Removal of the Emergency Ram-Air Check-Valve

TASK 21-55-41-000-001-A
Removal 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 Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT)

B. Referenced Information

REFERENCE	DESIGNATION
TASK 25-54-12-000-001-A	Removal 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 06-41-53-00	FUSELAGE-DESCRIPTION AND OPERATION
Emergency Ram Air Check Valve 4022HM

3. Job Set-up
Subtask 21-55-41-010-050-A

A. Get Access
(1) Open the FWD cargo door 825. (Ref. AMM TASK 52-30-00-860-001)
(2) Put the ACCESS PLATFORM 2M (6 FT) at the fwd cargo door 825.
(3) Remove the access panel at partition FR34 (Ref. AMM D/O 06-41-53-00), (Ref. AMM TASK 25-54-12-000-001).

4. Procedure
Subtask 21-55-41-020-050-A

A. Removal of the Emergency Ram-Air Check-valve
(1) Remove the V-clamp (5).
(2) Remove the clamp (2).
(3) Remove the flange (3) together with the check valve (4).
(4) Remove the check valve (4) from the flange (3).

[Rev.10 from 2021] 2026.04.02 06:11:32 UTC