Functional Test of the Overpressure Valve (OPV) with the Bleed Test Set P/N 99127B04 and the Bleed Test Kit P/N 99127-281

TASK 36-11-53-720-803-A-01
Functional Test of the Overpressure Valve (OPV) with the Bleed Test Set P/N 99127B04 and the Bleed Test Kit P/N 99127-281

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.

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: 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.

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: 413
ZONE: 414
ZONE: 423
ZONE: 424
FIN: 7115HM1
FIN: 7115HM2

1. Reason for the Job
Refer to the MPD TASK: 361100-03
FUNCTIONAL CHECK OF OVERPRESSURE VALVE.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE
No specific	1	AIR SOURCE - REGULATED, FILTERED, DRY
No specific	1	SUPPLY - 28 VDC, ELECTRICAL
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 1.6 and 1.5 m.daN (11.80 and 11.06 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
413	UPPER FWD PYLON
414	UPPER FWD PYLON
423	UPPER FWD PYLON
424	UPPER FWD PYLON
FOR [1000EM1] (ENGINE-1)
413CT
FOR [1000EM2] (ENGINE-2)
423CT

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)
OPV with the Bleed Test Set P/N 99127B04 and the Bleed Test Kit P/N 99127-281

3. Job Set-up
Subtask 36-11-53-861-062-A

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

Subtask 36-11-53-941-065-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 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).
Put a WARNING NOTICE(S) in position to tell persons not to operate the pneumatic system.

(3) On ENG panel 115VU:

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

(4) On the HP ground connector:

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

(5) 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).

Subtask 36-11-53-865-068-A

C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

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 36-11-53-010-076-A

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

4. Procedure
Subtask 36-11-53-750-054-A

A. Manual Test of the OPV
(1) On the OPV 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 fully close the butterfly valve.
Put the butterfly valve in the initial position that you recorded.

Subtask 36-11-53-480-059-A

B. Preparation for the Functional Test of the OPV
(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) Connect 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 (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 blanking plug of the OPV.
(8) Remove the blanking plug from the test port of the OPV.
(9) Connect the test port adaptor (T31):
(a) Connect the test port adapter (T31) to the test port of the bleed OPV with your hand.
(10) Connect the port adaptor (T25) to the test port adaptor (T31).
(11) 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.
(12) Push the pushbutton (26) and make sure that lights come on from (15) to (21).
(13) 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.
(14) 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)
(b) Set the digital pressure gage (5) back to zero.

Subtask 36-11-53-720-088-A

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

ACTION	RESULT
1.On the OPV: Do a visual check of the visual indicator.	On the OPV: The visual indicator shows that the OPV is open.
2.On the 99127B04 BLEED TEST SET (T01): Set the shut-off valve (7) to open Slowly turn the pressure control knob (3) to increase the pressure to 95 psi (6.55 bar).	On the 99127B04 BLEED TEST SET (T01): The digital pressure gage (5) shows 95 psi (6.55 bar). On the OPV: The position indicator shows CLOSED.
3.On the 99127B04 BLEED TEST SET (T01): Slowly turn the regulator knob (3) to reduce the pressure.	On the 99127B04 BLEED TEST SET (T01): On the pressure gage, when the pressure is less than 43 psi (2.96 bar), the visual position indicator shows that the OPV is open.
4.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 OPV: The position indicator keeps OPEN.

Subtask 36-11-53-080-056-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 (T31) from the OPV.
(4) Install the blanking plug on the test port of the OPV.
(5) TORQUE the blanking plug to between 1.6 and 1.5 m.daN (11.80 and 11.06 lbf.ft )

.
(6) Installation of the lockwire:

(a) Safety the blanking plug with 14QFB1Wire-Locking Dia: 0.8 mm CRES Nickel Alloy -.
(7) Disconnect the test port adaptor (T25) from the Y-adaptor (T06) and the port adaptor (T31).
(8) Disconnect the pneumatic hoses (T04) and (T05) from the 99127B04 BLEED TEST SET (T01) and the Y-adaptor (T06).
(9) Disconnect the pneumatic supply connector (T02) from the 99127B04 BLEED TEST SET (T01) and the AIR SOURCE - REGULATED, FILTERED, DRY.
(10) Disconnect the 28VDC electrical cord (T03) from the SUPPLY - 28 VDC, ELECTRICAL and the 99127B04 BLEED TEST SET (T01).
(11) Disconnect the pneumatic supply connector (T02) from the AIR SOURCE - REGULATED, FILTERED, DRY and the 99127B04 BLEED TEST SET (T01) pressure input (1).
(12) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

5. Close-up
Subtask 36-11-53-410-068-A

A. 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).

Subtask 36-11-53-865-069-A

B. 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 36-11-53-862-059-A

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

[Rev.10 from 2021] 2026.04.01 01:13:30 UTC