Functional Test of the Pressure Regulator Valve (PRV) with the Bleed Test Set P/N 99127B04 and the Bleed Test Kit P/N 99127-281

TASK 36-11-52-720-812-A-01
Functional Test of the Pressure Regulator Valve (PRV) with the Bleed Test Set P/N 99127B04 and the Bleed Test Kit P/N 99127-281

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: 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.

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

WARNING: BEFORE YOU INSTALL/REMOVE THE GSE TOOL, READ THE MANUFACTURER'S INSTRUCTIONS, AND, WHILE YOU OPERATE THIS TOOL, CAREFULLY OBEY THEM. IF YOU DO NOT DO THIS, INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.

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

CAUTION: BE CAREFUL WHEN YOU CONNECT/DISCONNECT THE TEST SET TO/FROM THE EQUIPMENT. THE PRESSURE REGULATING VALVE AND THE PRESSURE GAGE ASSEMBLY OF THE TEST SET ARE HEAVY AND CAN CAUSE DAMAGE TO THE ENGINE.

ZONE: 438
ZONE: 448
ZONE: 452
ZONE: 462
FIN: 4001HA1
FIN: 4001HA2

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	1	AIR SOURCE - REGULATED, FILTERED, DRY
No specific	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	SUPPLY - 28 VDC, ELECTRICAL
No specific	AR	WARNING NOTICE(S)
No specific	1	WRENCH - STANDARD
No specific	Torque wrench: range to between 2.2 and 1.8 m.daN (16.22 and 13.27 lbf.ft )
99127-281	1	BLEED TEST KIT
99127B04	1	BLEED TEST SET

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.14QFB1)	Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
438	FAN COWL
448	FAN COWL
452	THRUST REVERSER
462	THRUST REVERSER
FOR [1000EM1] (ENGINE-1)
438AR, 452AR
FOR [1000EM2] (ENGINE-2)
448AR, 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 24-41-00-861-002-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 36-11-00-740-804-A	BITE Test of the Engine Bleed Air System (EBAS) (System Test)
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 78-30-00-040-809-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-809-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A	Closing of the Thrust Reverser Cowl Doors
PRV with the Bleed Test Set P/N 99127B04 and the Bleed Test Kit P/N 99127-281

3. Job Set-up
Subtask 36-11-52-861-122-A

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

Subtask 36-11-52-941-128-A

B. Safety Precautions
(1) Make sure that engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(2) On ENG panel 115VU:

Make sure that the ENG/MODE selector switch is in the NORM position.
Make sure that ENG/MASTER 1(2) control switch is in the OFF position.
Put a WARNING NOTICE(S) in position to tell persons not to start engine 1(2).

(3) 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.
Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

(4) On AIR COND panel 30VU:

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

(5) On the HP ground connector:

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

Subtask 36-11-52-865-099-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	AIR BLEED/APU BLEED VLV CTL/BMC1 OVRD	11HV	D14
49VU	AIR BLEED/X FEED/VALVE/BAT	2HV	D13
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
122VU	AIR BLEED/X FEED VALVE/NORM	1HV	Z20
122VU	AIR BLEED/APU BLEED VLV CTL/BMC2 OVRD	12HV	Z19

Subtask 36-11-52-010-215-A

D. Get Access
(1) Open the right fan cowl-doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [1000EM1] (ENGINE-1)
438AR
(b) FOR [1000EM2] (ENGINE-2)
448AR.

Subtask 36-11-52-040-137-A

E. Deactivation of the Thrust Reverser System

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 (Ref. AMM TASK 78-30-00-040-809).

Subtask 36-11-52-010-216-A

F. Get Access
(1) Open the right thrust-reverser doors (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [1000EM1] (ENGINE-1)
452AR
(b) FOR [1000EM2] (ENGINE-2)
462AR.
(2) Put an ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position below the applicable engine.

4. Procedure
Subtask 36-11-52-750-054-A

A. Manual Test of the PRV
(1) On the valve position indicator, record the position of the butterfly valve.
(2) Make sure that the butterfly valve moves freely:

On the position indicator, use a WRENCH - STANDARD to fully open and to fully close the butterfly valve.
Put the butterfly valve in the initial position that you recorded.

Subtask 36-11-52-480-140-A

B. Preparation for the Functional Test of the PRV
(1) Use the 99127B04 BLEED TEST SET (T01) with the 99127-281 BLEED TEST KIT to do this test.
(2) On the 99127B04 BLEED TEST SET (T01), make sure that:

Pressure control knobs P1 (2) and P2 (3) are turned fully counterclockwise
The handles of the shut-off valves (6) and (7) are in the OFF position
The switches (24) and (25) are in position 2 (OFF)
The knob (38) is in position 0
The stopwatch switch (19) is down (OFF)
The multimeter knob (41) is in the OFF (vertical) position
The multimeter switch (28) is in position 0
The POWER SUPPLY knob (35) is turned fully counterclockwise
The SQUARE SIGNAL switch (34) is in the OFF position
The TORQUE MOTOR switch (33) is in the OFF position
The POWER switch (31) is in the OFF position.

(3) Connection of the pneumatic hoses (T04) and (T05):

CAUTION: ONLY USE PNEUMATIC HOSES T04 AND T05 FROM THE LIEBHERR BLEED TEST SET 99127-B04. IF YOU USE DIFFERENT PNEUMATIC HOSES, YOU WILL GET INCORRECT TEST RESULTS.

(a) Make sure that you use the pneumatic hoses (T04) and (T05) available in the 99127B04 BLEED TEST SET (T01).
(b) Make sure that the AIR SOURCE - REGULATED, FILTERED, DRY is set to 0 psi (0.00 bar).
(c) Connect the AIR SOURCE - REGULATED, FILTERED, DRY to the pressure supply port (1) of the 99127B04 BLEED TEST SET (T01) and the pneumatic supply connector (T02).
(4) Connect the yellow pneumatic hose (T04) between the Y-adaptor (T06) and the pressure outlet (9) of the 99127B04 BLEED TEST SET (T01).
(5) Connect the red pneumatic hose (T05) between the Y-adaptor (T06) and the pressure outlet (14) of the 99127B04 BLEED TEST SET (T01).
(6) Connect the Y-adaptor (T06) to the test port adaptor (T14) or (T25).
(7) Removal of the lockwire:

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

(a) Cut, remove and discard the lockwire from the test port screw of the PRV.
(8) Remove the test port screw from the test port of the PRV.
(9) Connect the test port adaptor (T30):
(a) Connect the test port adaptor (T30) to the test port of the PRV with your hand.
(10) Connect the test port adaptor (T14) or (T25) to the test port adaptor (T30).

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.

(11) Disconnect electrical connector 4000HA1-A (4000HA2-A) from the PRV.
(12) Put a CAP - BLANKING on electrical connector 4000HA1-A (4000HA2-A).

CAUTION: MAKE SURE THAT:

YOU DO NOT APPLY HIGH LOADS WHEN YOU ENGAGE THE TEST PORT ADAPTOR IN THE VALVE OR THE SENSOR
YOU TIGHTEN THE ADAPTOR MANUALLY. IF YOU APPLY A LOAD THAT IS TOO HIGH, DAMAGE TO THE PIN OF THE TEST PORT ADAPTOR CAN OCCUR.

(13) Connect the PRV electrical connector (T13) between the PRV and the test set connector (12) of the 99127B04 BLEED TEST SET (T01) with your hand.
(14) Connect the 28VDC electrical cord (T03) between the electrical inlet (11) of the 99127B04 BLEED TEST SET (T01) and an external SUPPLY - 28 VDC, ELECTRICAL.
(a) Start the SUPPLY - 28 VDC, ELECTRICAL.
(15) Push the pushbutton (26) and make sure that lights come on from (15) to (21).
(16) Set the digital pressure gage (5) to ON:
(a) Make sure that the pressure value shown on the digital pressure gage (5) is equal to 0 psi (0.00 bar).
(b) If it is not equal to 0 psi (0.00 bar), push and hold the ON/OFF button for 10 seconds.
(17) Pressurize the 99127B04 BLEED TEST SET (T01):

WARNING: BE CAREFUL WHEN YOU PRESSURIZE THE BLEED TEST SET. THE MAXIMUM PRESSURE PERMITTED BY THE BLEED TEST SET IS 290 PSI. PRESSURE HIGHER THAN THE PRESSURE PERMITTED BY THE EQUIPMENT CAN CAUSE INJURY TO PERSONNEL AND/OR DAMAGE TO EQUIPMENT.

(a) Pressurize the 99127B04 BLEED TEST SET (T01) with the AIR SOURCE - REGULATED, FILTERED, DRY to between 100 psi (6.89 bar) and 200 psi (13.79 bar).

Subtask 36-11-52-720-138-A

C. Functional Test of the PRV
(1) Do this test:

ACTION	RESULT
1.On the 99127B04 BLEED TEST SET (T01): Set the POWER switch (31) to the ON position Set the SQUARE SIGNAL switch (34) to the ON position Set the TORQUE MOTOR switch (33) to the ON position.	On the 99127B04 BLEED TEST SET (T01): The VOLTAGE indicator (37) and the CURRENT indicator (36) come on The electrical current shown must be less than 40 mA.
2.On the 99127B04 BLEED TEST SET (T01): Open the shut-off valve (7) Slowly turn the pressure control knob (3) to increase the pressure to 15 psi (1.03 bar).	On the 99127B04 BLEED TEST SET (T01): The digital pressure gage (5) shows 15 psi (1.03 bar). On the PRV: The position indicator shows CLOSED.
3.On the 99127B04 BLEED TEST SET (T01): Turn the POWER SUPPLY knob (35) to supply an electrical current between 395 and 405 mA.	On the PRV: The position indicator shows OPEN.
4.On the 99127B04 BLEED TEST SET (T01): Turn the POWER SUPPLY knob (35) to supply an electrical current less than 40 mA.	On the PRV: The position indicator shows CLOSED.
5.On the 99127B04 BLEED TEST SET (T01): Slowly turn the pressure control knob (3) to decrease the pressure to 0 psi (0.00 bar). Set the shut-off valve (7) to the OFF position.	On the 99127B04 BLEED TEST SET (T01): The digital pressure gage (5) shows 0 psi (0.00 bar). On the PRV: The position indicator shows CLOSED.
6.On the 99127B04 BLEED TEST SET (T01): Set the POWER switch (31) to the OFF position Set the SQUARE SIGNAL switch (34) to the OFF position Set the TORQUE MOTOR switch (33) to the OFF position.	On the 99127B04 BLEED TEST SET (T01): The VOLTAGE indicator (37) and the CURRENT indicator (36) go off.

Subtask 36-11-52-080-138-A

D. Disconnection of the Test Set

WARNING: BEFORE YOU START TO REMOVE THE TOOLING, MAKE SURE THAT THERE IS NO PRESSURIZED GAS LEFT INSIDE THE DUCTS. IT CAN CAUSE AN INJURY TO PERSONNEL AND/OR DAMAGE TO EQUIPMENT.

(1) Stop the SUPPLY - 28 VDC, ELECTRICAL.
(2) Close the shut-off valve of the AIR SOURCE - REGULATED, FILTERED, DRY to decrease the pressure of the 99127B04 BLEED TEST SET (T01) to 0 psi (0.00 bar).
(3) Disconnect the test port adaptor (T30) from the PRV.
(4) Install the test port screw on the test port of the PRV.
(5) TORQUE the test port screw to between 2.2 and 1.8 m.daN (16.22 and 13.27 lbf.ft )

.
(6) Installation of the lockwire:

(a) Safety the test port screw with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(7) Disconnect the PRV electrical connector (T13) from the PRV.
(8) Remove the CAP - BLANKING from electrical connector 4000HA1-A (4000HA2-A).

CAUTION: MAKE SURE THAT ELECTRICAL CONNECTORS ARE CLEAN WHEN YOU CONNECT THEM. THE CONTAMINATION OF ELECTRICAL CONNECTORS CAN CAUSE DAMAGE TO THE EQUIPMENT.

(9) Connect electrical connector 4000HA1-A (4000HA2-A) to the PRV and tighten it with your hand.
(10) Disconnect the PRV electrical connector (T13) from the 99127B04 BLEED TEST SET (T01).
(11) Disconnect the test port adaptor (T14) or (T25) from the Y-adaptor (T06) and the test port adaptor (T30).
(12) Disconnect the pneumatic hoses (T04) and (T05) from the 99127B04 BLEED TEST SET (T01) and the Y-adaptor (T06).
(13) Disconnect the pneumatic supply connector (T02) from the 99127B04 BLEED TEST SET (T01) and the AIR SOURCE - REGULATED, FILTERED, DRY.
(14) Disconnect the 28VDC electrical cord (T03) from the SUPPLY - 28 VDC, ELECTRICAL and the 99127B04 BLEED TEST SET (T01).
(15) Disconnect the pneumatic supply connector (T02) from the AIR SOURCE - REGULATED, FILTERED, DRY and the pressure supply port (1) of the 99127B04 BLEED TEST SET (T01).
(16) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

Subtask 36-11-52-865-100-A

E. 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/APU BLEED VLV CTL/BMC1 OVRD	11HV	D14
49VU	AIR BLEED/X FEED/VALVE/BAT	2HV	D13
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
122VU	AIR BLEED/X FEED VALVE/NORM	1HV	Z20
122VU	AIR BLEED/APU BLEED VLV CTL/BMC2 OVRD	12HV	Z19

Subtask 36-11-52-740-052-A

F. Test
(1) Do the BITE test of the Engine Bleed Air System (EBAS) (Ref. AMM TASK 36-11-00-740-804).

5. Close-up
Subtask 36-11-52-410-204-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform(s).
(3) Close the right thrust-reverser doors (Ref. AMM TASK 78-36-00-410-806):
(a) FOR [1000EM1] (ENGINE-1)
452AR
(b) FOR [1000EM2] (ENGINE-2)
462AR.

Subtask 36-11-52-440-126-A

B. Do the reactivation of the thrust reverser system (Ref. AMM TASK 78-30-00-440-809).

Subtask 36-11-52-410-205-A

C. Close Access
(1) Close the right fan cowl-doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [1000EM1] (ENGINE-1)
438AR
(b) FOR [1000EM2] (ENGINE-2)
448AR.
(2) Remove the WARNING NOTICE(S).

Subtask 36-11-52-862-119-A

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

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