT Overpressure Protector
WARNING:
MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.
WARNING:
OBEY THE FUEL SAFETY PROCEDURES.
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
FIN: 256QM ** ON A/C NOT FOR ALL
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.12AGC2) | Corrosion Preventive Compound-- Soft Film System |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 147AZ |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 12-11-28-650-003-A | Pressure Refuel with Automatic Control |
| TASK 20-28-00-912-802-A | Electrical Bonding - General Maintenance Procedure |
| TASK 24-41-00-861-002-A | Energize the Aircraft Electrical Circuits from the External Power |
| TASK 24-41-00-861-002-A-01 | Energize the Aircraft Electrical Circuits from the APU |
| TASK 24-41-00-861-002-A-02 | Energize the Aircraft Electrical Circuits from Engine 1(2) |
| TASK 24-41-00-862-002-A | De-energize the Aircraft Electrical Circuits Supplied from the External Power |
| TASK 24-41-00-862-002-A-01 | De-energize the Aircraft Electrical Circuits Supplied from the APU |
| TASK 24-41-00-862-002-A-02 | De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2) |
| TASK 28-00-00-910-001-A | Fuel Safety Procedures |
| TASK 28-25-00-650-001-A | Pressure Defuel |
| TASK 28-25-00-869-001-A | Fuel Transfer |
| TASK 28-28-00-710-005-A | Operational Test of the Additional Center Tank (ACT) Automatic Transfer System |
| TASK 32-12-00-010-001-A | Open the Main Gear Doors for Access |
| TASK 32-12-00-410-001-A | Close the Main Gear Doors after Access |
| TASK 57-17-11-000-001-B | Removal of Access Cover 148AZ or/and the ACT-Equipment Support Door |
| TASK 57-17-11-400-001-B | Installation of Access Cover 148AZ or/and the ACT-Equipment Support-Door |
ACT Overpressure Protector (256QM, 257QM)Subtask 28-12-42-860-050-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
(1) You must obey the fuel safety procedures when you do work on the fuel system (Ref. AMM TASK 28-00-00-910-001).
(2) Make sure that the aircraft electrical circuits are energized.
(Ref. AMM TASK 24-41-00-861-002).
(3) On the APU section of overhead panel 25VU, make sure that the APU/MASTER SW pushbutton switch is released (the ON legend is off).
(4) On the FUEL section of panel 40VU, make sure that all the L TK PUMPS and R TK PUMPS pushbutton switches are released (the OFF legends are on).
(5) Make sure that the WARNING NOTICE(S) are in position:
(7) Make sure that the fuel center tank is defueled (Ref. AMM TASK 28-25-00-650-001).
(8) Make sure that the right MLG door is open (Ref. AMM TASK 32-12-00-010-001).
(9) Make sure that the ACCESS PLATFORM 2M (6 FT) is in position at the right MLG door.
(10) Make sure that access cover 147AZ is removed (Ref. AMM TASK 57-17-11-000-001).
(11) Make sure that the CONTAINER 5 L (1.32 USGAL) is in position below the ACT overpressure protector (1).
Subtask 28-12-42-865-051-A ** ON A/C NOT FOR ALL (1) You must obey the fuel safety procedures when you do work on the fuel system (Ref. AMM TASK 28-00-00-910-001).
(2) Make sure that the aircraft electrical circuits are energized.
(Ref. AMM TASK 24-41-00-861-002).
(3) On the APU section of overhead panel 25VU, make sure that the APU/MASTER SW pushbutton switch is released (the ON legend is off).
(4) On the FUEL section of panel 40VU, make sure that all the L TK PUMPS and R TK PUMPS pushbutton switches are released (the OFF legends are on).
(5) Make sure that the WARNING NOTICE(S) are in position:
- On APU section of overhead panel 25VU, to tell persons not to operate the APU/MASTER SW pushbutton switch
- On FUEL section of panel 40VU, to tell persons not to operate the fuel system
- On ENG/APU FIRE panel 1WD on overhead panel 20VU, to tell persons not to operate the fire extinguishing system.
(7) Make sure that the fuel center tank is defueled (Ref. AMM TASK 28-25-00-650-001).
(8) Make sure that the right MLG door is open (Ref. AMM TASK 32-12-00-010-001).
(9) Make sure that the ACCESS PLATFORM 2M (6 FT) is in position at the right MLG door.
(10) Make sure that access cover 147AZ is removed (Ref. AMM TASK 57-17-11-000-001).
(11) Make sure that the CONTAINER 5 L (1.32 USGAL) is in position below the ACT overpressure protector (1).
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
4. Procedure| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | FUEL/ACT VENT VLV/MAN/SPLY | 62QH | L21 |
| 121VU | FUEL/ACT VENT VLV/AUTO/SPLY | 61QH | L20 |
Subtask 28-12-42-420-050-B ** ON A/C NOT FOR ALL
A. Installation of the ACT Overpressure Protector
(1) Remove the PLUG - BLANKING from the disconnected line ends.
(2) Put the ACT overpressure protector (1) in position on the machined tee.
(3) Install the bolts (3) and the nuts (2).
(4) TORQUE the nuts (2) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in )
.
(5) Apply Corrosion Preventive Compound-- Soft Film System (Material No.12AGC2) on the nuts (2).
(6) Do a check of the electrical bonding (Ref. AMM TASK 20-28-00-912-802).
Subtask 28-12-42-865-052-A ** ON A/C NOT FOR ALL (1) Remove the PLUG - BLANKING from the disconnected line ends.
(2) Put the ACT overpressure protector (1) in position on the machined tee.
(3) Install the bolts (3) and the nuts (2).
(4) TORQUE the nuts (2) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in )
. (5) Apply Corrosion Preventive Compound-- Soft Film System (Material No.12AGC2) on the nuts (2).
(6) Do a check of the electrical bonding (Ref. AMM TASK 20-28-00-912-802).
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 28-12-42-410-050-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | FUEL/ACT VENT VLV/MAN/SPLY | 62QH | L21 |
| 121VU | FUEL/ACT VENT VLV/AUTO/SPLY | 61QH | L20 |
C. Close Access
(1) Make sure that there are no unwanted objects and materials, tools or other equipment in the center tank.
(2) Install access cover 147AZ (Ref. AMM TASK 57-17-11-400-001).
Subtask 28-12-42-650-051-A ** ON A/C NOT FOR ALL (1) Make sure that there are no unwanted objects and materials, tools or other equipment in the center tank.
(2) Install access cover 147AZ (Ref. AMM TASK 57-17-11-400-001).
D. Fuel Configuration
(1) Refuel, defuel or transfer fuel as necessary (Ref. AMM TASK 12-11-28-650-003), (Ref. AMM TASK 28-25-00-650-001) or (Ref. AMM TASK 28-25-00-869-001).
Subtask 28-12-42-790-050-A ** ON A/C NOT FOR ALL (1) Refuel, defuel or transfer fuel as necessary (Ref. AMM TASK 12-11-28-650-003), (Ref. AMM TASK 28-25-00-650-001) or (Ref. AMM TASK 28-25-00-869-001).
E. Leak Test of the Overpressure Protector
(1) Do the operational test of the ACT automatic transfer-system (Ref. AMM TASK 28-28-00-710-005).
5. Close-up(1) Do the operational test of the ACT automatic transfer-system (Ref. AMM TASK 28-28-00-710-005).
Subtask 28-12-42-942-050-A ** ON A/C NOT FOR ALL
A. Removal of Equipment
(1) Remove the container.
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).
Subtask 28-12-42-410-051-A ** ON A/C NOT FOR ALL (1) Remove the container.
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).
B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the right MLG door (Ref. AMM TASK 32-12-00-410-001).
(3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the right MLG door (Ref. AMM TASK 32-12-00-410-001).
(3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).