Detailed Inspection of Check Valve Flappers for Condition and Operation

TASK 21-26-41-210-001-A
Detailed Inspection of Check Valve Flappers for Condition and Operation

WARNING: MAKE SURE THAT THE VENTILATION SYSTEM OF THE ELECTRONICS IS NOT IN OPERATION.

ZONE: 128
FIN: 2140HM

1. Reason for the Job
Refer to the MPD TASK: 212641-01
DETAILED INSPECTION OF CHECK VALVE FLAPPERS FOR CONDITION AND OPERATION
Make sure that the check valve operates correctly.
2. Job Set-up Information
A. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08BBB1)	Non Aqueous Cleaner-- Petroleum Based -

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
128	REAR AVIONIC COMPARTMENT

C. Referenced Information

REFERENCE	DESIGNATION
TASK 21-26-41-000-001-A	Removal of the Check Valve
TASK 21-26-41-400-001-A	Installation of the Check Valve

3. Job Set-up
Subtask 21-26-41-020-051-A

A. Remove the check valve (Ref. AMM TASK 21-26-41-000-001).

Subtask 21-26-41-110-050-A

B. Clean the check valve with Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) .

4. Procedure
Subtask 21-26-41-210-051-A

A. Visual Inspection of the Check Valve.
(1) Make sure that the check valve operates correctly, specially the valve clappers and their seats, the hinge pin and the return springs of the valve clappers.
(make sure that there are no missing components, cracks, dents, marks or corrosion).
(2) Make sure that the valve clappers move freely on their hinge pins. To do this, move them by hand. Also make sure that the clappers touch their seats correctly.

5. Close-up
Subtask 21-26-41-420-051-A

A. Install the check valve (Ref. AMM TASK 21-26-41-400-001).

[Rev.10 from 2021] 2026.04.02 06:11:03 UTC