ENGINE BLEED AIR VALVE - REMOVAL/INSTALLATION
1. General
A. The engine bleed air valve is provided to shut off bleed air from engine bleed to the main manifold.
B. An engine bleed air valve is installed on the left side of each engine, downstream of the heat exchanger. The following procedure is applicable to each with any difference noted in the applicable step.
2. Remove Engine Bleed Air Valve (Fig. 401)
A. Gain access to valve by opening left engine cowl.
B. Open L or R BLEED AIR VALVES circuit breaker (P6-4).
C. Remove electrical connector and bonding jumper from valve.
D. Remove valve clamps.
WARNING: REMOVING DUCT CLAMPS WHILE AIR DUCTING IS PRESSURIZED MAY
CAUSE PERSONNEL INJURY AND/OR EQUIPMENT DAMAGE.
E. Remove valve.
3. Install Engine Bleed Air Valve (Fig. 401)
A. Position valve in line with duct with flow arrow pointing upward. Loosely install clamps.
B. Rotate valve as necessary to provide clearance with cowling, then tighten clamps.
C. Check that bonding surfaces are clean then install bonding jumper.
D. Install electrical connector.
E. On valves with manual lock out feature, check that manual override knob is in the unlock position.
NOTE: Some valves are equipped with a manual lockout feature associated with the manual override. On these valves the manual override knob must be rotated until the cross pin fits into the unlock groove to engage the valve motor (Ref manual override decal on valve actuator),
F. Close circuit breaker opened in 2.B.
G. Provide electrical power.
H. Check that applicable engine fire switch is in NORMAL position.
I. While observing position indicator at valve, move applicable engine BLEED switch to ON and check that valve opens.
J. Move switch to OFF and check that valve closes.
K. Pressurize pneumatic system by a ground pneumatic cart, an APU (Ref Chapter 49) or by engines (Ref Chapter 80).
L. Move ISOLATION VALVE switch to OPEN.
M. Move applicable engine BLEED switch to ON and check for leakage at engine bleed air valve duct clamps.
N. Remove pneumatic system pressure if no longer required.
O. Remove electrical power if no longer required.
P. Close left engine cowl.
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Feb 20/88 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 36-11-11 Page 401
F89608
Engine Bleed Air Valve Installation 500
36-11-11 Figure 401 Feb 15/70
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
ENGINE BLEED AIR ISOLATION VALVE - REMOVAL/INSTALLATION
1. General
A. The engine bleed air isolation valve is located in the pneumatic manifold position inside the keel-beam. Lightening holes are provided on the left and right side of the keel-beam to facilitate removal and installation of the valve (Fig. 401).
2. Remove Engine Bleed Air Isolation Valve (Fig. 401)
A. Open air conditioning equipment bay doors to gain access to valve.
B. Open BLEED AIR VALVES - ISOLATION circuit breaker (P6-4).
C. Remove electrical connector and bonding jumper from valve.
D. Remove duct clamps.
WARNING: REMOVING DUCT CLAMPS WHILE AIR DUCTING IS PRESSURIZED MAY CAUSE PERSONNEL INJURY AND/OR EQUIPMENT DAMAGE.
E. Remove valve through lightening hole left side of keel-beam by rotating valve until flanges are horizontal, then work out with actuator trailing.
3. Install Engine Bleed Isolation Valve
A. Check that valve bonding surface is clean then insert valve through left keel-beam lightening hole while observing through right keel-beam lightening hole. Locate valve between ducts so flow arrow is pointing to the right and rotate to position approximately as shown in Fig. 401.
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