Installation of the Pressure Regulating Valve

TASK 21-63-52-400-001-A
Installation of the Pressure Regulating Valve

WARNING: MAKE SURE THAT AIR IS NOT SUPPLIED TO THE AIR CONDITIONING SYSTEM FROM THE MAIN ENGINE, THE APU OR A GROUND SOURCE. HOT COMPRESSED AIR CAN CAUSE INJURY TO PERSONNEL.

WARNING: MAKE SURE THAT THE COMPONENTS OF THE BLEED AIR SYSTEM ARE COOL. HOT COMPONENTS WILL BURN YOU.

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 USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

CAUTION: BE VERY CAREFUL WHEN YOU DO WORK ON OR NEAR THE AIR-CONDITIONING DUCTS. THE DUCTS ARE MADE OF THIN MATERIAL AND YOU CAN EASILY BREAK THEM.

CAUTION: DO NOT PUT YOUR WEIGHT ON THE DUCTS. IT IS VERY EASY TO BREAK THEM.

FIN: 14HK

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT)
No specific	Torque wrench: range to between 0.5 and 0.4 m.daN (44.25 and 35.40 lbf.in )
No specific	Torque wrench: range to between 0.546 and 0.491 m.daN (48.32 and 43.45 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08ABC1)	Aqueous Cleaner-Aircraft Exterior Pressure Spraying -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
825

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
25	O-RINGS	AIPC 21-63-03-05-090
25	SEAL	AIPC 21-63-83-01-170

E. Referenced Information

REFERENCE	DESIGNATION
TASK 12-33-21-618-001-A-01	Pre-conditioning through the HP Ground Connection
TASK 12-33-21-618-001-A-02	Pre-conditioning with the APU
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
TASK 21-63-00-720-001-A	Functional Test of the Cockpit and Cabin Temperature Control without CFDS/MCDU.
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 25-54-12-000-001-A	Removal of the Forward Cargo-Compartment Partition
TASK 25-54-12-400-001-A	Installation of the Forward Cargo-Compartment Partition
TASK 52-30-00-860-001-A	Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 52-30-00-860-002-A	Close the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump
TASK 06-41-53-00	FUSELAGE-DESCRIPTION AND OPERATION
Pressure Regulating Valve ** ON A/C NOT FOR ALL
Pressure Regulating Valve ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 21-63-52-941-052-A

A. Safety Precautions
(1) On the panel 30VU:
(a) Make sure that:

the APU BLEED pushbutton switch is in the off position (the ON legend is off) and,
the ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are in the off position (the OFF legends are on).

(b) Put a warning notice in position to tell persons not to operate these pushbutton switches.
(2) On the HP and the LP ground connector put a warning notice in position to tell persons not to supply the ground air.

Subtask 21-63-52-860-050-A

B. Aircraft Maintenance Configuration
(1) Make sure that:
(a) The aircraft electrical circuits are energized (Ref. AMM TASK 25-54-12-000-001).
(b) The ACCESS PLATFORM 2M (6 FT) is in position at the forward cargo-compartment door 825.
(c) The forward cargo-compartment door 825 is open (Ref. AMM TASK 52-30-00-860-001).
(d) The access panels at partition FR34 (Ref. AMM D/O 06-41-53-00) are removed (Ref. AMM TASK 25-54-12-000-001).

Subtask 21-63-52-865-051-A

C. 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 COND/TEMP CTL/SYS 1 CHAN B/28VDC	52HH	D08
** ON A/C NOT FOR ALL
122VU	AIR COND/ZONE TEMP CTL/28VDC/SYS2	4HK	V20
122VU	AIR COND/ZONE TEMP CTL/28VDC/SYS1	3HK	V19
122VU	AIR COND/ZONE TEMP CTL/115VAC/SYS2	2HK	V18
122VU	AIR COND/ZONE TEMP CTL/115VAC/SYS1	1HK	V17
** ON A/C NOT FOR ALL
122VU	AIR COND/TEMP CTL SYS 2/CHAN A/115VAC	53HH	W22
122VU	AIR COND/TEMP CTL SYS 2/CHAN A/28VDC	55HH	W21
122VU	AIR COND/TEMP CTL SYS 1/CHAN A/115VAC	49HH	X22
122VU	AIR COND/TEMP CTL SYS 1/CHAN A/28VDC	51HH	X21
122VU	AIR COND/TEMP CTL SYS 2/CHAN B/28VDC	56HH	Y21
122VU	AIR COND/TEMP CTL SYS 2/CHAN B/115VAC	54HH	Y20
122VU	AIR COND/TEMP CTL SYS 1/CHAN B/115VAC	50HH	Y18

4. Procedure
Subtask 21-63-52-420-053-B ** ON A/C NOT FOR ALL

A. Installation of the Pressure Regulating Valve

Pressure Regulating Valve ** ON A/C NOT FOR ALL

(1) Remove the blanking plugs from the duct flanges (24) and (29), the duct assembly (27), and the pressure regulating valve (30).
(2) Clean the component interfaces and the adjacent area.
(3) Make sure that the parts retained from the removed component are clean and in the correct condition.
(4) Put a new AIPC 21-63-03-05-090 O-RINGS (25) and the pressure regulating valve (30) in position on the duct flange (24).
(5) Install the clamp (31).
(6) Do not fully tighten the bolt of the clamp (31) at this time.
Make sure that:

the pressure regulating valve (30) faces in the correct direction.
when you look in a rearwards direction the manual closure lever is in the 3 o'clock position.

(7) Put a new PACKING (25) in position on the pressure regulating valve (30).
(8) Put the duct assembly (27) in position on the duct flange (29) and the pressure regulating valve (30).
(9) Install the clamps (26) and (28).
(10) Do not fully tighten the bolts of the clamps (26) and (28) at this time.
(11) Clean the control tubes (4) and (5):
(a) Remove the blanking plugs from the disconnected line ends.
(b) Clean the control tubes with Aqueous Cleaner-Aircraft Exterior Pressure Spraying - (Material No.08ABC1) .
(c) From the pressure regulating valve (30) position, blow clean, dry compressed air into the control tubes to remove any dust-like contamination or humidity.
(12) Make sure that the pressure regulating valve (30) is in the correct position and install the control tubes (4) and (5).
(13) Install the control tubes (4) to the check valves [7270HM] and [7272HM]
(14) TORQUE the bolts of the clamps (31) and (26) to between 0.546 and 0.491 m.daN (48.32 and 43.45 lbf.in )

.
(15) TORQUE the bolt of the clamp (28) to between 0.5 and 0.4 m.daN (44.25 and 35.40 lbf.in )

.
(16) Put the bonding strap (8) in position and install the washer (7), the screw (6), the washer (9) and the nut (10) (Ref. AMM TASK 20-28-00-912-802).
(17) Remove the blanking caps from the disconnected electrical connections.
(18) Make sure that all the electrical connections are clean and in the correct condition.

CAUTION: TO PREVENT POSSIBLE CROSS-CONNECTION OF THE ELECTRICAL CONNECTORS, MAKE SURE THAT PLUGS AND RECEPTACLES ARE CLEARLY IDENTIFIED.

(19) Connect the electrical connectors (1), (2) and (3). receptacles.
(20) Make sure that the work area is clean and clear of tools and other items.

Subtask 21-63-52-420-053-C ** ON A/C NOT FOR ALL

A. Installation of the Pressure Regulating Valve

Pressure Regulating Valve ** ON A/C NOT FOR ALL

(1) Remove the blanking plugs from the duct flanges (24) and (29), the duct assembly (27), and the pressure regulating valve (30).
(2) Clean the component interfaces and the adjacent area.
(3) Make sure that the parts retained from the removed component are clean and in the correct condition.
(4) Put a new AIPC 21-63-03-05-090 O-RINGS (25) or AIPC 21-63-83-01-170 SEAL (25) and the pressure regulating valve (30) in position on the duct flange (24).
(5) Install the clamp (31).
(6) Do not fully tighten the bolt of the clamp (31) at this time.
Make sure that:

the pressure regulating valve (30) faces in the correct direction.
when you look in a rearwards direction the manual closure lever is in the 3 o'clock position.

NOTE: For pressure regulating valve (30) P/N 70853A01xxxx only, make sure that:

the clamp (31) bolt is horizontal in the 6 o' clock position.

(7) Put a new packing (25) in position on the pressure regulating valve (30).
(8) Put the duct assembly (27) in position on the duct flange (29) and the pressure regulating valve (30).
(9) Install the clamps (26) and (28).
(10) Do not fully tighten the bolts of the clamps (26) and (28) at this time.

NOTE: For pressure regulating valve (30) P/N 70853A01xxxx only, make sure that:

the clamp (26) bolt is horizontal in the 6 o' clock position.

(11) Clean the control tubes (4) and (3):
(a) Remove the blanking plugs from the disconnected line ends.
(b) Clean the control tubes with Aqueous Cleaner-Aircraft Exterior Pressure Spraying - (Material No.08ABC1) .
(c) From the pressure regulating valve (30) position, blow clean, dry compressed air into the control tubes to remove any dust-like contamination or humidity.
(12) Make sure that the pressure regulating valve (30) is in the correct position and install the control tubes (4) and (3).
(13) Install the control tube (4) to the check valves [7270HM] and [7272HM]
(14) TORQUE the bolts of the clamps (31) and (26) to between 0.546 and 0.491 m.daN (48.32 and 43.45 lbf.in )

.
(15) TORQUE the bolt of the clamp (28) to between 0.5 and 0.4 m.daN (44.25 and 35.40 lbf.in )

.
(16) Put the bonding strap (7) in position and install the washer (6), the screw (5), the washer (8) and the nut (9) (Ref. AMM TASK 20-28-00-912-802).
(17) Remove the blanking caps from the disconnected electrical connections.
(18) Make sure that all the electrical connections are clean and in the correct condition.

CAUTION: TO PREVENT POSSIBLE CROSS-CONNECTION OF THE ELECTRICAL CONNECTORS, MAKE SURE THAT PLUGS AND RECEPTACLES ARE CLEARLY IDENTIFIED.

(19) Connect the electrical connectors (1) and (2). receptacles.

NOTE: For pressure regulating valve (30) P/N 746A0000-XX make sure that: the third receptacle must be left blank with its blanking cap on it.

(20) Make sure that the work area is clean and clear of tools and other items.

Subtask 21-63-52-865-053-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 NOT FOR ALL
49VU	AIR COND/TEMP CTL/SYS 1 CHAN B/28VDC	52HH	D08
** ON A/C NOT FOR ALL
122VU	AIR COND/ZONE TEMP CTL/28VDC/SYS2	4HK	V20
122VU	AIR COND/ZONE TEMP CTL/28VDC/SYS1	3HK	V19
122VU	AIR COND/ZONE TEMP CTL/115VAC/SYS2	2HK	V18
122VU	AIR COND/ZONE TEMP CTL/115VAC/SYS1	1HK	V17
** ON A/C NOT FOR ALL
122VU	AIR COND/TEMP CTL SYS 2/CHAN A/115VAC	53HH	W22
122VU	AIR COND/TEMP CTL SYS 2/CHAN A/28VDC	55HH	W21
122VU	AIR COND/TEMP CTL SYS 1/CHAN A/115VAC	49HH	X22
122VU	AIR COND/TEMP CTL SYS 1/CHAN A/28VDC	51HH	X21
122VU	AIR COND/TEMP CTL SYS 2/CHAN B/28VDC	56HH	Y21
122VU	AIR COND/TEMP CTL SYS 2/CHAN B/115VAC	54HH	Y20
122VU	AIR COND/TEMP CTL SYS 1/CHAN B/115VAC	50HH	Y18

Subtask 21-63-52-710-050-A

C. Test
(1) Do the pre-conditioning through the HP ground connector or with the APU (Ref. AMM TASK 12-33-21-618-001) (Ref. AMM TASK 12-33-21-618-001).
(2) Do a leak check of the pressure regulating valve (30) connections.
(3) Make sure that there are no leaks.
(4) After approximately 15 minutes stop the pre-conditioning (Ref. AMM TASK 12-33-21-618-001) (Ref. AMM TASK 12-33-21-618-001).
(5) Do the functional test of the cockpit and cabin temperature control system (Ref. AMM TASK 21-63-00-720-001).

5. Close-up
Subtask 21-63-52-410-050-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 at partition FR34 (Ref. AMM D/O 06-41-53-00) (Ref. AMM TASK 25-54-12-400-001).
(3) Close the forward cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-002).
(4) Remove the access platform(s).

Subtask 21-63-52-862-050-A

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

[Rev.10 from 2021] 2026.04.01 04:09:50 UTC