Installation of the Pack Flow-Control Valve/Pack Flow-Control Unit

TASK 21-51-51-400-001-A
Installation of the Pack Flow-Control Valve/Pack Flow-Control Unit

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

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.

FIN: 11HB ** ON A/C NOT FOR ALL
FIN: 23HB ** ON A/C NOT FOR ALL
FIN: 24HB ** ON A/C NOT FOR ALL
FIN: 8HB ** 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	1	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.50 and 0.40 m.daN (44.25 and 35.40 lbf.in )
No specific	Torque wrench: range to between 1.06 and 0.82 m.daN (93.81 and 72.57 lbf.in )
No specific	Torque wrench: range to between 1.05 and 0.95 m.daN (92.92 and 84.07 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03PBB1)	Lubricant-Anti Seize High Temp. -
(Material No.06LCG9)	Non Hardening Jointing Putty-Medium Temp. Area - -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [11HB] (P1 FLOW CTL VALVE)
191BB, 191KB
FOR [23HB] (FLOW CTL UNIT-PACK 1)
191BB, 191KB
FOR [24HB] (FLOW CTL UNIT-PACK 2)
192FB, 192KB
FOR [8HB] (P2 FLOW CTL VALVE)
192FB, 192KB

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
31	SEAL 64 INSTL	AIPC 21-52-03-11-420
131	SEALS	AIPC 21-52-03-17-340
31	SEAL	AIPC 21-52-83-03-320
131	SEAL	AIPC 21-52-83-10-270

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 20-26-00-910-002-A	Installation of Expansion Joints
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
TASK 20-28-00-912-803-A	Bonding Surface Preparation
TASK 21-51-00-710-002-A	Operational Test of the Flow Control and Indicating System
TASK 21-51-41-000-001-A	Removal of the Ozone Filter
TASK 21-51-41-400-001-A	Installation of the Ozone Filter
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 53-35-13-000-002-A	Removal of the Quick-Release Access Panels from the Belly Fairing Structure
TASK 53-35-13-400-002-A	Installation of the Quick-Release Access Panels on the Belly Fairing Structure
Pack Flow-Control Valve ** ON A/C NOT FOR ALL
Pack Flow-Control Unit ** ON A/C NOT FOR ALL
Pack Flow-Control Valve ** ON A/C NOT FOR ALL
Attachment Components - Pack Flow-Control Valve

3. Job Set-up
Subtask 21-51-51-860-050-B ** 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).
(2) Make sure that the WARNING NOTICE(S) is (are) in position in the cockpit to tell persons not to start the APU.
(3) In the cockpit, on AIR COND panel 30VU, make sure that:

The APU BLEED pushbutton switch is released (the OFF legend is on).
The ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are released (the OFF legends are on).

(a) The WARNING NOTICE(S) is (are) in position to tell persons not to operate these pushbutton switches.
(4) On the HP ground connector, make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to supply the ground air.
(5) Make sure that the access panels are removed (Ref. AMM TASK 53-35-13-000-002):
(a) FOR [11HB] (P1 FLOW CTL VALVE)

191KB
191BB.

(b) FOR [8HB] (P2 FLOW CTL VALVE)

192KB
192FB.

(6) Make sure that the ozone filter is removed (Ref. AMM TASK 21-51-41-000-001).

Subtask 21-51-51-860-050-D ** ON A/C NOT FOR ALL

The APU BLEED pushbutton switch is released (the OFF legend is on).
The ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are released (the OFF legends are on).

191KB
191BB.

(b) FOR [24HB] (FLOW CTL UNIT-PACK 2)

192KB
192FB.

(6) Make sure that the ozone filter is removed (Ref. AMM TASK 21-51-41-000-001).

Subtask 21-51-51-865-072-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41
121VU	APU/FIRE/EXTIG/SQUIB/B	2WF	L39
121VU	APU/FIRE/EXTIG/SQUIB/A	1WF	L38
** ON A/C NOT FOR ALL
FOR FIN: 11HB (P1 FLOW CTL VALVE)
49VU	AIR COND/FLOW/CTL &/IND1	1HB	D07
122VU	AIR COND/PACK TEMP/CTL SYS1/1/115VAC	1HH	X22
122VU	AIR COND/PACK TEMP/CTL SYS1/1/28VDC	3HH	X21
122VU	AIR COND/PACK TEMP CTL SYS2/1/28VDC	4HH	Y19
122VU	AIR COND/PACK TEMP CTL SYS2/1/115VAC	2HH	Y18
FOR FIN: 8HB (P2 FLOW CTL VALVE)
122VU	AIR COND/FLOW/CTL AND IND/2	2HB	V21
122VU	AIR COND/PACK TEMP/CTL SYS1/2/115VAC	21HH	W22
122VU	AIR COND/PACK TEMP/CTL SYS1/2/28VDC	23HH	W21
122VU	AIR COND/PACK TEMP CTL SYS2/2/28VDC	24HH	Y21
122VU	AIR COND/PACK TEMP CTL SYS2/2/115VAC	22HH	Y20
** ON A/C NOT FOR ALL
FOR FIN: 23HB (FLOW CTL UNITPACK 1)
49VU	AIR COND/TEMP CTL/SYS 1 CHAN B/28VDC	52HH	D08
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 1/CHAN B/115VAC	50HH	Y18
FOR FIN: 24HB (FLOW CTL UNITPACK 2)
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 2/CHAN B/28VDC	56HH	Y21
122VU	AIR COND/TEMP CTL SYS 2/CHAN B/115VAC	54HH	Y20

4. Procedure
Subtask 21-51-51-420-054-A

A. Installation of the Attachment Components

Attachment Components - Pack Flow-Control Valve

(1) Apply a small quantity of Non Hardening Jointing Putty-Medium Temp. Area - - (Material No.06LCG9) to the fitting (12) and the bushing (6).
(2) Put the fitting (12) in position in the brackets (11).
(3) Install the bushing (6), washer (7) (if removed), bolt (5), washer (4) and nut (3).
(4) Tighten the nut (3).

Subtask 21-51-51-420-051-D ** ON A/C NOT FOR ALL

B. Installation of the Pack Flow-Control Valve
(1) To prevent damage to the related seals and the sliding surfaces of the components, turn the flanges or seals when you move or install them.
(2) Remove the protective covers from the pack flow-control valve (17) and the heat exchanger-unit connecting-end (15).
(3) Clean the component interfaces and the adjacent area.
(4) Make sure that the parts retained from the removed component are clean and in the correct condition.
(5) Prepare the surface of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-803).
(6) Make sure that the components that follow are clean and dry:
(a) The seal retaining grooves in the sleeve (14)
(b) The sliding surfaces of the flange (13) and the heat exchanger-unit connecting-end (15).
(7) Install the seals (Ref. AMM TASK 20-26-00-910-002):

NOTE: If the seal is not easy to install, you can make it wet with water.

(a) For pack flow-control valve 11HB:

Put the new AIPC 21-52-03-11-420 SEAL 64 INSTL (31) in position in the sleeve (14).

(b) For pack flow-control valve 8HB:

Put the new AIPC 21-52-03-11-420 INSTL (31) in position in the sleeve (14).

(8) Put the flange (13) in position in the sleeve (14).
(9) Put the sleeve (14) and the flange (13) together in position on the heat exchanger-unit connecting-end (15).
(10) Move the sleeve (14) and the flange (13) together away from the heat exchanger unit as far as possible.
(11) Carefully put the pack flow-control valve (17) in position on the fitting (12):
(a) Make sure that the arrow on the structure of the pack flow-control valve (17) points in the direction of the heat exchanger unit (15).
(12) Install the spacers (20), bolts (19), washers (26) (if applicable), washers (21) and nuts (22).
(13) TORQUE the nuts (22) to between 1.06 and 0.82 m.daN (93.81 and 72.57 lbf.in )

.
(14) Carefully move the flange (13) and the sleeve (14) in position on the pack flow-control valve (17).
(15) Put the clamp (16) in position on the flange (13) and the pack flow-control valve (17).
(16) Make sure that the clamp (16) does not touch the adjacent ducts.
(17) TORQUE the clamp (16) to between 0.50 and 0.40 m.daN (44.25 and 35.40 lbf.in )

.
(18) Put the bonding strap (25) in position and install the screw (18), the washer (24) and the nut (23).
(19) Do the electrical resistance measurement and the final protection of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-802).
(20) Remove the blanking caps from the sense line quick-connectors.
(21) Connect the sense lines (2) and (4).
(22) Install the threaded sense line as follows:
(a) Apply a small amount of Lubricant-Anti Seize High Temp. - (Material No.03PBB1) to the threads of the sense line connector (5).
(b) Install the sense line connector (5).
(c) TORQUE the sense line connector (5) to between 1.05 and 0.95 m.daN (92.92 and 84.07 lbf.in )

.
(23) Remove the CAP-BLANKING from each electrical connector and receptacle.

CAUTION: MAKE SURE THAT THE BONDING STRAP(S) IS(ARE) CONNECTED BEFORE YOU CONNECT THE ELECTRICAL CONNECTOR(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.

(24) Connect the electrical connector (3).

Subtask 21-51-51-420-051-I ** ON A/C NOT FOR ALL

B. Installation of the Pack Flow-Control Unit
(1) To prevent damage to the related seals and the sliding surfaces of the components, turn the flanges or seals when you move or install them.
(2) Remove the protective covers from the pack flow-control unit (17) and the heat exchanger-unit connecting-end (15).
(3) Clean the component interfaces and the adjacent area.
(4) Make sure that the parts retained from the removed component are clean and in the correct condition.
(5) Prepare the surface of the bonding point(s)
(Ref. AMM TASK 20-28-00-912-803).
(6) Make sure that the components that follow are clean and dry:
(a) The seal retaining grooves in the sleeve (14)
(b) The sliding surfaces of the flange (13) and the heat exchanger-unit connecting-end (15).
(7) Install the seals (Ref. AMM TASK 20-26-00-910-002):

NOTE: If the seal is not easy to install, you can make it wet with water.

(a) For pack flow-control unit 23HB:

Put the new AIPC 21-52-03-11-420 SEAL 64 INSTL (31) or AIPC 21-52-83-03-320 SEAL (31) in position in the sleeve (14).

(b) For pack flow-control unit 24HB:

Put the new AIPC 21-52-03-17-340 SEALS (131) or AIPC 21-52-83-10-270 SEAL (131) in position in the sleeve (14).

(8) Put the flange (13) in position in the sleeve (14).
(9) Put the sleeve (14) and the flange (13) together in position on the heat exchanger-unit connecting-end (15).
(10) Move the sleeve (14) and the flange (13) together away from the heat exchanger unit as far as possible.
(11) Carefully put the pack flow-control unit (17) in position on the fitting (12):
(a) Make sure that the arrow on the structure of the pack flow-control valve (17) points in the direction of the heat exchanger unit (15).
(12) Install the spacers (20), bolts (19), washers (26) (if applicable), washers (21) and nuts (22).
(13) TORQUE the nuts (22) to between 1.06 and 0.82 m.daN (93.81 and 72.57 lbf.in )

.
(14) Carefully move the flange (13) and the sleeve (14) in position on the pack flow-control unit (17).
(15) Put the clamp (16) in position on the flange (13) and the pack flow-control system (17).
(16) Make sure that the clamp (16) does not touch the adjacent ducts.
(17) TORQUE the clamp (16) to between 0.50 and 0.40 m.daN (44.25 and 35.40 lbf.in )

CAUTION: MAKE SURE THAT THE BONDING STRAP(S) IS(ARE) CONNECTED BEFORE YOU CONNECT THE ELECTRICAL CONNECTOR(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.

(21) Connect the electrical connectors (2), (3) and (4).

Subtask 21-51-51-410-058-B ** ON A/C NOT FOR ALL

C. Installation of the Ozone Filter upstream
(1) Install the ozone filter upstream of the flow control valve (Ref. AMM TASK 21-51-41-400-001).

Subtask 21-51-51-220-050-B ** ON A/C NOT FOR ALL

D. Post Installation Measurement and Adjustment
(1) Locations.
(a) At the sleeve (14):
1 Move the sleeve (14) until the Z dimensions are approximately equal.

NOTE: Turn the sleeve when you move it.
This will help to prevent damage to the seals in the sleeve.

2 Do a check of the Y dimension:

measure the maximum and minimum Y dimensions around the circumference of the sleeve (14),
the difference between the maximum and minimum Y dimensions must not be more than 1.7 mm (0.0669 in.).

(b) At the fitting (12):
1 do a check of the dimension V between the fitting (12) and the brackets (11).

this dimension must not be less than 1.2 mm (0.0472 in.).
You can get these tolerances if you adjust:

a on the heat exchanger unit the tie-rod (1) and,
b on the ozone filter the tie rod (1) (Ref. AMM TASK 21-51-41-400-001).

You must only adjust the tie-rods (1).
Safety the tie-rods (1) after you adjust them.

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

Subtask 21-51-51-410-058-D ** ON A/C NOT FOR ALL

E. Installation of the Ozone Filter upstream of the Flow Control Unit
(1) Install the ozone filter (Ref. AMM TASK 21-51-41-400-001).

Subtask 21-51-51-220-050-D ** ON A/C NOT FOR ALL

F. Post Installation Measurement and Adjustment
(1) Locations.
(a) At the sleeve (14):
1 Move the sleeve (14) until the Z dimensions are approximately equal.

NOTE: Turn the sleeve when you move it.
This will help to prevent damage to the seals in the sleeve.

2 Do a check of the Y dimension:

measure the maximum and minimum Y dimensions around the circumference of the sleeve (14),
the difference between the maximum and minimum Y dimensions must not be more than 1.7 mm (0.0669 in.).

(b) At the fitting (12):
1 do a check of the dimension V between the fitting (12) and the brackets (11).

this dimension must not be less than 1.2 mm (0.0472 in.).
You can get these tolerances if you adjust:

a on the heat exchanger unit the tie-rod (1) and,

Pack Flow-Control Unit ** ON A/C NOT FOR ALL

Pack Flow-Control Valve ** ON A/C NOT FOR ALL

b on the ozone filter (Ref. AMM TASK 21-51-41-400-001) the tie rod (1).

You must only adjust the tie-rods (1).
Safety the tie-rods (1) after you adjust them.

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

Subtask 21-51-51-865-073-A

G. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41
121VU	APU/FIRE/EXTIG/SQUIB/B	2WF	L39
121VU	APU/FIRE/EXTIG/SQUIB/A	1WF	L38
** ON A/C NOT FOR ALL
FOR FIN: 11HB (P1 FLOW CTL VALVE)
49VU	AIR COND/FLOW/CTL &/IND1	1HB	D07
122VU	AIR COND/PACK TEMP/CTL SYS1/1/115VAC	1HH	X22
122VU	AIR COND/PACK TEMP/CTL SYS1/1/28VDC	3HH	X21
122VU	AIR COND/PACK TEMP CTL SYS2/1/28VDC	4HH	Y19
122VU	AIR COND/PACK TEMP CTL SYS2/1/115VAC	2HH	Y18
FOR FIN: 8HB (P2 FLOW CTL VALVE)
122VU	AIR COND/FLOW/CTL AND IND/2	2HB	V21
122VU	AIR COND/PACK TEMP/CTL SYS1/2/115VAC	21HH	W22
122VU	AIR COND/PACK TEMP/CTL SYS1/2/28VDC	23HH	W21
122VU	AIR COND/PACK TEMP CTL SYS2/2/28VDC	24HH	Y21
122VU	AIR COND/PACK TEMP CTL SYS2/2/115VAC	22HH	Y20
** ON A/C NOT FOR ALL
FOR FIN: 23HB (FLOW CTL UNITPACK 1)
49VU	AIR COND/TEMP CTL/SYS 1 CHAN B/28VDC	52HH	D08
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 1/CHAN B/115VAC	50HH	Y18
FOR FIN: 24HB (FLOW CTL UNITPACK 2)
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 2/CHAN B/28VDC	56HH	Y21
122VU	AIR COND/TEMP CTL SYS 2/CHAN B/115VAC	54HH	Y20

Subtask 21-51-51-710-050-A ** ON A/C NOT FOR ALL

H. Test
(1) Do the pre-conditioning through the HP ground connector (Ref. AMM TASK 12-33-21-618-001) or with the APU (Ref. AMM TASK 12-33-21-618-001).
(2) Do a leak check of the pack flow-control valve.

NOTE: Minimum leakage is permitted. After the pack operates some minutes, the leakage of air will reduce because the seals have their correct operating temperature.

(3) Do a leak check of the sense line connections.

NOTE: Leaks are not permitted.

(4) After approx. 15 minutes stop the pre-conditioning (Ref. AMM TASK 12-33-21-618-001) or (Ref. AMM TASK 12-33-21-618-001).
(5) Do the operational test of the flow control and indicating system (Ref. AMM TASK 21-51-00-710-002).

Subtask 21-51-51-710-050-B ** ON A/C NOT FOR ALL

H. Test
(1) Do the operational test of the flow control and indicating system (Ref. AMM TASK 21-51-00-710-002).

5. Close-up
Subtask 21-51-51-410-053-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) Install the access panels (Ref. AMM TASK 53-35-13-400-002):
(a) FOR [11HB] (P1 FLOW CTL VALVE)

191KB
191BB.

(b) FOR [8HB] (P2 FLOW CTL VALVE)

192KB
192FB.

(3) Remove the WARNING NOTICE(S).

Subtask 21-51-51-410-053-B ** 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) Install the access panels (Ref. AMM TASK 53-35-13-400-002):
(a) FOR [23HB] (FLOW CTL UNIT-PACK 1)

191KB
191BB.

(b) FOR [24HB] (FLOW CTL UNIT-PACK 2)

192KB
192FB.

(3) Remove the WARNING NOTICE(S).

Subtask 21-51-51-862-050-A

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

[Rev.10 from 2021] 2026.04.02 06:11:23 UTC