J. Check that both PACK switches are in OFF position.
K. Move ISOLATION VALVE switch to AUTO and check for leakage at isolation valve duct clamps.
L. Remove pneumatic system pressure if no longer required.
M. Remove electrical power if no longer required.
N. Close air conditioning equipment bay doors.
Aug 15/76 36-11-21 Page 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
F89640
Engine BLeed Isolation Valve Installation 500
36-11-21 Figure 401 May 15/67
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
ENGINE BLEED CHECK VALVE - REMOVAL/INSTALLATION
1. General
A. The engine bleed check valves prevents reverse flow of the high spool bleed air into the eighth stage engine port.
B. The engine bleed check valves are mounted on the left and right side of each engine.
2. Remove Engine Bleed Check Valve
A. Gain access to check valve by opening respective engine cowl.
B. Remove V-band clamp from each end of valve body (Fig. 401).
C. Remove check valve.
3. Install Engine Bleed Check Valve
A. Deleted
B. Position check valve between duct flanges with flow direction arrow pointing downstream and hinge pin bosses pointing forward and aft (Fig. 401).
C. Install and tighten V-band clamps.
D. Close engine cowl.
500
Jun 20/91 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 36-11-31 Page 401
F89658
Engine Bleed Check Valve Installation 500
36-11-31 Figure 401 Feb 15/70
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
PNEUMATIC GROUND SERVICE CONNECTOR - REMOVAL/INSTALLATION
1. Remove Pneumatic Ground Service Connector
A. Open pneumatic ground service connector access door. (See figure 401.)
B. Remove attaching nuts.
NOTE: Keep bolts in place to avoid misplacement or damage to gasket No. 1.
C. Remove connector and gasket No. 2.
D. Reinstall nuts loosely.
E. Retain gasket No. 2 for installation.
2. Install Pneumatic Ground Service Connector
A. Remove nuts, keeping bolts in place.
B. Position gasket No. 2 and connector.
C. Install and tighten nuts.
D. Close access door.
501
Feb 15/71 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 36-11-41 Page 401
F89663
Pneumatic Ground Service Connector Installation 501
36-11-41Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 15/71
APU CHECK VALVE - REMOVAL/INSTALLATION
1. Remove Valve (Fig. 401)
A. Open air conditioning equipment bay doors to gain access to APU check valve.
B. Remove both V-band clamps and check valve from APU manifold duct.
2. Install Valve (Fig. 401)
A. Position APU check valve on duct with flow arrow pointing downstream.
B. Install V-band clamps and torque nuts from 45 to 55 pound-inches.
C. Close air conditioning equipment bay doors.
501
Aug 01/74 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 36-11-51 Page 401
F89667
APU Check Valve Installation 501
36-11-51 Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Aug 01/74
APU PRESSURE RELIEF VALVE - REMOVAL/INSTALLATION
1. Remove Valve (Fig. 401)
A. Open access panel 3701 to gain access to APU pressure relief valve.
B. Remove lockwire.
C. Unscrew valve and remove with packing ring from mounting boss on APU manifold duct.
2. Install Valve (Fig. 401)
A. Replace packing ring on APU pressure relief valve.
B. Screw valve into mounting boss on duct, tighten and lockwire.
C. Close access panel.
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