Detailed Visual Inspection of Trim-Air Check-Valves Flappers for Condition and Operation

TASK 21-63-42-210-001-A
Detailed Visual Inspection of Trim-Air Check-Valves Flappers for Condition and Operation

ZONE: 191
FIN: 18HM
FIN: 19HM

1. Reason for the Job
Refer to the MPD TASK: 216242-01
DETAILED INSPECTION OF TRIM AIR CHECK VALVES FLAPPERS FOR CONDITION AND OPERATION
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	PLIERS - CONNECTOR, JAW, SOFT

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
191	AIR CONDITIONING COMPT AND FAIRINGS

C. Referenced Information

REFERENCE	DESIGNATION
TASK 21-63-42-000-001-A	Removal of the Trim-Air Check Valves
TASK 21-63-42-400-001-A	Installation of the Trim-Air Check Valves

3. Job Set-up
Subtask 21-63-42-020-052-A

A. Remove the trim-air check valve (Ref. AMM TASK 21-63-42-000-001).

4. Procedure
Subtask 21-63-42-210-054-A

A. Detailed Visual Inspection
(1) Make sure that the check valve is clean.
(2) Do a full visual inspection of the valve-flappers, their seats, the hinge pin and the return spring (if installed) for signs of:

Cracks
Dents
Marks or corrosion.

(3) Remove the spring (if installed) with PLIERS - CONNECTOR, JAW, SOFT if it is damaged or broken and discard it.
(4) Make sure that the valve-flappers operate correctly on their hinge pin. To do this, move them with your hand. Also make sure that the valve-flappers touch their seats correctly.

5. Close-up
Subtask 21-63-42-420-052-A

A. Install the trim-air check valve (Ref. AMM TASK 21-63-42-400-001).

[Rev.10 from 2021] 2026.04.02 06:11:44 UTC