Remove and Check the Auxiliary Power Unit (APU) Bleed Check-Valve for Condition

TASK 36-12-51-200-001-A
Remove and Check the Auxiliary Power Unit (APU) Bleed Check-Valve for Condition

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

ZONE: 197
FIN: 7260HM

1. Reason for the Job
Refer to the MPD TASK: 361251-01
REMOVE AND CHECK AUXILIARY POWER UNIT BLEED CHECK VALVE FOR CONDITION
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.14FAB1)	Abrasive-- Scotch Brite Pads -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
197	REAR FAIRING
197BB
197KB

D. Referenced Information

REFERENCE	DESIGNATION
TASK 36-12-51-000-001-A	Removal of the APU Bleed Check-Valve
TASK 36-12-51-400-001-A	Installation of the APU Bleed Check-Valve
TASK 53-35-13-000-002-A	Removal of the Quick-Release Access Panels from the Belly Fairing Structure
TASK 53-35-13-400-002-A	Installation of the Quick-Release Access Panels on the Belly Fairing Structure
APU Bleed Check-Valve

3. Job Set-up
Subtask 36-12-51-860-052-A

A. Put an ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position.

Subtask 36-12-51-010-051-A ** ON A/C NOT FOR ALL

B. Remove the access panel 197BB (Ref. AMM TASK 53-35-13-000-002).

Subtask 36-12-51-010-051-D ** ON A/C NOT FOR ALL

B. Remove the access panel 197KB (Ref. AMM TASK 53-35-13-000-002).

Subtask 36-12-51-020-054-A

C. Remove the APU Bleed Check-Valve (Ref. AMM TASK 36-12-51-000-001).

4. Procedure
Subtask 36-12-51-210-050-A

A. Inspection of the APU Bleed Check-Valve
(1) Make sure that the valve flaps, the hinge pin and/or the spring are not missing in the APU bleed check-valve. If the part(s) is (are) missing:
(a) Do an inspection of the APU bleed-air system and the air conditioning system. Find the part(s) before you install a new APU bleed check-valve.
(2) Examine the APU bleed check-valve for damage:
(a) If the stop and/or the valve flaps on the APU bleed check-valve are worn, remove the marks with a Abrasive-- Scotch Brite Pads - (Material No.14FAB1) .
(3) Make sure that the valve flaps open and close freely.
(4) Make sure that the spring holds the weight of the valve flaps, when the valve flaps are closed.

5. Close-up
Subtask 36-12-51-420-053-A

A. Install the APU Bleed Check-Valve (Ref. AMM TASK 36-12-51-400-001).

Subtask 36-12-51-410-051-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panel 197BB (Ref. AMM TASK 53-35-13-400-002).

Subtask 36-12-51-410-051-D ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panel 197KB (Ref. AMM TASK 53-35-13-400-002).

Subtask 36-12-51-942-053-A

C. Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 01:15:39 UTC