Stage 10 Air Solenoid Valve - Valve and Sense Line Purging Procedure

TASK 36-11-57-280-020-A
Stage 10 Air Solenoid Valve - Valve and Sense 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 and an alternative purge procedure for the solenoid valve and sense line.

NOTE: If time allows and the C-duct can be opened, it is beneficial if the sense line and solenoid are purged simultaneously.

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, 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	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)
TASK 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
TASK 78-32-00-410-010-A	Closing of the Thrust Reverser Halves
HPC Stage 10 Bleed Valve Solenoid
HPC Stage 10 Bleed Sense Line
Bleed Valve Test Set

3. Job Set-up
Subtask 36-11-57-941-054-A ** ON A/C NOT FOR ALL

A. Safety Precautions

NOTE: This procedure requires only one air hose to be connected from the IAE2R19437 TEST SET - BLEED VALVE. This provides air to move the plunger within the solenoid. The test set cannot provide sufficient flow to purge the solenoid and HPSOV/PRV sense line. A remote nitrogen/dry air source is required for this.

(1) Make sure that the engine 1(2) shutdown occurred 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) in position to tell persons not to operate the pneumatic system.

(3) On the ENG panel 115VU:

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

(4) On the HP ground connector:

Put a WARNING NOTICE(S) in position 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) in position to tell persons not to energize the FADEC 1(2).

Subtask 36-11-57-010-055-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.

Subtask 36-11-57-010-056-A ** ON A/C NOT FOR ALL

C. Open the Thrust Reverser Halves (C-Ducts) if required (Ref. AMM TASK 78-32-00-010-010).

4. Procedure
Subtask 36-11-57-020-055-A ** ON A/C NOT FOR ALL

A. Disconnect the HPSOV Sense Line at the Solenoid and Bifurcation Panel

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

HPC Stage 10 Bleed Sense Line ** ON A/C NOT FOR ALL

NOTE: To prevent the possibility of purging air blowing contamination into the solenoid, the sense line should be disconnected from the solenoid.

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) Cut and discard the lockwire and disconnect the HPSOV sense line (4) at the solenoid (2). Make sure that the purging flow is not directed into the solenoid.
(2) Cut and discard the lockwire, and disconnect the HPSOV sense line (17) at the bifurcation panel (18). It is not necessary to disconnect the sense line flange from the bifurcation panel. Make sure that sufficient access is afforded to connect the purge supply.

Subtask 36-11-57-160-053-A ** ON A/C NOT FOR ALL

B. Purge the HPSOV Sense Line

HPC Stage 10 Bleed Sense Line ** ON A/C NOT FOR ALL

(1) Connect the FILLING EQUIPMENT - NITROGEN, PRESSURE REGULATED GAGE (19) to the HPSOV sense line flange (20).
(2) Apply the purging flow at 45 psi for approximately three minutes.
(3) Switch off the purging flow and disconnect the remote nitrogen supply (19).

Subtask 36-11-57-020-056-A ** ON A/C NOT FOR ALL

C. Disconnect the P3 Supply Line and Electrical Connector at the Solenoid

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

(1) Cut and discard the lockwire, and disconnect the P3 supply line (1) at the solenoid (2). Make sure that sufficient access is afforded to connect the test set hose.
(2) Disconnect the engine electrical connector (3) from the solenoid.

Subtask 36-11-57-480-052-A ** ON A/C NOT FOR ALL

D. Connect the IAE2R19437 TEST SET - BLEED VALVE and the Remote Nitrogen Supply

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

Bleed Valve Test Set ** ON A/C NOT FOR ALL

(1) Set the TEST SELECT switch (5) to SOLENOID.
(2) Set the PRESSURE/VACUUM switch (6) to PRESSURE.
(3) Set the SELECT VENT switch (7) to OPEN, then to CLOSE.
(4) Connect the test set red hose (8) to the test set SOLENOID INPUT quick-release coupling (9). Connect the other end of the test hose to the solenoid supply connector (10).
(5) Connect the remote nitrogen source (11) to the HPSOV solenoid sense line connector (Ref. AS15702).
(6) TORQUE the test hose connector and the remote nitrogen supply connector to between 221 and 204 lbf.in (2.50 and 2.31 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
(7) Set the POWER switch (13) to OFF.
(8) Connect the test set electrical test lead (12) to the IAE2R19437 TEST SET - BLEED VALVE and solenoid.

Subtask 36-11-57-160-054-A ** ON A/C NOT FOR ALL

E. Purge the Stage 10 Air Solenoid Valve (Cabin Air Solenoid)

Bleed Valve Test Set ** ON A/C NOT FOR ALL

NOTE: When you operate the hand pump, wait three seconds after each stroke. This allows air to flow into the pump valves and makes the task easier.

(1) Operate the test set hand pump to get a pressure of 25 psi indicated on the SOLENOID INPUT gauge. Make sure that this pressure is maintained.
(2) Pressurize the remote nitrogen supply to 45 psi.
(3) Set the POWER switch (13) to ON. The green CONTINUITY lamp should illuminate.

NOTE: When the TEST SWITCH (16) is depressed, the SOLENOID INPUT gauge pressure will reduce to a different value. This is normal.

(4) Depress and hold the TEST SWITCH (16). Air should immediately vent through the exhaust vent (15). Continue to keep the TEST SWITCH pressed for approximately two minutes to make sure that sufficient purging flow passes through the valve.
(5) Release the TEST SWITCH (16). Air should immediately stop venting through the exhaust vent (15).
(6) Set the POWER switch (13) to OFF. The CONTINUITY lamp should extinguish.
(7) Shut off the remote nitrogen supply.

Subtask 36-11-57-080-052-A ** ON A/C NOT FOR ALL

F. Disconnect the Test Set

Bleed Valve Test Set ** ON A/C NOT FOR ALL

(1) Set the SELECT VENT switch (7) to OPEN. This will vent the excess pressure in the test set.
(2) Disconnect the red test hose from the solenoid supply connector (10) and the test set quick-release connector (9).
(3) Disconnect the remote nitrogen supply (11).
(4) Disconnect the electrical test lead (12) from the solenoid and the IAE2R19437 TEST SET - BLEED VALVE.

Subtask 36-11-57-420-053-A ** ON A/C NOT FOR ALL

G. Reconnect the Engine Services

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

HPC Stage 10 Bleed Sense Line ** ON A/C NOT FOR ALL

(1) Reconnect the solenoid P3 supply tube connector (1) to the solenoid valve (2).
(2) Reconnect the HPSOV sense line connector (4) to the solenoid.
(3) Reconnect the engine electrical connector (3) to the solenoid.
(4) Reconnect the HPSOV sense line connector (17) to the HPSOV sense line flange (20).
(5) TORQUE the connectors (1), (4) and (17) to between 221 and 204 lbf.in (2.50 and 2.31 m.daN )

.
(6) Safety the connectors (1), (4) and (17) with lockwire (Material No.V02-126) .
(7) Re-secure any P-clips previously released in the vicinity of the solenoid and bifurcation panel.

Subtask 36-11-57-410-054-A ** ON A/C NOT FOR ALL

H. Close Access
(1) Close the thrust reverser halves (C-ducts) if required (Ref. AMM TASK 78-32-00-410-010).
(2) 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.
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 01:14:04 UTC