DOC AIRBUS | AMM A320FInstallation of the Emergency Ram-Air Check-Valve
TASK 21-55-41-400-001-A
Installation of the Emergency Ram-Air Check-Valve
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Job Set-up
Subtask 21-55-41-860-050-A
Subtask 21-55-41-420-050-A
Subtask 21-55-41-410-050-A
[Rev.10 from 2021]
2026.04.02 06:48:46 UTC
Installation of the Emergency Ram-Air Check-Valve
WARNING:
MAKE SURE THAT AIR IS NOT SUPPLIED TO THE AIR CONDITIONING SYSTEM FROM THE MAIN ENGINE, THE APU OR A GROUND SOURCE.
HOT COMPRESSED AIR CAN CAUSE INJURY TO PERSONNEL.
FIN: 4022HM
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 2M (6 FT) |
| No specific | Torque wrench: range to between 0.605 and 0.495 m.daN (53.54 and 43.81 lbf.in )  |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 25-54-12-000-001-A | Removal of the Forward Cargo-Compartment Partition |
| TASK 25-54-12-400-001-A | Installation of the Forward Cargo-Compartment Partition |
| TASK 52-30-00-860-001-A | Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump |
| TASK 52-30-00-860-002-A | Close the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump |
| TASK 06-41-53-00 | FUSELAGE-DESCRIPTION AND OPERATION |
Emergency Ram Air Check Valve 4022HMSubtask 21-55-41-860-050-A
A. Aircraft Maintenance Configuration
(1) Make sure that:
(a) The cargo compartment door 825 is open (Ref. AMM TASK 52-30-00-860-001).
(b) The ACCESS PLATFORM 2M (6 FT) is in position at the FWD cargo compartment door 825.
(2) The access panel at partition FR34 (Ref. AMM D/O 06-41-53-00) is removed (Ref. AMM TASK 25-54-12-000-001).
4. Procedure(1) Make sure that:
(a) The cargo compartment door 825 is open (Ref. AMM TASK 52-30-00-860-001).
(b) The ACCESS PLATFORM 2M (6 FT) is in position at the FWD cargo compartment door 825.
(2) The access panel at partition FR34 (Ref. AMM D/O 06-41-53-00) is removed (Ref. AMM TASK 25-54-12-000-001).
Subtask 21-55-41-420-050-A
A. Installation of the Emergency Ram-Air Check-Valve
(1) Clean the component interfaces and the adjacent area.
(2) Make sure that the check valve flaps are in the correct condition.
(3) Install the check valve (4) in the flange (3), make sure that the flaps open in the direction of the airflow.
(4) Install the check valve (4) and the flange (3) in the bellows (1).
(5) Install the V-clamp (5).
(6) TORQUE the V-clamp (5) to between 0.605 and 0.495 m.daN (53.54 and 43.81 lbf.in ).
(7) Install the clamp (2) on the bellows (1) and tighten.
5. Close-up(1) Clean the component interfaces and the adjacent area.
(2) Make sure that the check valve flaps are in the correct condition.
(3) Install the check valve (4) in the flange (3), make sure that the flaps open in the direction of the airflow.
(4) Install the check valve (4) and the flange (3) in the bellows (1).
(5) Install the V-clamp (5).
(6) TORQUE the V-clamp (5) to between 0.605 and 0.495 m.daN (53.54 and 43.81 lbf.in )
. (7) Install the clamp (2) on the bellows (1) and tighten.
Subtask 21-55-41-410-050-A
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panel at partition FR34 (Ref. AMM D/O 06-41-53-00), (Ref. AMM TASK 25-54-12-400-001).
(3) Remove the access platform(s).
(4) Close the FWD cargo door 825. (Ref. AMM TASK 52-30-00-860-002)
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panel at partition FR34 (Ref. AMM D/O 06-41-53-00), (Ref. AMM TASK 25-54-12-400-001).
(3) Remove the access platform(s).
(4) Close the FWD cargo door 825. (Ref. AMM TASK 52-30-00-860-002)