Installation of the Overpressure Valve

TASK 36-11-53-400-001-A
Installation of the Overpressure Valve

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

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

ZONE: 471
ZONE: 481
FIN: 5HA1 ** ON A/C NOT FOR ALL
FIN: 5HA2 ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 1M(3 FT)
No specific	1	FOIL - ALUMINUM
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 85 and 75 lbf.in (0.96 and 0.85 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.14QEB1)	Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
471	PYLON LEADING EDGE
481	PYLON LEADING EDGE
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 36-11-00-710-001-A	Operational Test to read the CURRENT STATUS of the Engine Bleed Air System
TASK 36-11-00-740-001-A	BITE Test of the BMC 1(2)
TASK 36-11-49-400-014-A	Installation of the Duct Assy
TASK 36-12-00-860-001-A	Pressurization of the Bleed System with the APU
TASK 36-12-00-860-002-A	Pressurization of the Bleed System through the HP Ground Connector
TASK 49-00-00-860-006-A	APU Shutdown by External Power
TASK 49-00-00-860-006-A-01	APU Shutdown by Batteries
TASK 49-00-00-860-009-A	APU Shutdown by External Power (131-9(A))
TASK 49-00-00-860-009-A-01	APU Shutdown by Batteries (131-9(A))
TASK 70-23-00-911-001-A	Tightening Torques
TASK 70-23-00-911-002-A	Tightening Torques
TASK 70-23-05-230-010-A	Local Application of Fluorescent Penetrant Inspection
TASK 70-23-11-911-013-A	General Torque Tightening Techniques
TASK 70-51-00-230-001-A	Fluorescent-Penetrant Inspection-Portable Water-Washable
TASK 70-51-00-230-002-A	Fluorescent-Penetrant Inspection-Portable-Water Washable
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-30-00-081-041-A	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-081-041-B	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-440-012-A	Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-30-00-481-041-B	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
TASK 78-32-00-410-010-A	Closing of the Thrust Reverser Halves
TASK 78-36-00-010-040-A	Opening of the Thrust Reverser Doors
TASK 78-36-00-010-040-B	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-A	Closing of the Thrust Reverser Doors
TASK 78-36-00-410-040-B	Closing of the Thrust Reverser Doors
Overpressure Valve ** ON A/C NOT FOR ALL
Overpressure Valve ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 36-11-53-860-050-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the aircraft electrical circuits are energized (Ref. AMM TASK 24-41-00-861-002) or (Ref. AMM TASK 24-41-00-861-002).
(2) Make sure that the engine 1(2) is shut down for a minimum of 5 minutes before you do this procedure.
(3) In the cockpit, on AIR COND panel 30VU:
(a) Make sure that the ENG 1(2) BLEED pushbutton switch is released (the OFF legend is on).
(b) Make sure that the APU BLEED pushbutton switch is released (the ON legend is off).
(c) Make sure that the WARNING NOTICE(S) is(are) in position to tell persons not to operate the pneumatic system.
(4) In the cockpit, on ENG panel 115VU:

Make sure that the WARNING NOTICE(S) is(are) in position to tell persons not to start the engine 1(2).

(5) On the HP ground connector:

Make sure that the WARNING NOTICE(S) is(are) in position to tell persons not to pressurize the pneumatic system.

(6) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR 1(2) pushbutton switch is off.
(b) Make sure that the WARNING NOTICE(S) is(are) in position to tell persons not to energize FADEC 1(2).
(7) Make sure that an ACCESS PLATFORM 1M(3 FT) is in position below the engine 1(2).

Subtask 36-11-53-010-054-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Make sure that the thrust reverser doors are open (Ref. AMM TASK 78-36-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 36-11-53-040-052-A ** ON A/C NOT FOR ALL

C. Make sure that the thrust reverser is unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 36-11-53-010-054-B ** ON A/C NOT FOR ALL

D. Get Access
(1) Make sure that the fan cowls are open (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Make sure that the thrust reverser halves are open (Ref. AMM TASK 78-32-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 36-11-53-040-052-B ** ON A/C NOT FOR ALL

E. Make sure that the thrust reverser Hydraulic Control Unit (HCU) is deactivated (Ref. AMM TASK 78-30-00-040-012).

4. Procedure
Subtask 36-11-53-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Overpressure Valve
(1) If you use the APU to energize the electrical circuits, stop the APU:

For GTCP 36-300 APU (Ref. AMM D/O 49-00-00-86)
For APS 3200 APU (Ref. AMM TASK 49-00-00-860-006)
For 131-9(A) APU (Ref. AMM TASK 49-00-00-860-009).

(2) In the cockpit, on the SD bleed page:
(a) Make sure that the pressure and the temperature of the bleed-air duct system are in ambient conditions.

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

WARNING: DO NOT TOUCH THE UNIT UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS WHEN YOU DO THE MAINTENANCE TASK(S).

CAUTION: USE A SECOND WRENCH TO APPLY COUNTER TORQUE TO THE UNION ON THE VALVE WHEN YOU CONNECT THE HP SENSE TUBE.

(3) Clean the component interfaces and the adjacent area.
(4) Do an inspection of the component interfaces and the adjacent area.
(5) Remove the protective covers from the valve (6) and the ducts.
(6) Install the valve (6) as follows:
(a) Install the valve (6) on the pneumatic line (1) (put the control mechanism in position at the rear).

NOTE: The arrow that shows the direction of the airflow points up.

CAUTION: MAKE SURE THAT THE SCREWS OF THE ATTACHMENT CLAMPS ON THE OVERPRESSURE VALVE ARE IN THE CORRECT POSITION. IF NOT, THE SCREWS CAN CAUSE DAMAGE TO THE FIREWALL OF THE THRUST REVERSER COWL.

(7) Install the clamps (2) and (5) as follows:
(a) Install the clamp (2) but do not fully tighten it:
1 Make sure that the clamp (2) is correctly attached at the 12 o'clock position.
(b) Put the pneumatic line (4) in position.
(c) Install the clamp (5) but do not fully tighten it:
1 Make sure that the clamp (5) is correctly attached at the 12 o'clock position.
(d) TORQUE the clamps (2) and (5) to between 85 and 75 lbf.in (0.96 and 0.85 m.daN )

(Ref. AMM TASK 70-23-00-911-001) or (Ref. AMM TASK 70-23-00-911-002).
(8) Remove the CAP-BLANKING from each electrical connector and receptacle.
(9) Make sure that all the electrical connections are clean and in the correct condition.
(10) Connect the electrical connector (3).

Subtask 36-11-53-420-050-B ** ON A/C NOT FOR ALL

A. Installation of the Overpressure Valve
(1) If you use the APU to energize the electrical circuits, stop the APU:

For GTCP 36-300 APU (Ref. AMM D/O 49-00-00-86)
For APS 3200 APU (Ref. AMM D/O 49-00-00-86)
For 131-9(A) APU (Ref. AMM TASK 49-00-00-860-009).

(2) In the cockpit, on the SD bleed page:
(a) Make sure that the pressure and the temperature of the bleed-air duct system are in ambient conditions.

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

WARNING: DO NOT TOUCH THE UNIT UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS WHEN YOU DO THE MAINTENANCE TASK(S).

CAUTION: USE A SECOND WRENCH TO APPLY COUNTER TORQUE TO THE UNION ON THE VALVE WHEN YOU CONNECT THE HP SENSE TUBE.

(3) Clean the component interfaces and the adjacent area.
(4) Do an inspection of the component interfaces and the adjacent area.
(5) Remove the protective covers from the valve (6) and the ducts.
(6) Remove the PLUG-BLANKING from each disconnected line end.
(7) Install the valve (6) on the pneumatic line (4) (put the control mechanism to the rear).

NOTE: The arrow that shows the direction of the airflow points up.

CAUTION: MAKE SURE THAT THE SCREWS OF THE ATTACHMENT CLAMPS ON THE OVERPRESSURE VALVE ARE IN THE CORRECT POSITION. IF NOT, THE SCREWS CAN CAUSE DAMAGE TO THE FIREWALL OF THE THRUST REVERSER COWL.

(8) Install the clamp (5) but do not tighten it fully.
(9) Put the duct (8) in position between the duct assembly (14) and the bleed pressure regulator valve (12).
(10) Install the duct assembly (14) (Ref. AMM TASK 36-11-49-400-014).
(11) Install the clamp (13).
(12) Attach the links (10) to the duct (8) with the screws (9) and the nuts (11) and tighten the nuts with your hand.
(13) Adjust the links (10) until there is no force on the ducts and the links.
(14) TORQUE the clamps (5) and (13) to between 85 and 75 lbf.in (0.96 and 0.85 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
(15) Tighten the nuts (11).
(16) Remove the CAP-BLANKING from each electrical connector and receptacle.
(17) Make sure that all the electrical connections are clean and in the correct condition.
(18) Connect the electrical connectors (1), (2), (3) and (7).

Subtask 36-11-53-480-052-A ** ON A/C NOT FOR ALL

B. Preparation for the leak test
(1) There are two possible procedures to find the location of a pneumatic joint air-leak:
(a) You can apply dry developer (Ref. AMM TASK 70-51-00-230-001) around the pneumatic joints.

NOTE: Apply dry developer only on the connections of the removed pneumatic components. Do not apply dry developer on all the pneumatic components.

(b) You can install FOIL - ALUMINUM around the pneumatic joint locations. Do the steps that follow to install foil, aluminum on the pneumatic joint locations:
1 Wind the foil around the joint one time.
2 Twist the seam of the foil wrap tight.
3 Make the foil wrap as tight as possible on the tube but do not cause damage to the wrap.
4 Attach the foil wrap with 14QEB1Wire-Locking Dia: 0.6 mm CRES Nickel Alloy - on the two sides of the pneumatic joint.

Subtask 36-11-53-480-052-B ** ON A/C NOT FOR ALL

B. Preparation for the leak test
(1) There are two possible procedures to find the location of a pneumatic joint air-leak:
(a) You can apply dry developer (Ref. AMM TASK 70-23-05-230-010) around the pneumatic joints.

NOTE: Apply dry developer only on the connections of the removed pneumatic components. Do not apply dry developer on all the pneumatic components.

Subtask 36-11-53-480-052-C ** ON A/C NOT FOR ALL

NOTE: Apply dry developer only on the connections of the removed pneumatic components. Do not apply dry developer on all the pneumatic components.

Subtask 36-11-53-710-050-A ** ON A/C NOT FOR ALL

C. Do this Test
(1) Do the BITE test of BMC 1(2) (Ref. AMM TASK 36-11-00-740-001).
(2) Do the operational test to do a check of the CURRENT STATUS of the engine /APU bleed/air system (Ref. AMM TASK 36-11-00-710-001) and make sure that BIT 11 of LABEL 067 (066) is at 0.
(3) Do the leak test: pressurize the bleed system with one of these sources: aire sources:
(a) The APU (Ref. AMM TASK 36-12-00-860-001) or
(b) The HP ground connector (Ref. AMM TASK 36-12-00-860-002).
(4) Make sure that there are no leaks at the joints between the overpressure valve, the sensor lines and the ducts on the related engine.

NOTE: There is a leak when the foil installed on the duct breaks or when it is too hot. There is a leak when the air removes the dry developer from the joint.

(5) Remove the materials used to do the leak test.

5. Close-up
Subtask 36-11-53-410-053-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) Close the left thrust reverser door (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 36-11-53-440-051-A ** ON A/C NOT FOR ALL

B. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041).

Subtask 36-11-53-410-050-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

Subtask 36-11-53-410-053-B ** ON A/C NOT FOR ALL

D. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser halves (Ref. AMM TASK 78-32-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 36-11-53-440-051-B ** ON A/C NOT FOR ALL

E. Activate the thrust reverser HCU (Ref. AMM TASK 78-30-00-440-012).

Subtask 36-11-53-410-050-B ** ON A/C NOT FOR ALL

F. Close Access
(1) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Remove the WARNING NOTICE(S).
(3) Remove the access platform(s).

Subtask 36-11-53-862-051-A ** ON A/C NOT FOR ALL

G. De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002) or (Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 01:13:17 UTC