Removal of the Sense Line between the Bleed Pressure-Regulator Valve (PRV) and the Pylon Interface

TASK 36-11-49-000-026-A
Removal of the Sense Line between the Bleed Pressure-Regulator Valve (PRV) and the Pylon Interface

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.

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.

1. Reason for the Job
This procedure is related to the removal of the third sense line located between the bleed Pressure-Regulator Valve (PRV) and the pylon interface.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE
No specific	AR	FOIL - ALUMINUM
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
No specific	AR	WRENCH - STANDARD
No specific	Torque wrench: range to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )
No specific	Torque wrench: range to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03PBB1)	Lubricant-Anti Seize High Temp. -
(Material No.03QBC1)	Dry lubricant-General Assembly Molybdenum Disulfide & Silicone -
(Material No.08BBE1)	Non Aqueous Cleaner-- Methyl Alcohol -
(Material No.14QEB1)	Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
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 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 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 78-30-00-481-041-B	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-B	Opening of the Thrust Reverser Doors
Sense Line between the Bleed Pressure Regulator Valve (PRV) and the Pylon Interface ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 36-11-49-861-095-A ** ON A/C NOT FOR ALL

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

Subtask 36-11-49-941-112-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(2) On the 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 the 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 the ENG section of the 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 the FADEC 1(2).

Subtask 36-11-49-865-148-A ** ON A/C NOT FOR ALL

C. Open, safety and tag 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
122VU	AIR BLEED/ENG 2/CTL	3HA2	Z23
122VU	AIR BLEED/ENG 2/MONG	2HA2	Z22

Subtask 36-11-49-010-167-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(2) Put an ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position below the applicable engine.

Subtask 36-11-49-040-124-A ** ON A/C NOT FOR ALL

E. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 36-11-49-010-168-A ** ON A/C NOT FOR ALL

F. Open the thrust reverser cowl doors (Ref. AMM TASK 78-36-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

4. Procedure
Subtask 36-11-49-020-113-A ** ON A/C NOT FOR ALL

A. Removal of the Sense Line between the Bleed PRV and the Pylon Interface
(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).

(3) Remove the screw (4), the washer (5) and the nut (9) from the valve (1).
(4) Attach the clamp (6) on the sense line (3).
(5) Disconnect the sense line (3) between the port (12) of the pylon interface and the port (2) of the valve (1) as follows:.
(a) Loosen the pneumatic unions a quarter turn with a WRENCH - STANDARD.
(b) Remove the unions with your hand to prevent damage to the fitting end of the sense line (3).
(c) Disconnect and remove the sense line (3).
(d) Put blanking plugs on the disconnected line ends.
(6) Remove the plug (10) from the storage port (11) of the pylon interface.
(7) Clean the threads of the port (12) with a lint-free cotton cloth Textile-Lint free Cotton - (Material No.14SBA1) and Non Aqueous Cleaner-- Methyl Alcohol - (Material No.08BBE1) .

CAUTION: BEFORE YOU APPLY LUBRICANT, PUT TAPE ON THE UNION HOLES OF THE VALVE AND THE PYLON INTERFACE TO PREVENT LUBRICANT CONTAMINATION OF THE PNEUMATIC CONNECTION.

CAUTION: APPLY ONLY A THIN LAYER OF GREASE TO THE THREADS OF THE HOSE-ASSEMBLY COUPLING NUTS, AND REMOVE THE UNWANTED GREASE TO PREVENT CONTAMINATION OF THE HOSE ASSEMBLY. IF YOU USE TOO MUCH GREASE, IT CAN CAUSE CLOGGING OF THE HOSE ASSEMBLY OR DAMAGE TO THE RELATED COMPONENTS.

(8) Apply a thin layer of Dry lubricant-General Assembly Molybdenum Disulfide & Silicone - (Material No.03QBC1) or Lubricant-Anti Seize High Temp. - (Material No.03PBB1) to the threads of the port (12).

NOTE: Apply lubricating material in the pylon interface port (12) before installation of the plug (10) to prevent clogging.

(9) Put the plug (10) in position on the port (12) of the pylon interface.

WARNING: TIGHTEN THE PLUG(S) TO THE CORRECT TORQUE VALUE. IF YOU DO NOT TIGHTEN THEM SUFFICIENTLY, HOT AIR LEAKAGE CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.

(10) TORQUE the plug (10) to between 3.2 and 2.9 m.daN (23.60 and 21.39 lbf.ft )

.
(11) Remove the plug (7) from the storage port (8) of the valve (1).
(12) Clean the threads of the port (2) with a lint-free cotton cloth Textile-Lint free Cotton - (Material No.14SBA1) and Non Aqueous Cleaner-- Methyl Alcohol - (Material No.08BBE1) .

CAUTION: BEFORE YOU APPLY LUBRICANT, PUT TAPE ON THE UNION HOLES OF THE VALVE AND THE PYLON INTERFACE TO PREVENT LUBRICANT CONTAMINATION OF THE PNEUMATIC CONNECTION.

(13) Apply a thin layer of Dry lubricant-General Assembly Molybdenum Disulfide & Silicone - (Material No.03QBC1) or Lubricant-Anti Seize High Temp. - (Material No.03PBB1) to the threads of the port (2).

NOTE: Apply lubricating material in the valve port (2) before installation of the plug (7) to prevent clogging.

(14) Put the plug (7) in position on the port (2) of the valve (1).
(15) TORQUE the plug (7) to between 1.7 and 1.5 m.daN (12.54 and 11.06 lbf.ft )

Subtask 36-11-49-480-062-A ** ON A/C NOT FOR ALL

B. Prepare for the leak test
(1) Do the steps that follow to install FOIL - ALUMINUM on the pylon interface around the plug:

Wind the foil wrap around the joint one time.
Twist the seam of the foil wrap tight.
Make the foil wrap as tight as possible on the tube but do not cause damage to the wrap.
Attach the foil wrap at the two sides of the pneumatic joint with 14QEB1Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -.

[Rev.10 from 2021] 2026.04.01 01:10:42 UTC