Removal of the FWD Air-Intake Anti-Ice Valve (PRSOV2)

TASK 30-21-51-000-805-A
Removal of the FWD Air-Intake Anti-Ice Valve (PRSOV2)

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.

FIN: 4011DN

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 1M(3 FT)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	TIE WRAP(S)
No specific	AR	WARNING NOTICE(S)
No specific	1	WRENCH - STANDARD

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR, 451AL
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 461AL

C. Referenced Information

REFERENCE	DESIGNATION
TASK 70-70-00-910-804-A	Electrical Standard Practices
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 72-24-01-000-801-A	Removal of Segment Shrouds 1 thru 5
TASK 75-21-10-000-803-A	Removal of the High Pressure Turbine (HPT) Active Clearance Control (ACC) Wye Duct
TASK 78-30-00-040-809-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
FWD Air-Intake Anti-Ice Valve (PRSOV2)

3. Job Set-up
Subtask 30-21-51-941-066-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch, and
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 30-21-51-865-091-A

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENGINE 1)
122VU	ANTI ICE/ENG/1	1DN1	X10
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENGINE 2)
122VU	ANTI ICE/ENG/2	1DN2	W10

Subtask 30-21-51-010-089-A

C. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR

Subtask 30-21-51-040-061-A

D. Deactivation of the Thrust Reverser System for Ground Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 30-21-51-010-090-A

E. Open the left thrust reverser cowl-door (Ref. AMM TASK 78-36-00-010-806):
(1) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL
(2) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL
(3) Put an ACCESS PLATFORM 1M(3 FT) in position.

4. Procedure
Subtask 30-21-51-020-061-A

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.

A. Removal of the Forward Air-Intake Anti-Ice Valve (forward anti-ice valve)

FWD Air-Intake Anti-Ice Valve (PRSOV2)

NOTE: This valve is also known as Pressure Regulating Shutoff valve 2 (PRSOV2).

NOTE: Put protection caps on all disconnected electrical connectors and all electrical receptacles.

NOTE: Put protection caps on all open ports, tubes and hoses.

(1) Disconnect the electrical connector (6) from the forward anti-ice valve (2) (Ref. AMM TASK 70-70-00-910-804).

POST SB LEAP-1A 72-0292

(2) Remove the bolt (7) from the clamp (8).
(3) Remove the electrical harness (4) from the clamp (8).

END POST SB LEAP-1A 72-0292

(4) Remove the electrical harness (3) and the electrical harness (4) from the spring clips (5).
(5) Disconnect the muscle tube (9) as follows:
(a) Use a counter WRENCH - STANDARD to hold the fitting on the forward anti-ice valve (2).
(b) Use a second WRENCH - STANDARD to disconnect the muscle tube (9) from the forward anti-ice valve (2) fitting.
(6) Remove the feedback tube (25) as follows:
(a) Use a counter WRENCH - STANDARD to hold the 90-degree fitting on the aft end of the feedback tube (25).
(b) Use a second WRENCH - STANDARD to disconnect the feedback tube (25) from the forward anti-ice valve (2) fitting.
(c) Use a counter WRENCH - STANDARD to hold the 90-degree fitting on the forward end of the feedback tube (25).
(d) Use a second WRENCH - STANDARD to disconnect the feedback tube (25) from the forward anti-ice duct (20), and remove the feedback tube (25) from the engine.
(7) Remove the two bolts (24) that attach the vent tube-hose (23) to the bracket (22) on the forward anti-ice valve (2).
(8) Move the vent tube-hose (23) out of the removal path of the forward anti-ice valve (2) and temporarily secure the vent tube-hose (23) with a TIE WRAP(S).
(9) Optional procedure: To get a better access to the strut (18), and the strut (11), remove the High Pressure Turbine (HPT) Active Clearance Control (ACC) Wye Duct (Ref. AMM TASK 75-21-10-000-803). You can also remove the "SEGMENT SHROUD 5" to obtain better access to the V-band clamp (14) on the forward end of the forward anti-ice valve (2) (Ref. AMM TASK 72-24-01-000-801).
(10) Remove the nut (19) and the bolt (21) that attach the strut (18) to the forward anti-ice duct (20).
(11) Move the strut (18) away from the ears on the forward anti-ice duct (20).
(12) Open and remove the V-band clamp (14) on the forward end of the forward anti-ice valve (2).

NOTE: If difficulties are found when the forward V-band clamp is removed, keep it open and remove it with the forward anti-ice valve (2).

(13) Open and remove the V-band clamp (13) on the aft end of the forward anti-ice valve (2).
(14) Move the forward anti-ice duct (20) in the forward direction as far as possible.
(15) Optional procedure: If you need more clearance to remove the forward anti-ice valve (2):
(a) Remove the nut (29) and the bolt (26) that attach the strut (11) to the aft anti-ice duct (10).
(b) Carefully move the strut (11) away from the ears on the aft anti-ice duct (10).
(c) Move the aft anti-ice duct (10) in the aft direction (as far as possible).
(16) Carefully lift the forward anti-ice valve (2) off of the engine.
(17) Remove and discard the E-seal (15) from the forward flange of the forward anti-ice valve (2).
(18) Remove and discard the E-seal (12) from the flange of the aft anti-ice duct (10).

[Rev.10 from 2021] 2026.04.01 08:19:15 UTC