Detailed Visual Inspection of Emergency Ram-Air/Low Pressure Ground-Air Check-Valve Flappers for Condition and Operation

TASK 21-55-41-210-001-A
Detailed Visual Inspection of Emergency Ram-Air/Low Pressure Ground-Air Check-Valve Flappers for Condition and Operation

ZONE: 191

1. Reason for the Job
Refer to the MPD TASK: 215541-01
DETAILED INSPECTION OF EMERGENCY RAM AIR/LP GROUND AIR CHECK VALVE FLAPPERS FOR CONDITION AND OPERATION
2. Job Set-up Information
A. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
191	AIR CONDITIONING COMPT AND FAIRINGS

B. Referenced Information

REFERENCE	DESIGNATION
TASK 21-55-41-000-001-A	Removal of the Emergency Ram-Air Check-Valve
TASK 21-55-41-400-001-A	Installation of the Emergency Ram-Air Check-Valve

3. Job Set-up
Subtask 21-55-41-020-051-A

A. Remove the emergency ram-air check-valve (Ref. AMM TASK 21-55-41-000-001).

4. Procedure
Subtask 21-55-41-210-052-A

A. Detailed Visual Inspection of the Check Valve Flappers
(1) Make sure that the check valve is clean.
(2) Make a full visual inspection of the valve-flappers and their seats, the hinge pin and the return spring of the valve-flappers for signs of cracks, dents, marks or corrosion.
(3) Make sure that the valve-flappers operate correctly on their hinge pin. To do this, move them by hand. Also make sure that the valve-flappers touch their seats correctly.

5. Close-up
Subtask 21-55-41-420-051-A

A. Install the emergency ram-air check-valve (Ref. AMM TASK 21-55-41-400-001).

[Rev.10 from 2021] 2026.04.02 06:11:33 UTC