Installation of the AFT Air-Intake Anti-Ice Valve (PRSOV1)

TASK 30-21-51-400-804-A
Installation of the AFT Air-Intake Anti-Ice Valve (PRSOV1)

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.

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

FIN: 4010DN

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	CAP - PROTECTION
No specific	AR	COVER - PROTECTION
No specific	1	MALLET - PLASTIC
No specific	1	PLIERS - JAWED, SOFT
No specific	AR	WARNING NOTICE(S)
No specific	1	WRENCH - STANDARD
No specific	Torque wrench: range to between 0.43 and 0.36 m.daN (38.05 and 31.86 lbf.in )
No specific	Torque wrench: range to between 1.40 and 1.20 m.daN (123.89 and 106.19 lbf.in )
No specific	Torque wrench: range to between 1.43 and 1.23 m.daN (126.55 and 108.85 lbf.in )
No specific	Torque wrench: range to between 1.41 and 1.30 m.daN (124.78 and 115.04 lbf.in )
No specific	Torque wrench: range to between 1.77 and 1.51 m.daN (13.05 and 11.14 lbf.ft )
No specific	Torque wrench: range to between 3.48 and 2.96 m.daN (25.66 and 21.83 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CPNCL00182)	GRAPHITED PETROLATUM THREAD COMPOUND

C. 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

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
38	E-SEAL	AIPC 30-21-51-02-060
31	E-SEAL	AIPC 30-21-51-02-070

E. Referenced Information

REFERENCE	DESIGNATION
TASK 20-23-22-910-001-A	Marking of the Unions after Application of Standard or Specific Tightening Torque
TASK 70-24-00-910-814-A	Standard Torque Recommendations
TASK 70-70-00-910-804-A	Electrical Standard Practices
TASK 71-00-00-790-810-A	Pneumatic Leak Test of the Engine EBU Air Ducts
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 73-29-00-740-803-A	Idle Test (Menu Mode)
TASK 78-30-00-040-809-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-809-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A	Closing of the Thrust Reverser Cowl Doors
Air-Intake Anti-Ice Valves

3. Job Set-up
Subtask 30-21-51-941-065-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) Make sure that the WARNING NOTICE(S) is 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) Make sure that the WARNING NOTICE(S) is in position to tell persons not to energize FADEC 1(2).

Subtask 30-21-51-865-084-A

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

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 30-21-51-010-081-A

C. Get Access
(1) Make sure that the fan cowl doors are open (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 30-21-51-040-057-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) Make sure that you did the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 30-21-51-010-082-A

E. Get Access
(1) Make sure that the left thrust reverser cowl-door is open (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL
(2) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.

4. Procedure
Subtask 30-21-51-420-059-A

CAUTION: DO NOT LOOSEN OR REMOVE THE BOLTS ATTACHED TO THE FORWARD INNER DUCT (36) AND THE ENGINE CASE WHEN YOU REMOVE/INSTALL PRSOV1. IF YOU DO NOT TIGHTEN/TORQUE THE BOLTS, THIS CAN CAUSE LEAKAGE OF HOT AIR FROM THE FORWARD INNER DUCT DURING THE ENGINE OPERATION.

A. Installation of the Aft Air-Intake Anti-Ice Valve (aft anti-ice valve) (1)

NOTE: This valve is also known as Pressure Regulating and Shut-Off Valve 1 (PRSOV1).

(1) Remove all COVER - PROTECTION and CAP - PROTECTION from the openings, tubes, hoses and the connectors.
(2) When you do the triple torque method, apply as per (Ref. AMM TASK 70-24-00-910-814).
(3) Make a mark on the connections after you apply the standard or specific tightening torque (Ref. AMM TASK 20-23-22-910-001).
(4) Lubricate the threads of the bolts that follow with GRAPHITED PETROLATUM THREAD COMPOUND (Material No.CPNCL00182) :
(a) Bolts (23), if removed
(b) Bolt (18)
(c) Bolt (34)
(d) Bolt (29), if removed
(e) Bolt (24), if removed.
(5) On a bench, attach tube hose (11) to aft anti-ice valve (1) as follows:
(a) Manually connect the tube hose (11) to the fitting on the aft anti-ice valve (1).
(b) Use a WRENCH - STANDARD to hold the fitting on the aft anti-ice valve (1).
(c) Use a second WRENCH - STANDARD to torque tube hose (11) to the aft anti-ice valve (1) fitting.
(d) TORQUE the tube nut on the tube hose (11) to between 3.48 and 2.96 m.daN (25.66 and 21.83 lbf.ft )

.
(6) On a bench, attach vent hose (9) to aft anti-ice valve (1) as follows:

CAUTION: DO NOT APPLY SIDE FORCE ON THE VENTILATION PORT OF THE AFT ANTI-ICE VALVE. IF YOU DO NOT OBEY THIS INSTRUCTION, YOU CAN CAUSE DAMAGE TO THE HEAT SHIELD OF THE ANTI-ICE VALVE.

(a) Carefully connect vent hose (9) to aft anti-ice valve (1) ventilation port.
(b) Make sure that the tube points on the correct direction:

The flow arrow of the tube (9) must point from the cooling tube (22) to the aft anti-ice valve (1).

(c) Install the coupling (20) around the vent hose (9) and the aft anti-ice valve (1) ventilation port.
(d) Being careful not to exert a side-force upon the ventilation port.
(e) TORQUE the coupling (20) to between 0.43 and 0.36 m.daN (38.05 and 31.86 lbf.in )

.
(f) Trim the tail of the coupling (20) to no longer than 12.7 mm (0.50 in.) beyond the torque screw housing.
(7) Install the aft anti-ice valve (1) assembly as follows:
(a) Make sure that the flanges of the aft anti-ice valve (1) and the mating flanges of the ducts (10) and (36) are clean and in serviceable condition.
(b) Install a new AIPC 30-21-51-02-060 E-SEAL (38) in the flange of the forward inner duct (36).
(c) Install a new AIPC 30-21-51-02-070 E-SEAL (31) in the aft end of the aft anti-ice valve (1).
(d) Carefully move the aft duct (10) in the aft direction to allow the aft anti-ice valve (1) space for installation.
(e) Carefully put the aft anti-ice valve (1) in position in the gap between the two ducts (10) and (36).

NOTE: The arrow on the valve must point in the direction of airflow. For the aft PRSOV, the arrow must point aft.

(f) Make sure that the key tab on the flange of the aft duct (10) engages with the mating slot in the aft flange of the aft anti-ice valve (1).
(g) Loosely assemble the V-band clamp (37) around the forward flange of the aft anti-ice valve (1) and the flange of the forward inner duct (36).
(h) Loosely assemble the V-band clamp (32) around the aft flange of the aft anti-ice valve (1) and the flange of the aft duct (10).
(i) If removed, loosely assemble the V-band clamp (28) around the aft flange of the forward anti-ice valve (17) and the aft duct (10) flange.
(j) Tighten the V-band clamps (32), (37), and (28) by hand.

NOTE: Do not torque the V-band clamps at this time.

(8) Connect the struts as follows:
(a) Move the strut (35) into position between the ears on the aft duct (10).
(b) Install the bolt (34) and nut (33) to attach the strut (35).
(c) Move the strut (19) into position between the ears on the aft duct (10).
(d) Install the bolt (18) and nut (14) to attach the strut (19).
(e) If disconnected, move the strut (27) and the strut (25) into position between the ears on the aft duct (10).
(f) If required, install the bolt (29) and nut (30) to attach the strut (27) and the bolt (24) and nut (26) to attach the strut (25).
(g) Hand-tighten nuts (33), (14), (30) and (26).

NOTE: Do not torque the nuts at this time.

(9) Torque the connections as follows:
(a) TORQUE the V-band clamps (32), (37), and (28) to between 1.41 and 1.30 m.daN (124.78 and 115.04 lbf.in )

.
(b) TORQUE the strut nuts (33), (14), (30) and (26) to between 1.40 and 1.20 m.daN (123.89 and 106.19 lbf.in )

.
(c) Lightly tap around the outer diameter of each V-band clamp with a MALLET - PLASTIC.

NOTE: Do not hit the latch mechanisms on the V-band clamps.

(d) TORQUE the V-band clamps (32), (37), and (28) to between 1.41 and 1.30 m.daN (124.78 and 115.04 lbf.in )

again.
(10) Install the muscle tube (21) as follows:

CAUTION: DO NOT TWIST THE MUSCLE TUBE WHEN YOU TIGHTEN IT. IF YOU APPLY A TORSIONAL LOAD, DAMAGE TO THE MUSCLE TUBE CAN OCCUR.

(a) Connect the muscle tube (21) to the mating port on the aft anti-ice valve (1).
(b) Connect the muscle tube (21) to the mating connector tube that extends from the forward anti-ice valve (17).
(c) Make a temporary mark on the forward and the aft coupling nuts on the muscle tube (21).
(d) Make temporary marks on the mating connectors that align with marks on the coupling nuts.
(e) Use these marks as you torque the coupling nuts to make sure the muscle tube does not become twisted.
(f) Use a counter-wrench to hold the fittings of the forward and aft valves as the nuts on the muscle line are torqued.

PRE SPOL BD-EBU-17019 and SB BD70CR30-017

(g) TRIPLE-TORQUE the aft connector on the muscle tube (21) to between 3.48 and 2.96 m.daN (25.66 and 21.83 lbf.ft )

.

END OF PRE SPOL BD-EBU-17019 and SB BD70CR30-017

POST SPOL BD-EBU-17019 and SB BD70CR30-017

(h) TRIPLE-TORQUE the aft connector on the muscle tube (21) to between 1.77 and 1.51 m.daN (13.05 and 11.14 lbf.ft )

.

END OF POST SPOL BD-EBU-17019 and SB BD70CR30-017

(i) TRIPLE-TORQUE the forward connector on the muscle tube (21) to between 1.77 and 1.51 m.daN (13.05 and 11.14 lbf.ft )

.
(11) Complete the installation of the aft anti-ice valve (1) as follows:
(a) Connect the tube hose (11) to the mating port on the aft duct (10).
1 Use a counter-wrench to hold the fitting on the aft duct (10) port fitting.
2 Use a second WRENCH - STANDARD to torque tube hose (11) to the aft duct (10) port fitting.
(b) TORQUE the coupling nut on the tube hose (11) to between 3.48 and 2.96 m.daN (25.66 and 21.83 lbf.ft )

.
(c) If removed, install the bolts (23) through aft duct (10) flange and spring clip bracket (16).
(d) TORQUE the bolts (23) to between 1.43 and 1.23 m.daN (126.55 and 108.85 lbf.in )

.
(e) Connect the vent hose (9) to the vent tube (22).
(f) Install the coupling (15) around the vent hose (9) and the vent tube (22).
(g) TORQUE the coupling (15) to between 0.43 and 0.36 m.daN (38.05 and 31.86 lbf.in )

.
(h) Trim the tail of the coupling (15) to no longer than 12.7 mm (0.50 in.) beyond the torque screw housing.
(i) Connect the electrical connector (2) to the aft anti-ice valve (1) (Ref. AMM TASK 70-70-00-910-804).
1 Use PLIERS - JAWED, SOFT to connect electrical connector (2) to the aft anti-ice valve (1).

POST SB LEAP-1A 72-0292

(j) Install the electrical harness (4) on the clamp (7) and tighten the bolt (6) with your hand.
(k) TORQUE the bolt (6) to between 0.43 and 0.36 m.daN (38.05 and 31.86 lbf.in )

.

END POST SB LEAP-1A 72-0292

(l) Push the electrical harness (3) and electrical harness (4) into the spring clips (5).
(m) Adjust the tension in the harnesses, as necessary.
(12) Install the sense tube (12) as follows:

CAUTION: MAKE SURE THAT THERE IS NO SPRING BACK FORCE BETWEEN THE SENSE TUBE AND THE PORT FITTING OF THE AFT DUCT. IF THERE IS, DAMAGE TO THE AFT DUCT CAN OCCUR.

(a) Manually connect sense tube (12) to air sense tube (13).
(b) TORQUE the aft coupling nut on the sense tube (12) to between 3.48 and 2.96 m.daN (25.66 and 21.83 lbf.ft )

.
(c) Verify that the forward coupling nut on the sense tube (12) correctly aligns with the aft duct (10) port fitting. Do not force the coupling nut onto the aft duct (10) port fitting.

NOTE: If the sense tube (12) does not properly align with the aft duct (10) port fitting, adjustments to the securing clamps for air sense tube (13) may be required.

(d) Manually connect the sense tube (12) to the aft duct (10) port fitting.
(e) TORQUE the forward coupling nut on the sense tube (12) to between 3.48 and 2.96 m.daN (25.66 and 21.83 lbf.ft )

Subtask 30-21-51-710-058-A

B. Operational Test
(1) Do the pneumatic leak test (Ref. AMM TASK 71-00-00-790-810).
(2) Do the Idle test (menu mode) (Ref. AMM TASK 73-29-00-740-803).

5. Close-up
Subtask 30-21-51-410-071-A

A. Close Access
(1) Remove the access platform(s).
(2) Close the left thrust reverser cowl-door (Ref. AMM TASK 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL

Subtask 30-21-51-440-054-A

B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-809).

Subtask 30-21-51-410-072-A

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Remove the WARNING NOTICE(S).

Subtask 30-21-51-865-085-A

D. Remove the safety clip(s) and the tag(s) and close 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

[Rev.10 from 2021] 2026.04.01 08:19:20 UTC