Installation of the Bleed Pressure Regulating Valve (PRV)

TASK 36-11-52-400-042-A
Installation of the Bleed Pressure Regulating Valve (PRV)

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

FIN: 4001HA ** 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)-ADJUSTABLE
No specific	AR	HAMMER - FIBER
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 1.69 and 1.52 m.daN (12.46 and 11.21 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP5063)	silicone lubricant
(Material No.08BBD1)	Non Aqueous Cleaner-- Isopropyl Alcohol -
(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. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
15	SEALS	AIPC 36-11-52-02-040

E. 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 36-11-49-000-026-A	Removal of the Sense Line between the Bleed Pressure-Regulator Valve (PRV) and the Pylon Interface
TASK 36-11-49-400-026-A	Installation of the Sense Line between the Bleed Pressure-Regulator Valve (PRV) and the Pylon Interface
TASK 36-11-52-790-001-A	Leak Test of the Bleed-Pressure Regulator Valve with the Engine in Operation
TASK 36-11-52-790-001-A-03	Leak Test of the Bleed-Pressure Regulator Valve with the APU in Operation and with the Bleed Test Set P/N 98L36103002000
TASK 36-11-52-790-001-A-04	Leak Test of the Bleed-Pressure Regulator Valve with Ground Air-Supply Unit and with the Bleed Test Set P/N 98L36103002000
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 71-13-00-410-040-B	Closing of the Fan Cowl Doors
TASK 78-30-00-081-041-B	Make the Thrust Reverser Serviceable after Maintenance
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
TASK 78-36-00-410-040-B	Closing of the Thrust Reverser Doors
Bleed Pressure Regulator Valve
Duct Coupling Installation
Bleed Pressure Regulating Valve - Detail

3. Job Set-up
Subtask 36-11-52-860-061-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 engine 1(2) is shutdown for a minimum of five minutes before you do this procedure.
(3) In the cockpit, on AIR COND panel 30VU:

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

(4) On the center pedestal, on ENG panel 115VU:

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

(5) On the HP ground connector:

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

(6) On the ENG section of maintenance panel 50VU:

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

(7) Make sure that the ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE is in position below the engine.

Subtask 36-11-52-865-053-A ** ON A/C NOT FOR ALL

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
122VU	AIR BLEED/ENG 2/CTL	3HA2	Z23
122VU	AIR BLEED/ENG 2/MONG	2HA2	Z22

Subtask 36-11-52-010-065-A ** ON A/C NOT FOR ALL

C. 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 36-11-52-040-054-A ** ON A/C NOT FOR ALL

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

Subtask 36-11-52-020-070-A ** ON A/C NOT FOR ALL

E. Make sure that the sense line between the bleed Pressure-Regulator Valve (PRV) and the pylon interface is removed (Ref. AMM TASK 36-11-49-000-026).

4. Procedure
Subtask 36-11-52-110-053-A ** ON A/C NOT FOR ALL

A. Clean the Seals
(1) Clean the surface of the seals (15) with a USA AMS 3819 Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-- Isopropyl Alcohol - (Material No.08BBD1) .

Subtask 36-11-52-210-059-A ** ON A/C NOT FOR ALL

B. Visual Inspection of the Seals
(1) Examine the seals for signs of oxidation, carbon flakes and foreign materials on the face that touches the duct flanges.
(2) Examine the surface and the edges of the seals for dents, pitting, cracks, scratches and distortion.
(3) If you cannot remove the foreign materials from the seals or if you find damage or distortion, replace the seals.

Subtask 36-11-52-420-052-A ** ON A/C NOT FOR ALL

C. Installation of the PRV
(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 blanking plugs from the ends of the PRV (30), the interface duct (5) and the tee-duct (10).
(4) Remove the protective covers from the HP sense tube (25), the sense tube (35) and the PRV (30).

CAUTION: APPLY ONLY A THIN LAYER OF (CP5063) SILICON LUBRICANT TO THE THREADS OF THE HOSE TUBE ASSEMBLY COUPLING NUTS AND FITTING ON THE VALVES, AND REMOVE UNWANTED LUBRICANT. KEEP LUBRICANT FROM GOING INTO THE HOSE TUBE ASSEMBLY AND VALVES. IF TOO MUCH LUBRICANT IS USED, THEN LUBRICANT MAY CLOG THE HOSE TUBE ASSEMBLY AND ENTER THE VALVES AND DAMAGE THOSE COMPONENTS.

(5) Lubricate the threads of the coupling nuts and the fittings with silicone lubricant (Material No.CP5063) .
(6) Remove the protective covers from the electrical connectors on the wire harness.
(7) Install the PRV as follows:
(a) If the sense line is not removed in the removal procedure from the selector S-A position:

Bleed Pressure Regulating Valve - Detail ** ON A/C NOT FOR ALL

1 Make sure that the IPT/RPT plug is in the selector S-A position.

NOTE: If the IPT/RPT plug is not in the selector S-A position, you can remove the plug from the IPT/RPT plug storage-position and put the plug to the selector S-A position.

CAUTION: MAKE SURE THAT THE KEYWAY ON THE VALVE IS ENGAGED WITH THE KEY ON THE DUCT. IF THE POSITION OF THE KEYWAY IS NOT CORRECT, DAMAGE TO THE VALVE AND ITS PARTS CAN OCCUR.

(b) Put the PRV (30) in position between the tee-duct (10) and the interface duct (5).
(c) Make sure that the flow arrow on the valve points to the interface duct (5).
(8) Make sure that the sense tubes (25) and (35) and the unions are serviceable.
(9) Loosely attach the PRV (30) to the interface duct (5) and the tee-duct (10) with the couplings (20) and the AIPC 36-11-52-02-040 SEALS (15).
(a) Do not tighten the couplings at this time.
(10) Connect the HP sense tube (25) to the PRV (30):
(a) Make sure that the HP sense tube is in its correct installation position.

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

(11) TORQUE the coupling nut on the HP sense tube (25) to between 1.69 and 1.52 m.daN (12.46 and 11.21 lbf.ft )

.
(12) Connect the sense tube (35) to the PRV (30).

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

(13) TORQUE the coupling nut on the HP sense tube (35) to between 1.69 and 1.52 m.daN (12.46 and 11.21 lbf.ft )

.
(14) Do the steps that follow to torque the coupling nuts:

CAUTION: MAKE SURE THE SMOOTH CIRCULAR SURFACE OF THE COUPLING IS RADIALLY OUTBOARD FROM THE ENGINE. DO NOT LET THE COUPLING TOUCH ENGINE COMPONENTS OR STRUCTURE. DAMAGE TO THE COMPONENTS OR STRUCTURE COULD OCCUR.

(a) TORQUE the coupling nut to the value shown on the coupling.
(b) Use the HAMMER - FIBER and lightly hit the perimeter of the coupling.
(c) Do steps (b) thru (c) two more times.
(d) TORQUE the coupling nut to the value shown on the coupling.
(15) Connect the electrical connector to the PRV (30):
(a) Tighten the connector with your hand to the one-eighth turn.

Subtask 36-11-52-420-067-A ** ON A/C NOT FOR ALL

D. Install the sense line between the bleed Pressure-Regulator Valve (PRV) and the pylon interface (Ref. AMM TASK 36-11-49-400-026).

Subtask 36-11-52-865-054-A ** ON A/C NOT FOR ALL

E. 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
122VU	AIR BLEED/ENG 2/CTL	3HA2	Z23
122VU	AIR BLEED/ENG 2/MONG	2HA2	Z22

Subtask 36-11-52-720-056-A ** ON A/C NOT FOR ALL

F. Do the Leak Test of the Bleed Pressure Regulator Valve (4001HA) with the Engine in Operation (Ref. AMM TASK 36-11-52-790-001).

NOTE: As an alternative procedure, you can do this leak test without the engine in operation.

First method with the APU in operation (Ref. AMM TASK 36-11-52-790-001)
Second method with the ground air-supply unit (Ref. AMM TASK 36-11-52-790-001).

5. Close-up
Subtask 36-11-52-410-063-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) Close the thrust reverser doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
(3) Remove the access platform(s).

Subtask 36-11-52-440-057-A ** ON A/C NOT FOR ALL

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

Subtask 36-11-52-410-051-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 WARNING NOTICE(S).

Subtask 36-11-52-862-056-A ** ON A/C NOT FOR ALL

D. 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 01:12:41 UTC