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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Bleed air isolation valve does not operate Ground pneumatic system check valve malfunctions APU system check valve malfunctions Valve jammed motor failed Poppet stuck Poppet stuck Test bleed air isolation valve (Ref 36-11-0, ADT/TEST), if valve positions are incorrect, check that valve is receiving power. Pressurize system from engines or APU. With isolation valve and bleed air valve(s) which control source, open, check for pressure loss, pressurize system through ground pneumatic connector. Check that system pressurizes. Pressurize system from engines or from ground pneumatic system having isolation valve and bleed air valve which controls pressure source open. Check for system pressure loss. Pressurize system using APU. Check that system pressurizes. IF not - If valve received power, replace valve (Ref 36-11-21) If no power, check circuitry (Ref Wiring Diagram) Replace valve (Ref 36-11-41) Replace check valve (Ref 3-11-51)
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TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Engine bleed Poppet stuck Pressurize system from ground Replace engine
check valves pneumatic connection with: bleed check
malfunction . 13th stage modulating & shutoff valve closed . Starter valve closed . Pack valves closed valve indicated open (by sound of rushing air at valve) (Ref 36-11-31)
. Wing TAI valves closed . Engine bleed air valve on engine being checked open – valve on other engine closed . Isolation valve open when checking engine #1 valves – closed when checking engine #2. Check to ensure system pressurizes. IF NOT -
Indication Limit switches Position air conditioning switches as Replace
system inoperative follows: overheat switch
malfunction . Isolation valve switch on . Engine bleed air switches off (Ref 36-11-71)
. Pack switches on with APU running and APU bleed switch on – Check no dual bleed on overhead panel. Turn pack switches off and No. 2 bleed switch on. With APU providing pressure to system, dual bleed, master caution & air condit annunciator lights illuminate.
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Indication system malfunction (Cont) Zener diodes malfunction Check lights dim Check reset and recall. Close isolation valve – warning lights extinguish Turn #2 engine bleed off and turn #1 engine bleed on – warning lights illuminate. Open isolation valve, turn #2 bleed switch on and turn off APU bleed switch – lights extinguish. (Ref Chap 33) Check power at applicable valve. Replace valve if power is available
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ENGINE BLEED AIR DISTRIBUTION SYSTEM -ADJUSTMENT/TEST
1. Engine Bleed Air Distribution System Test
A. General
(1)
The engine bleed air distribution system test is separated into six tests: two operational tests, and four duct leakage tests.
(2)
The operational tests are intended to ensure correct functioning of the electrical control components, circuit continuity and valve motor operation. Running engines is not necessary if ground electrical power is provided. Two operational tests are included. They may be accomplished concurrently or separately.
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