DOC AIRBUS | AMM A320FRemoval of the Bleed-Pressure Regulator Valve (PRV)
TASK 36-11-52-000-804-A
Removal of the Bleed-Pressure Regulator Valve (PRV)
Two persons are necessary to do this task
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 36-11-52-861-118-A
Subtask 36-11-52-020-077-A
[Rev.10 from 2021]
2026.04.01 12:38:11 UTC
Removal of the Bleed-Pressure Regulator Valve (PRV)
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 JobTwo persons are necessary to do this task
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE |
| No specific | AR | CAP - BLANKING |
| No specific | AR | PLUG - BLANKING |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| No specific | AR | WARNING NOTICE(S) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 454 | HOT SECTION |
| 464 | HOT SECTION |
| 191DB | |
| FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1) | |
| 437AL, 438AR, 452AR | |
| FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2) | |
| 447AL, 448AR, 462AR | |
| 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 36-11-49-000-831-A | Removal of the Indicating Tubes on the Environmental Control System (ECS) Ducts |
| 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 71-13-00-010-803-A | Opening of the Fan Cowl Doors |
| TASK 78-30-00-040-807-A | Deactivation of the Thrust Reverser System for Nacelle Maintenance (ICU) |
| TASK 78-36-00-010-806-A | Opening of the Thrust Reverser Cowl Doors |
Bleed-Pressure Regulator ValveSubtask 36-11-52-861-118-A
A. Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002) or (Ref. AMM TASK 24-41-00-861-002).
Subtask 36-11-52-941-123-A (Ref. AMM TASK 24-41-00-861-002) or (Ref. AMM TASK 24-41-00-861-002).
B. Safety Precautions
(1) Make sure that the engine 1(2) shutdown occurred not less than five minutes before you do this procedure.
(2) On AIR COND panel 30VU:
(a) Make sure that the ENG 1(2) BLEED pushbutton switch is released (OFF legend on).
(b) Make sure that the APU BLEED pushbutton switch is released (ON legend off).
(c) Put a WARNING NOTICE(S) in position to tell persons not to operate the pneumatic system.
(3) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put a WARNING NOTICE(S) in position to tell persons not to operate the ENG/MODE selector switch and the ENG/MASTER 1(2) control switch.
(4) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
(5) On access door 191DB, on the HP ground connector:
(a) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the pneumatic system.
Subtask 36-11-52-865-088-A (1) Make sure that the engine 1(2) shutdown occurred not less than five minutes before you do this procedure.
(2) On AIR COND panel 30VU:
(a) Make sure that the ENG 1(2) BLEED pushbutton switch is released (OFF legend on).
(b) Make sure that the APU BLEED pushbutton switch is released (ON legend off).
(c) Put a WARNING NOTICE(S) in position to tell persons not to operate the pneumatic system.
(3) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put a WARNING NOTICE(S) in position to tell persons not to operate the ENG/MODE selector switch and the ENG/MASTER 1(2) control switch.
(4) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
(5) On access door 191DB, on the HP ground connector:
(a) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the pneumatic system.
C. Open, safety and tag this(these) circuit breaker(s):
Subtask 36-11-52-010-204-A | 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 |
D. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR
Subtask 36-11-52-040-133-A (1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR
E. Deactivation of the Thrust Reverser for Nacelle Maintenance
Subtask 36-11-52-010-205-A WARNING:
YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.
(1) Do the deactivation of the thrust reverser system for nacelle maintenance (Ref. AMM TASK 78-30-00-040-807). F. Get Access
(1) Open the right thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
462AR
(2) Put an ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position.
4. Procedure(1) Open the right thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
462AR
(2) Put an ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position.
Subtask 36-11-52-020-077-A
A. Removal of the PRV
(1) If you use the APU to energize the electrical circuits, stop the APU:
(a) Make sure that the pressure and the temperature of the bleed-air duct system are in ambient conditions.
(4) Disconnect the indicating tube (12) from the ECS Y-Duct (10) and the High Pressure Valve (HPV) (Ref. AMM TASK 36-11-49-000-831).
(5) Disconnect the ECS harness-assembly connector (2) from the PRV (11).
(6) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(7) Disconnect the PRV muscle sense-tube (3) from the PRV (11) (Ref. AMM TASK 36-11-49-000-831).
(8) Record the position of the V-band couplings (6) and (8) before you remove them.
(9) Hold the PRV (11) and remove the two V-band couplings (6) and (8).
(11) Remove the PRV (11) from the engine.
(12) Remove and discard the seals (5) and (9).
(13) Put the PLUG-BLANKING in each disconnected line end.
(14) Put the PLUG - BLANKING on all the openings of the PRV (11).
(15) Make sure that the work area is clean and clear of tools and other items.
(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).
(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:
MAKE SURE THAT THE ELECTRICAL CONNECTORS ARE CLEAN BEFORE YOU DISCONNECT OR CONNECT THEM. CONTAMINATION ON THE ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO EQUIPMENT.
(3) Disconnect the muscle sense tube (1) from the Environmental Control System (ECS) Y-duct (10) (Ref. AMM TASK 36-11-49-000-831). (4) Disconnect the indicating tube (12) from the ECS Y-Duct (10) and the High Pressure Valve (HPV) (Ref. AMM TASK 36-11-49-000-831).
(5) Disconnect the ECS harness-assembly connector (2) from the PRV (11).
(6) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(7) Disconnect the PRV muscle sense-tube (3) from the PRV (11) (Ref. AMM TASK 36-11-49-000-831).
(8) Record the position of the V-band couplings (6) and (8) before you remove them.
(9) Hold the PRV (11) and remove the two V-band couplings (6) and (8).
NOTE: The V-band couplings (6) and (8) attach the PRV (11) to the ECS Y-duct (10) and the ECS pylon duct (4).
(10) Move the ECS Y-duct (10) and the ECS pylon duct (4) a small distance to get a clearance between them. (11) Remove the PRV (11) from the engine.
(12) Remove and discard the seals (5) and (9).
(13) Put the PLUG-BLANKING in each disconnected line end.
(14) Put the PLUG - BLANKING on all the openings of the PRV (11).
(15) Make sure that the work area is clean and clear of tools and other items.