Inspection of the APU Bleed Check-Valve for Correct Condition

TASK 36-12-00-040-804-A
Inspection of the APU Bleed Check-Valve for Correct Condition

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 USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 152
FIN: 7260HM ** ON A/C NOT FOR ALL

1. Reason for the Job
MMEL 36-22-03E
APU LEAK DETECTION LOOP
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	1	GAGE - FEELER
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

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

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
152	AFT CARGO COMPARTMENT
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
APU Bleed Check-Valve

3. Job Set-up
Subtask 36-12-00-865-083-A ** ON A/C NOT FOR ALL

A. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	ENGINE/2/FADEC A/AND EIU 2	2KS2	A05
49VU	ENGINE/1/FADEC A/AND EIU 1	2KS1	A04
49VU	AIR BLEED/X FEED/VALVE/BAT	2HV	D13
49VU	AIR BLEED/ENG 1/CTL	3HA1	D12
49VU	AIR BLEED/ENG 1/MONG	2HA1	D11
121VU	ENGINE/ENG2/FADEC B	4KS2	Q40
121VU	ENGINE/ENG1/FADEC B/AND EIU 1	4KS1	R41
122VU	AIR BLEED/ENG 2/CTL	3HA2	Z23
122VU	AIR BLEED/ENG 2/MONG	2HA2	Z22
122VU	AIR BLEED/X FEED VALVE/NORM	1HV	Z20

Subtask 36-12-00-860-090-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) On AIR COND panel 30VU:

Make sure that the ENG 1(2) BLEED pushbutton switch is pushed (OFF legend off).
Make sure that the APU BLEED pushbutton switch is released (ON legend off).
Put a WARNING NOTICE(S) in position to tell persons not to operate the pneumatic system.

(2) On ENG panel 115VU:

Put a WARNING NOTICE(S) in position to tell persons not to start engine 1(2).

(3) On the HP ground connector:

Put a WARNING NOTICE(S) in position to tell persons not to pressurize the pneumatic system.

Subtask 36-12-00-010-063-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put an ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position.
(2) Remove access panel 197BB.

Subtask 36-12-00-010-063-C ** ON A/C NOT FOR ALL

C. Get Access
(1) Put an ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position.
(2) Remove access panel 197KB.

4. Procedure
Subtask 36-12-00-220-050-A ** ON A/C NOT FOR ALL

A. Detailed Inspection of the APU Bleed Check-Valve
(1) Remove the APU bleed check-valve (Ref. AMM TASK 36-12-51-000-001).
(2) To make sure that the APU bleed check-valve is in the correct condition, do the steps that follow:
(a) Make sure that the flaps, the hinge pin and/or the spring are not missing in the APU bleed check-valve:
1 If the parts are missing:
a Do a visual inspection of the APU bleed-air system and the air conditioning system to find and remove this (these) part (parts). Then replace the APU bleed check-valve (Ref. AMM TASK 36-12-51-400-001).
(b) Make sure that there are no cracks, dents, corrosion or wear because of friction:
1 If the flaps and/or the stop on the APU bleed check-valve are worn:

Remove the marks with a fine-grade scotch-brite pad Abrasive-- Scotch Brite Pads - (Material No.14FAB1) .

(c) Make sure that the flaps open and close freely.
(d) Measure the play between each valve flap and the intake ring as follows:
1 Move the valve flap to the hinge pin to measure the maximum play.
2 With a GAGE - FEELER, measure the play between the full surface of the valve flap and the intake ring in the radial direction.
3 Make sure that the play between the full surface of the valve flap and the intake ring is not more than 0.030 in. (0.7620 mm).
(3) If the APU bleed check-valve is in the correct condition, install the APU bleed check-valve (Ref. AMM TASK 36-12-51-400-001).
(4) If the APU bleed check-valve is not in the correct condition, replace the APU bleed check-valve (Ref. AMM TASK 36-12-51-400-001).

5. Close-up
Subtask 36-12-00-410-063-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install access panel 197BB.
(3) Remove the access platform(s).

Subtask 36-12-00-410-063-C ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install access panel 197KB.
(3) Remove the access platform(s).

Subtask 36-12-00-865-084-A ** ON A/C NOT FOR ALL

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	ENGINE/2/FADEC A/AND EIU 2	2KS2	A05
49VU	ENGINE/1/FADEC A/AND EIU 1	2KS1	A04
49VU	AIR BLEED/X FEED/VALVE/BAT	2HV	D13
49VU	AIR BLEED/ENG 1/CTL	3HA1	D12
49VU	AIR BLEED/ENG 1/MONG	2HA1	D11
121VU	ENGINE/ENG2/FADEC B	4KS2	Q40
121VU	ENGINE/ENG1/FADEC B/AND EIU 1	4KS1	R41
122VU	AIR BLEED/ENG 2/CTL	3HA2	Z23
122VU	AIR BLEED/ENG 2/MONG	2HA2	Z22
122VU	AIR BLEED/X FEED VALVE/NORM	1HV	Z20

Subtask 36-12-00-860-091-A ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 01:14:59 UTC