Removal of Intermediate Pressure Bleed Check Valve for Detailed Inspection

TASK 36-11-41-200-802-A
Removal of Intermediate Pressure Bleed Check Valve for Detailed Inspection

WARNING: MAKE SURE THAT THE PNEUMATIC SYSTEM IS DEPRESSURIZED BEFORE YOU START WORK. PRESSURIZED AIR CAN CAUSE INJURY TO PERSONNEL.

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 450
ZONE: 460

1. Reason for the Job
Refer to the MPD TASK: 361141-06
REMOVE INTERMEDIATE PRESSURE BLEED CHECK VALVE FOR DETAILED INSPECTION
This task does the inspection/check of the two possible types of IP bleed check valve:

With return spring(s)
With no return spring.

2. Job Set-up Information
A. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08BBB1)	Non Aqueous Cleaner-- Petroleum Based -
(Material No.14SBA1)	Textile-Lint free Cotton -

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
450	ENG 1 THRUST REVERSER & EXHAUST SECTION
460	ENG 2 THRUST REVERSER & EXHAUST SECTION

C. Referenced Information

REFERENCE	DESIGNATION
TASK 36-11-41-000-802-A	Removal of the Environmental Control System (ECS) Mid-Y Duct and the Intermediate Pressure Check Valve (IPCV)
TASK 36-11-41-400-802-A	Installation of the Environmental Control System (ECS) Mid-Y Duct and the Intermediate Pressure Check Valve (IPCV)
IP Bleed Check-Valve

3. Job Set-up
Subtask 36-11-41-010-074-A ** ON A/C NOT FOR ALL

A. Remove the Intermediate-Pressure (IP) Bleed Check-Valve (Ref. AMM TASK 36-11-41-000-802)

4. Procedure
Subtask 36-11-41-110-057-A ** ON A/C NOT FOR ALL

A. Cleaning of the IP Bleed Check-Valve
(1) Clean the IP bleed check-valve with a Textile-Lint free Cotton - (Material No.14SBA1) , moist with Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) .
(2) Dry the IP bleed check-valve with a lint-free cloth Textile-Lint free Cotton - (Material No.14SBA1) .

Subtask 36-11-41-210-063-A ** ON A/C NOT FOR ALL

B. Inspection of the IP Bleed Check-Valve
(1) Examine the check valve (5) for damage.
(a) Make sure that the flappers (4), their seats (3), the hinge pin (2) and the visualization tab (1) are in the correct condition:

Make sure that there are no cracks, missing parts, bosses, corrosion or significant wear marks.
If you find cracks, bosses, dents, corrosion or frictional wear on the valve, replace the IP bleed check-valve (Ref. AMM TASK 36-11-41-400-802).

(2) Do a detailed inspection of the IP bleed check-valve (5).
(a) If you find missing parts, replace the IP bleed check-valve (Ref. AMM TASK 36-11-41-400-802).
(3) Do a functional test of the IP bleed check-valve (5).
(a) Hold the check-valve (5) with the hinge pin (2) horizontal and the flappers (4) in the closed position.
1 Make sure that the flappers (4) are in the fully closed position.
(b) Turn the check-valve (5) so that the flappers (4) hang open with gravity.
1 Make sure that the flappers (4) are in the fully open position, move freely, and do not stick or bind.
2 If the flappers (4) do not open fully, do not move freely, or stick or bind, replace the check-valve (5) (Ref. AMM TASK 36-11-41-400-802).
(c) Turn the check-valve (5) so that the flappers (4) close with gravity.
1 Make sure that the flappers (4) are in the fully closed position, move freely, and do not stick or bind
2 If the flappers (4) do not close fully, do not move freely, or stick or bind, replace the check-valve (5) (Ref. AMM TASK 36-11-41-400-802).

5. Close-up
Subtask 36-11-41-410-070-A ** ON A/C NOT FOR ALL

A. Installation the IP Bleed Check-Valve (Ref. AMM TASK 36-11-41-400-802)

[Rev.10 from 2021] 2026.04.01 01:09:13 UTC