Deactivation of the Overpressure Valve

TASK 36-11-00-040-812-A
Deactivation of the Overpressure Valve

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: YOU MUST NOT TOUCH HOT PARTS WITHOUT APPLICABLE GLOVES. HOT PARTS CAN CAUSE AN INJURY.

WARNING: BEFORE YOU START WORK, YOU MUST PUT ON A SAFETY HARNESS AND ATTACH IT TO THE ACCESS PLATFORM. WITHOUT A SAFETY HARNESS, YOU CAN FALL. THIS CAN KILL YOU OR CAUSE YOU INJURY.

WARNING: MAKE SURE THAT THE SAFETY DEVICES AND THE WARNING NOTICES ARE IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

FIN: 7115HM1
FIN: 7115HM2

1. Reason for the Job
MMEL 36-11-03C
ENGINE BLEED OVERPRESSURE VALVE
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
No specific	1	WRENCH - HEXAGONAL
No specific	Torque wrench: range to between 5 and 4 m.daN (36.87 and 29.50 lbf.ft )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
413CT
FOR [1000EM2] (ENGINE-2)
423CT

C. 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 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
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 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 78-30-00-040-807-A	Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU)
TASK 78-30-00-440-807-A	Reactivation of the Thrust Reverser System after Nacelle Maintenance (ICU)
Overpressure Valve

3. Job Set-up
Subtask 36-11-00-861-160-A

A. Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 36-11-00-941-151-A

B. Safety Precautions
(1) Make sure that the shutdown of engine 1(2) occurred a minimum of five minutes before you do the procedure.
(2) On AIR COND panel 30VU:

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

(3) On ENG panel 115VU:

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

(4) On the HP ground connector:

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

(5) On maintenance panel 50VU:

Make sure that the ON legend of the ENG/FADEC GND PWR 1(2) pushbutton switch is off.
Put a WARNING NOTICE(S) to tell persons not to energize FADEC 1(2).

Subtask 36-11-00-865-154-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AIR BLEED/ENG 2/MONG	3HA2	D12
49VU	AIR BLEED/ENG 1/CTL	2HA1	D11
122VU	AIR BLEED/ENG 1/MONG	3HA1	Z23
122VU	AIR BLEED/ENG 2/CTL	2HA2	Z22

Subtask 36-11-00-010-195-A

D. Get Access
(1) Put the ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE in position below the engine.
(2) Remove the access panels:
(a) FOR [1000EM1] (ENGINE-1)
413CT
(b) FOR [1000EM2] (ENGINE-2)
423CT.

Subtask 36-11-00-040-134-A

E. Deactivation of the Thrust Reverser

WARNING: MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(1) Make the thrust reverser unserviceable for maintenance (Ref. AMM TASK 78-30-00-040-807).

4. Procedure
Subtask 36-11-00-040-132-A

A. Deactivation of the Overpressure Valve

WARNING: DO NOT TOUCH THE BLEED VALVE COMPONENTS FOR A SHORT TIME AFTER THE ENGINE IS SHUTDOWN. THE ENGINE COMPONENTS STAY HOT FOR SOME TIME AND CAN CAUSE INJURY.

CAUTION: CAREFULLY ALIGN THE LOCKING PIN WITH THE DEACTIVATING HOUSING ON THE VALVE. IF YOU ALIGN IT INCORRECTLY OR IF YOU TIGHTEN IT TOO MUCH, THE LOCKING PIN CAN REMAIN IN POSITION AND YOU CAN CAUSE DAMAGE TO THE LOCKING PIN THREAD.

(1) On the overpressure valve:
(a) Make sure that the valve position indicator shows OPEN.

If the valve position indicator does not show OPEN, use a WRENCH - HEXAGONAL to turn the position indicator to OPEN.

(2) Loosen the locking pin (1) from the storage port.
(3) Lock the manual override control with the locking pin (1).
(4) TORQUE the locking pin (1) to between 5 and 4 m.daN (36.87 and 29.50 lbf.ft )

5. Close-up
Subtask 36-11-00-440-123-A

A. Reactivation of the Thrust Reverser
(1) Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-440-807).

Subtask 36-11-00-410-184-A

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panels:
(a) FOR [1000EM1] (ENGINE-1)
413CT
(b) FOR [1000EM2] (ENGINE-2)
423CT.
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).
(5) Put the aircraft back to its initial configuration.

Subtask 36-11-00-865-155-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AIR BLEED/ENG 2/MONG	3HA2	D12
49VU	AIR BLEED/ENG 1/CTL	2HA1	D11
122VU	AIR BLEED/ENG 1/MONG	3HA1	Z23
122VU	AIR BLEED/ENG 2/CTL	2HA2	Z22

Subtask 36-11-00-869-130-A

D. Make an entry in the logbook.

Subtask 36-11-00-862-140-A

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

[Rev.10 from 2021] 2026.04.01 01:06:38 UTC