Installation of the Turbine Bypass Valve

TASK 21-61-53-400-001-A
Installation of the Turbine Bypass 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.

FIN: 10HH
FIN: 30HH

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

REFERENCE	QTY	DESIGNATION
No specific	Torque wrench: range to between 0.25 and 0.2 m.daN (22.12 and 17.70 lbf.in )
No specific	Torque wrench: range to between 0.56 and 0.51 m.daN (49.56 and 45.13 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03QBD1)	Dry lubricant-General Assembly Graphite -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
191KB, 192KB

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
2	PACKING	AIPC 21-52-41-27-020
12	SEAL	AIPC 21-52-41-27-035
14	SEAL	AIPC 21-52-41-27-035
10	PACKING	AIPC 21-52-41-27-055

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 21-61-00-710-001-A	Operational Test of the Pack Temperature-Control System
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
Bypass Valve ** ON A/C NOT FOR ALL
Bypass Valve ** ON A/C NOT FOR ALL
Bypass Valve ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 21-61-53-860-050-A

A. Aircraft Maintenance Configuration
(1) Make sure that:
(a) The aircraft electrical circuits are energized (Ref. AMM TASK 24-41-00-861-002),
(b) The access panel is removed (Ref. AMM TASK 53-35-13-000-002).
(c) FOR [10HH] (VALVE-TURBINE BYPASS)
191KB.
(d) FOR [30HH] (VALVE-TURBINE BYPASS)
192KB.

Subtask 21-61-53-865-051-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 10HH (VALVETURBINE BYPASS)
49VU	AIR COND/TEMP CTL/SYS 1 CHAN B/28VDC	52HH	D08
** ON A/C NOT FOR ALL
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
** ON A/C NOT FOR ALL
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
** ON A/C NOT FOR ALL
FOR FIN: 30HH (VALVETURBINE BYPASS)
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
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 21-61-53-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Bypass Valve
(1) Make sure that the parts retained from the removed component are clean and in the correct condition.
(2) Make sure that the removed seal and packings are in a good condition. If necessary replace the AIPC 21-52-41-27-020 PACKING (2), the AIPC 21-52-41-27-055 PACKING (10) and/or the AIPC 21-52-41-27-035 SEAL (14).
(3) Apply lubricant:

CAUTION: USE ONLY THE SPECIFIED LUBRICANT TO LUBRICATE THE O-RINGS AND THE PACKINGS. OTHER LUBRICANTS CAN CAUSE SMOKE OR A SMELL IN THE CABIN WHEN THEY BECOME HOT.

(a) Apply a small quantity of Dry lubricant-General Assembly Graphite - (Material No.03QBD1) to the seal (14), the packings (2) and the packing (10).
(4) Remove the blanking plugs from the disconnected line ends.
(5) Clean the component interfaces and the adjacent area.
(6) Put the seal (14) in position on the bypass valve (5).
(7) Put the bypass valve (5) in position in the pipe assembly (8).
(8) Put the packings (2) in position on the air cycle machine flange (6) and the air cycle machine (1).
(9) Put the packing (10 ) in position on the anti-ice valve (3).
(10) Put the bypass valve (5) together with the pipe assembly (8) in position.
(11) Install the clamps (7), (9) and (16) in position but do not tighten them at this time.
(12) Position the bypass valve (5) and the clamp (7).
(a) Actuator Body Radial Position
1 On bypass valve P/N 758A0000-02 and previous:

make sure that when you look in a forward direction the bypass valve actuator body is in the 9 o'clock position (horizontal).

2 On bypass valve P/N 1312A0000-01 and subsequent:

make sure that when you look in a forward direction the bypass valve actuator body is between the 10 o'clock and 11 o'clock position.
This will make sure that the electrical connector (4) can be correctly installed.

(b) At the Clamp (7):

make sure that when you look in a rearward direction, the nut of the clamp (7) is in the 10 o'clock position.
This will make sure that the clamp (7) will not come in contact with the access panel 191KB (192KB).

(13) TORQUE the clamps (7), (9) and (16) to between 0.56 and 0.51 m.daN (49.56 and 45.13 lbf.in )

.
(14) Put the bonding strap (13) in position and install the screw (15), the washer (11) and the nut (12).
(15) TORQUE the nut (12) to between 0.25 and 0.2 m.daN (22.12 and 17.70 lbf.in )

(Ref. AMM TASK 20-28-00-912-802).
(16) Remove the blanking caps and connect the electrical connector (4).
(17) Make sure that the work area is clean and clear of tools and other items.

Subtask 21-61-53-420-050-B ** ON A/C NOT FOR ALL

A. Installation of the Bypass Valve
(1) Make sure that the parts retained from the removed component are clean and in the correct condition.
(2) Make sure that the removed seal and the packings are in a good condition. If necessary, replace the AIPC 21-52-41-27-020 PACKING (2) and the AIPC 21-52-41-27-035 SEAL (12).
(3) Apply lubricant:

CAUTION: USE ONLY THE SPECIFIED LUBRICANT TO LUBRICATE THE O-RINGS AND THE PACKINGS. OTHER LUBRICANTS CAN CAUSE SMOKE OR A SMELL IN THE CABIN WHEN THEY BECOME HOT.

(a) Apply a small quantity of Dry lubricant-General Assembly Graphite - (Material No.03QBD1) to the seal (12) and the packings (2).
(4) Remove the blanking plugs from the disconnected line ends.
(5) Clean the component interfaces and the adjacent area.
(6) Put the seal (12) in position on the bypass valve (4).
(7) Put the bypass valve (4) in position in the pipe assembly (7).
(8) Put the packings (2) in position on the air cycle machine flange (5) and the air cycle machine (1).
(9) Put the bypass valve (4) together with the pipe assembly (7) in position.
(10) Put the clamps (6) and (8) in position but do not tighten them at this time.
(11) Put the bypass valve (4) and the clamp (6) in position:
(a) Actuator body radial position:
1 At the bypass valve:

Make sure that when you look in the forward direction, the bypass valve actuator body is between the 10 o'clock and 11 o'clock position.
This will make sure that the electrical connector (3) can be correctly installed.

2 At the clamp (6):

Make sure that when you look in the rear view, the nut of the clamp (6) is in the 10 o'clock position.
This will make sure that the clamp (6) does not touch the access panel 191KB ( 192KB).

(12) TORQUE the clamps (6) and (8) to between 0.56 and 0.51 m.daN (49.56 and 45.13 lbf.in )

.
(13) Put the bonding strap (11) in position and install the screw (13), the washer (10) and the nut (9).
(14) TORQUE the nut (9) to between 0.25 and 0.2 m.daN (22.12 and 17.70 lbf.in )

(Ref. AMM TASK 20-28-00-912-802).
(15) Remove the blanking caps and connect the electrical connector (3).
(16) Make sure that the work area is clean and clear of tools and other items.

Subtask 21-61-53-865-054-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
FOR FIN: 10HH (VALVETURBINE BYPASS)
49VU	AIR COND/TEMP CTL/SYS 1 CHAN B/28VDC	52HH	D08
** ON A/C NOT FOR ALL
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
** ON A/C NOT FOR ALL
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
** ON A/C NOT FOR ALL
FOR FIN: 30HH (VALVETURBINE BYPASS)
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
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 21-61-53-710-050-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 bypass valve connections.

NOTE: Leaks are not permitted.

(3) After approx. 15 minutes stop the pre-conditioning (Ref. AMM TASK 12-33-21-618-001) (Ref. AMM TASK 12-33-21-618-001).
(4) Do the operational test of the pack temperature-control system (Ref. AMM TASK 21-61-00-710-001).

5. Close-up
Subtask 21-61-53-410-052-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panel (Ref. AMM TASK 53-35-13-400-002).
(a) FOR [10HH] (VALVE-TURBINE BYPASS)
191KB.
(b) FOR [30HH] (VALVE-TURBINE BYPASS)
192KB.

Subtask 21-61-53-862-050-A

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

[Rev.10 from 2021] 2026.04.02 06:11:41 UTC