H28439
Modulating and Shutoff Valve Installation 500
21-11-11 Figure 401 May 15/67
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
PACK VALVE - REMOVAL/INSTALLATION
1. General
A. The pack valves shut off or admit flow of air from the pneumatic manifold to the air conditioning system. The pack valves are located in the left and right air conditioning equipment bay.
2. Remove Pack Valve (Fig. 401)
A. Open air conditioning equipment bay access door to gain access to valve.
B. Remove duct clamps and disconnect support clamp of hot air duct forward of mixing valve.
C. Remove hot air duct.
D. Disconnect electrical connections and bonding jumper from valve.
E. Disconnect sensing lines at pack valve.
F. Remove aft and forward clamp from valve.
G. Remove valve by sliding straight down.
3. Install Pack Valve (Fig. 401)
A. Manipulate valve in position with arrow pointing aft.
B. Install forward clamp on valve; do not tighten.
C. Rotate valve as required to line up with pressure sensing lines and to permit clear access to the test ports. The heat detector wire may be locally moved or bent.
D. Install aft clamp on valve; do not tighten.
E. Rotate forward clamp as required so clamp nut can be tightened from outboard.
F. Connect pressure sensing lines.
G. Tighten forward and aft clamps.
H. Connect electrical connection and bonding jumper.
Aug 15/73 21-11-21 Page 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
I. Locate hot air duct in support so duct ends align with mix valve and cold air check valve.
J. Install forward and aft clamps of hot air duct.
K. Tighten support clamp.
L. Test pack valve operation. Refer to Engine Bleed Air Compression Control System Adjustment/Test, or, if preferred, accomplish Test Set Procedure No. 3 of Engine Bleed Air compression Control System – Troubleshooting, 21-11-0.
M. Close air conditioning equipment bay access doors.
H29675
Pack Valve Installation 511
21-11-21 Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Aug 15/73
PRESSURE REGULATOR - REMOVAL/INSTALLATION
1. General
A. The pressure regulator controls the modulation of 13th stage bleed flow in conjunction with the flow through the pack valve.
B. The pressure regulator is mounted on the right side of each engine above the 13th stage valve.
2. Remove Pressure Regulator (See figure 401.)
A. Gain access to regulator by opening right engine cowl.
B. Disconnect sensing and pressure lines.
C. Remove mounting bolts from mounting bracket.
D. Remove regulator.
3. Install Pressure Regulator (See figure 401.)
A. Position regulator on mounting bracket.
B. Install mounting bolts.
C. Connect sensing and pressure lines.
D. Test pressure regulator. Engine Bleed Air Compression Control System - Adjustment/Test, or, if preferred, accomplish Test Set Procedure No. 2 of Engine Bleed Air Compression Control System - Trouble Shooting, 21-11-0.
E. Close engine cowl.
500
Feb 15/69 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 21-11-31 Page 401
H28440
Pressure Regulator Installation 500
21-11-31 Figure 401 May 15/67
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
AIR CLEANER SYSTEM - DESCRIPTION AND OPERATION
1. General
A. An air cleaner system is provided to purge the engine bleed air from engines No. 1 and No. 2 of impurities. The system consists of two similar subsystems which function automatically whenever engine bleed air is used for air conditioning, and the airplane is on the ground or the flaps are extended. Each subsystem consists of an inertial type air cleaner and purge air ducting, an electrically controlled pneumatically operated purge valve and an electrical control system. The impurities collected by the cleaner are vented overboard through the ram air exit louvers. The air cleaners are located in the pneumatic manifold outboard of the duct to each air cycle system. (See figure 1.)
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