Stage 10 Air Solenoid Valve - P3 Servo Line Purging Procedure

TASK 36-11-57-280-010-A
Stage 10 Air Solenoid Valve - P3 Servo Line Purging Procedure

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.

1. Reason for the Job
This task provides a purging procedure for the Cabin Air (HPC 10th stage bleed) Solenoid Valve P3 servo line.

NOTE: The illustrations attached to this procedure show the solenoid removed from the mounting bracket. This is for clarity purposes only. There is no need to remove the valve during this procedure.

NOTE: If a nitrogen supply is not available, clean dry air is permitted.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 1M(3 FT)
No specific	AR	FILLING EQUIPMENT - NITROGEN, PRESSURE REGULATED GAGE
No specific	1	GROUND AIR SUPPLY NITROGEN - 45 PSI (3.1 BAR)
No specific	1	NUT - AS15702, SOLENOID SUPPLY LINE CONNECTOR
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 221 and 204 lbf.in (2.50 and 2.31 m.daN )
IAE2R19437	1	TEST SET - BLEED VALVE

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.V02-126)	lockwire

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 70-23-11-911-013-A	General Torque Tightening Techniques
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
HPC Stage 10 Bleed Valve Solenoid

3. Job Set-up
Subtask 36-11-57-941-052-A ** ON A/C NOT FOR ALL

A. Safety Precautions

NOTE: This procedure requires a regulated GROUND AIR SUPPLY NITROGEN - 45 PSI (3.1 BAR) to be connected to the HPSOV NUT - AS15702, SOLENOID SUPPLY LINE CONNECTOR (Ref. AS 15702).
The IAE2R19437 TEST SET - BLEED VALVE contains an applicable connecting air hose but cannot supply sufficient flow to purge the HPSOV/PRV sense line. If the IAE2R19437 TEST SET - BLEED VALVE is not available, a custom-made air hose similar to the Test Set air hose can be used.

(1) Make sure that the engine 1(2) shut down occured not less than 5 minutes before you do this procedure.
(2) On the AIR COND panel 30VU:

Make sure that the ENG 1(2) BLEED pushbutton switch is released (the OFF legend is on),
Make sure that the APU BLEED pushbutton switch is released (the OFF legend is on),
Put a WARNING NOTICE(S) to tell persons not to operate the pneumatic system.

(3) On the ENG panel 115VU:

Put a WARNING NOTICE(S) to tell persons not to start the engine 1(2).

(4) On the HP ground connector:

Put a WARNING NOTICE(S) to tell persons not to pressurize the pneumatic system

(5) On the ENG section of the maintenance panel 50VU:

Make sure that the ON legend of the ENG/FADEC GND PWR 1(2) pushbutton switch is off,
Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 36-11-57-010-052-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowls (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.

4. Procedure
Subtask 36-11-57-020-052-A ** ON A/C NOT FOR ALL

A. Disconnect the HPSOV Supply Line at the Solenoid and Main P3 Supply Line

HPC Stage 10 Bleed Valve Solenoid ** ON A/C NOT FOR ALL

(1) Cut, discard the lockwire and disconnect the HPSOV P3 supply line (1) at the connector (2).
(2) Disconnect the HPSOV P3 supply line (1) from the P3 supply line (5) at the connector (6).

Subtask 36-11-57-160-051-A ** ON A/C NOT FOR ALL

B. Purge the P3 Servo Supply Line

HPC Stage 10 Bleed Valve Solenoid ** ON A/C NOT FOR ALL

NOTE: Do not bend the pneumatic pipes to gain access. If required, release the supporting P-clips until the pipe can be moved without undue force.

(1) Connect the FILLING EQUIPMENT - NITROGEN, PRESSURE REGULATED GAGE (3) to the HPSOV solenoid supply line connector (Ref. AS15702)
(2) TORQUE the remote nitrogen supply (3) and the HPSOV P3 supply connector (2) to between 221 and 204 lbf.in (2.50 and 2.31 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
(3) Purge the pipe with a nitrogen supply of 45 psi for one minute.
(4) Disconnect the remote nitrogen supply (3).

Subtask 36-11-57-420-051-A ** ON A/C NOT FOR ALL

C. Reconnect Engine Services

HPC Stage 10 Bleed Valve Solenoid ** ON A/C NOT FOR ALL

(1) Reconnect the solenoid P3 supply tube connector (2) to the solenoid valve (4).
(2) Reconnect the HPSOV supply line (1) to the main P3 supply line (5) at the connector (6).
(3) TORQUE the connectors (2) and (6) to between 221 and 204 lbf.in (2.50 and 2.31 m.daN )

.
(4) Wirelock the connectors (2) and (6) with lockwire (Material No.V02-126) .
(5) Re-secure any P-clips previously released in the vicinity of the solenoid.

5. Close-up
Subtask 36-11-57-410-051-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Remove the WARNING NOTICE(S).
(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 01:14:03 UTC