Removal of the Turbine Bypass Valve

TASK 21-61-53-000-001-A
Removal 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.

NOTE: The procedure is the same for the bypass valves 10HH and 30HH.

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	AR	CAP - BLANKING
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. 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 53-35-13-000-002-A	Removal of the Quick-Release Access Panels from 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 21-61-53-861-050-A

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

Subtask 21-61-53-865-050-A

B. Open, safety and tag 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 21-61-53-010-050-A

C. Get Access
(1) Remove the access panel (Ref. AMM TASK 53-35-13-000-002).
(a) FOR [10HH] (VALVE-TURBINE BYPASS)
191KB.
(b) FOR [30HH] (VALVE-TURBINE BYPASS)
192KB.

4. Procedure
Subtask 21-61-53-020-051-A ** ON A/C NOT FOR ALL

A. Removal of the Bypass Valve
(1) Disconnect the electrical connector (4).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Remove the nut (12), the washer (11), the screw (15) and disconnect the bonding strap (13).
(4) Remove the clamp (16).
(5) Hold the bypass valve (5) and remove the clamps (7) and (9).
(6) Remove the bypass valve (5) together with the pipe assembly (8).
(7) Remove the bypass valve (5) from the pipe assembly (8).
(8) Remove the packings (2), the seal (14) and the packing (10).
(9) Put the PLUG-BLANKING in each disconnected line end.

Subtask 21-61-53-020-051-B ** ON A/C NOT FOR ALL

A. Removal of the Bypass Valve
(1) Disconnect the electrical connector (3).
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Remove the nut (9), the washer (10), the screw (13) and disconnect the bonding strap (11).
(4) Hold the bypass valve (4) and remove the clamps (6) and (8).
(5) Remove the bypass valve (4) together with the pipe assembly (7).
(6) Remove the bypass valve (4) from the pipe assembly (7).
(7) Remove the packings (2) and the seal (12).
(8) Put the PLUG-BLANKING in each disconnected line end.

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