Installation of the APU Bleed Check-Valve

TASK 36-12-51-400-001-A
Installation of the APU Bleed Check-Valve

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

WARNING: ALWAYS USE APPLICABLE GLOVES TO TOUCH HOT PARTS. HOT PARTS CAN CAUSE INJURY TO PERSONS.

WARNING: BE CAREFUL WHEN THE DUCTS ARE DISCONNECTED THE TEMPERATURE OF THE EXHAUST GASES FROM THE OPEN ENDS OF THE DISCONNECTED DUCTS CAN BE AS HIGH AS 270 DEG.C (518 DEG.F). THE HOT GASES CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

CAUTION: BE VERY CAREFUL WHEN YOU DO WORK ON OR NEAR THE AIR-CONDITIONING DUCTS. THE DUCTS ARE MADE OF THIN MATERIAL AND YOU CAN EASILY BREAK THEM.

CAUTION: DO NOT PUT YOUR WEIGHT ON THE DUCTS. IT IS VERY EASY TO BREAK THEM.

ZONE: 150
ZONE: 190
ZONE: 211
FIN: 7260HM

1. Reason for the Job
Self explanatory
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	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 3.1 and 2.5 m.N (27.43 and 22.12 lbf.in )
No specific	Torque wrench: range to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in )
No specific	Torque wrench: range to between 0.5 and 0.4 m.daN (44.25 and 35.40 lbf.in )
No specific	Torque wrench: range to between 0.57 and 0.51 m.daN (50.44 and 45.13 lbf.in )
No specific	Torque wrench: range to between 1.06 and 0.82 m.daN (93.81 and 72.57 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03FAB1)	Mineral Oil base Grease-- Vaseline or Petrolatum -
(Material No.03JCA9)	Silicone base Grease-Mechanisms and Seals - -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
150	AFT CARGO COMPARTMENT FWD PRESS BULKHEAD TO AFT BULKHEAD OF AFT CARGO COMPARTMENT
190	BELLY FAIR, AIR CONDITIONING & HYD COMPT
211	COCKPIT
197BB
197KB

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
18	O-RING	AIPC 36-12-03-28-250
12	O-RING	AIPC 36-12-51-01-020

E. Referenced Information

REFERENCE	DESIGNATION
TASK 12-33-21-618-001-A-02	Pre-conditioning with the APU
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
TASK 21-43-00-710-003-A	Operational Test of the AFT Cargo Compartment Heating System
TASK 21-43-52-400-001-A	Installation of the Pressure Regulating Valve - Aft Cargo-Compartment Heating
TASK 29-00-00-910-004-A	General Rules for Removal and Installation Procedures in the Hydraulic Systems
TASK 36-22-17-400-001-A	Installation of the APU Overheat Sensing-Elements
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 ** ON A/C NOT FOR ALL
APU Bleed Check-Valve ** ON A/C NOT FOR ALL
APU Bleed Check-Valve ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 36-12-51-860-051-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the WARNING NOTICE(S) is (are) in position:

In the cockpit, on engine control panel 115VU, to tell persons not to start the engine(s)
In the cockpit, on AIR COND overhead control-panel 30VU, to tell persons not to push the APU BLEED pushbutton switch
On the HP ground connector, to tell persons not to pressurize the pneumatic system.

(2) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position below access panel 197BB.
(3) Make sure that access panel 197BB is removed (Ref. AMM TASK 53-35-13-000-002).

Subtask 36-12-51-860-051-C ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the WARNING NOTICE(S) is (are) in position:

In the cockpit, on engine control panel 115VU, to tell persons not to start the engine(s)
In the cockpit, on AIR COND overhead control panel 30VU, to tell persons not to push the APU BLEED pushbutton switch
On the HP ground connector, to tell persons not to pressurize the pneumatic system.

(2) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position below access panel 197KB.
(3) Make sure that access panel 197KB is removed (Ref. AMM TASK 53-35-13-000-002).

Subtask 36-12-51-865-051-A

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AIR BLEED/ENG 1/CTL	3HA1	D12
49VU	AIR BLEED/ENG 1/MONG	2HA1	D11
** ON A/C ALL
49VU	AIR BLEED/X FEED/VALVE/BAT	2HV	D13
** ON A/C NOT FOR ALL
49VU	AIR BLEED/ENG 2/MONG	3HA2	D12
49VU	AIR BLEED/ENG 1/CTL	2HA1	D11
** ON A/C NOT FOR ALL
122VU	AIR BLEED/ENG 2/CTL	3HA2	Z23
122VU	AIR BLEED/ENG 2/MONG	2HA2	Z22
** ON A/C ALL
122VU	AIR BLEED/X FEED VALVE/NORM	1HV	Z20
** ON A/C NOT FOR ALL
122VU	AIR BLEED/ENG 1/MONG	3HA1	Z23
122VU	AIR BLEED/ENG 2/CTL	2HA2	Z22

4. Procedure
Subtask 36-12-51-420-054-A ** ON A/C NOT FOR ALL

A. Installation of the APU Bleed Check-Valve
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the PLUG-BLANKING from each disconnected line end.
(4) Apply Silicone base Grease-Mechanisms and Seals - - (Material No.03JCA9) to a new AIPC 36-12-51-01-020 O-RING (12).
(5) Install the new O-ring (12) on the APU bleed check-valve (13).
(6) Install the APU bleed check-valve (13) on the housing (11).
(7) Install the clamp (14) on the bleed air duct (2):
(a) Do not tighten the clamp (14) at this time.
(8) Carefully move the bleed air duct (2) to its correct installation position.
(9) Install the clamp (14) in its correct installation position on the housing (11) and the bleed air duct (2).
(10) TORQUE the bolt of the clamp (14) to between 0.5 and 0.4 m.daN (44.25 and 35.40 lbf.in )

.
(11) Install the connecting rods (3) with the bolts (1), the washers (6) and the nuts (7).
(12) TORQUE the nuts (7) to between 1.06 and 0.82 m.daN (93.81 and 72.57 lbf.in )

.
(13) If necessary, adjust the bleed air ducts (9) and (2) with the connecting rods (3):
(a) Make sure that there is no tension on the bleed air ducts (9) and (2).
(14) Connect the bonding straps (8) to the bleed air duct (2) with the bolt (10), the washer (5) and the nut (4).
(15) TORQUE the nut (4) to between 0.48 and 0.37 m.daN (42.48 and 32.74 lbf.in )

.
(16) Install the clamp (19) on the bleed air duct (9).
(17) TORQUE the screw of the clamp (19) to between 3.1 and 2.5 m.N (27.43 and 22.12 lbf.in )

.
(18) Install the washers (17) and the bolts (18) to the bracket (16).
(19) TORQUE the bolts (18) to between 1.06 and 0.82 m.daN (93.81 and 72.57 lbf.in )

CAUTION: REMOVE OR INSTALL THE SENSING ELEMENTS CAREFULLY. DO NOT TWIST, BEND OR CAUSE KINKS IN THE SENSING ELEMENTS. IF YOU DO, YOU CAN CAUSE DAMAGE TO THEM.

(20) Install the APU overheat sensing-elements (15) on the bleed air duct (2) (Ref. AMM TASK 36-22-17-400-001).
(21) If the hydraulic pipe is removed, install it (Ref. AMM TASK 29-00-00-910-004).
(22) Do the electrical bonding procedure (Ref. AMM TASK 20-28-00-912-802).

Subtask 36-12-51-420-054-B ** ON A/C NOT FOR ALL

A. Installation of the APU Bleed Check-Valve
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the PLUG-BLANKING from each disconnected line end.
(4) Apply Silicone base Grease-Mechanisms and Seals - - (Material No.03JCA9) to the new AIPC 36-12-51-01-020 O-RING (12).
(5) Install the new O-ring (12) on the APU bleed check-valve (13).
(6) Install the APU bleed check-valve (13) on the housing (11).
(7) Install the clamp (14) on the bleed air duct (2):
(a) Do not tighten the clamp (14) at this time.
(8) Carefully move the bleed air duct (2) to its correct installation position.
(9) Install the clamp (14) in its correct installation position on the housing (11) and the bleed air duct (2).
(10) TORQUE the bolt of the clamp (14) to between 0.5 and 0.4 m.daN (44.25 and 35.40 lbf.in )

.
(11) Install the connecting rods (3) with the bolts (1), the washers (6) and the nuts (7).
(12) TORQUE the nuts (7) to between 1.06 and 0.82 m.daN (93.81 and 72.57 lbf.in )

.
(16) Install the clamp (22) on the bleed air duct (9).
(17) TORQUE the screw of the clamp (22) to between 3.1 and 2.5 m.N (27.43 and 22.12 lbf.in )

.
(18) If the Pressure Regulating Valve (PRV) (16) is removed, install it (Ref. AMM TASK 21-43-52-400-001).
(19) Lubricate the new AIPC 36-12-03-28-250 O-RING (18) with Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) .
(20) Install the new O-ring (18) in position on the bleed air duct (2).
(21) Install the clamp (17) on the bleed air duct (2).
(22) Connect the bleed air duct (2) to the PRV (16).
(23) TORQUE the bolt of the clamp (17) to between 0.57 and 0.51 m.daN (50.44 and 45.13 lbf.in )

.
(24) Install the washers (20) and the bolts (21) to the bracket (19).
(25) TORQUE the bolts (21) to between 1.06 and 0.82 m.daN (93.81 and 72.57 lbf.in )

CAUTION: REMOVE OR INSTALL THE SENSING ELEMENTS CAREFULLY. DO NOT TWIST, BEND OR CAUSE KINKS IN THE SENSING ELEMENTS. IF YOU DO, YOU CAN CAUSE DAMAGE TO THEM.

(26) Install the APU overheat sensing-elements (15) on the bleed air duct (2) (Ref. AMM TASK 36-22-17-400-001).
(27) If the hydraulic pipe is removed, install it (Ref. AMM TASK 29-00-00-910-004).
(28) Do the electrical bonding procedure (Ref. AMM TASK 20-28-00-912-802).

Subtask 36-12-51-865-055-A

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	AIR BLEED/ENG 1/CTL	3HA1	D12
49VU	AIR BLEED/ENG 1/MONG	2HA1	D11
** ON A/C ALL
49VU	AIR BLEED/X FEED/VALVE/BAT	2HV	D13
** ON A/C NOT FOR ALL
49VU	AIR BLEED/ENG 2/MONG	3HA2	D12
49VU	AIR BLEED/ENG 1/CTL	2HA1	D11
** ON A/C NOT FOR ALL
122VU	AIR BLEED/ENG 2/CTL	3HA2	Z23
122VU	AIR BLEED/ENG 2/MONG	2HA2	Z22
** ON A/C ALL
122VU	AIR BLEED/X FEED VALVE/NORM	1HV	Z20
** ON A/C NOT FOR ALL
122VU	AIR BLEED/ENG 1/MONG	3HA1	Z23
122VU	AIR BLEED/ENG 2/CTL	2HA2	Z22

Subtask 36-12-51-710-050-A ** ON A/C NOT FOR ALL

C. Leak Test
(1) Do the pre-conditioning with the APU (Ref. AMM TASK 12-33-21-618-001).
(2) Make sure that there is no leak between the housing (11) and the bleed air duct (2).

Subtask 36-12-51-710-050-B ** ON A/C NOT FOR ALL

C. Leak Test
(1) Do the ground air pre-conditioning with the APU (Ref. AMM TASK 12-33-21-618-001).
(2) Make sure that there is no leak between:
(a) The housing (11) and the bleed air duct (2).
(b) The bleed air duct (2) and the PRV (16).
(3) After a minimum of 15 minutes, stop the pre-conditioning (Ref. AMM TASK 12-33-21-618-001).
(4) Do the operation test of the AFT-cargo-compartment heating system (Ref. AMM TASK 21-43-00-710-003).

5. Close-up
Subtask 36-12-51-410-050-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 (Ref. AMM TASK 53-35-13-400-002).

Subtask 36-12-51-410-050-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 (Ref. AMM TASK 53-35-13-400-002).

Subtask 36-12-51-942-051-A

B. Put the aircraft back to the serviceable condition.
(1) Remove the WARNING NOTICE(S).
(2) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 12:38:05 UTC