BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
FROM SHEET 1 FROM SHEET 1 (BLOCK 1) (BLOCK 23)
YES
NO YES
24 DO A CONTINUITY CHECK
AT THE APU FUEL VALVE, V43,
CONNECTOR D920, PINS 2
AND 4 (WDM 49-31-01).
IS THERE AN OPEN CIRCUIT?
NO
55 REPAIR THE CIRCUIT FROM
THE APU FUEL VALVE, V43,
CONNECTOR D920, PIN 4, TO THE
INLET DOOR ACTUATOR, M299,
CONNECTOR D922, PIN 1
(WDM 49-31-01).
2 MOVE THE APU MASTER SWITCH TO THE "ON" POSITION.
MAKE SURE THE AIR INLET DOOR FULLY OPENS.
DID THE AIR INLET DOOR FULLY OPEN?
YES
NO
NO YES
25 EXAMINE THE AIR INLET DOOR, INLET DOOR ACTUATOR AND THE RELATED PARTS.
YES
ARE THE PARTS DAMAGED OR CAUGHT? SEE SHEET 3
NO(BLOCK 26)
57 REPAIR OR REPLACE THE
PARTS THAT ARE NECESSARY
(AMM 49-15-22/401;
AMM 49-15-31/401).
The Air Inlet Door Does Not Fully Open or Does Not Fully Close
Figure 108 (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A13850
FROM SHEET 2 (BLOCK 3)
VALVE IS FULLY OPEN. APU FUEL VALVE DOES NOT FULLY
____NOTE: THE APU FUEL VALVE IS OPEN (FIG. 107).
ON THE REAR SPAR OF THE
LEFT WING IN THE WHEEL
WELL. THE MANUAL OVER-
RIDE HANDLE ON THE APU
FUEL VALVE GIVES AN
INDICATION OF THE VALVE
POSITION.
IS THE APU FUEL VALVE
FULLY OPEN?
CONNECTOR D920, PIN 3, TO THE
INLET DOOR ACTUATOR, M299,
CONNECTOR D922, PIN 2
(WDM 49-31-01).
The Air Inlet Door Does Not Fully Open or Does Not Fully Close
Figure 108 (Sheet 3)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A13851
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
CIRCUIT BREAKER ON PREREQUISITES THE APU CONTROL UNIT
MAKE SURE THIS SYSTEM WILL OPERATE:
OPENS DURING THE APU APU (AMM 49-11-00/201)
OPERATION
MAKE SURE THE AIRPLANE IS IN THIS CONFIGURATION: ELECTRICAL POWER IS ON (AMM 24-22-00/201)
POSSIBLE CAUSES:
1.
P5-10 AIR CONDITIONING MODULE PROBLEM (WDM 49-31-01)
2.
APU CONTROL UNIT, M280, PROBLEM (AMM 49-61-11/401)
3.
ELECTRONIC SPEED SWITCH, S634, PROBLEM (AMM 49-61-22/401)
4.
SEQUENCING PRESSURE SWITCH FOR THE OIL PROBLEM (AMM 49-61-41/401)
5.
FUEL SOLENOID VALVE PROBLEM (AMM 49-31-31/401)
6.
IGNITION UNIT PROBLEM (AMM 49-41-31/401)
7.
IGNITER CABLE PROBLEM (AMM 49-41-52/401)
8.
STARTER MOTOR, M161, PROBLEM (AMM 49-41-11/401)
9.
SURGE BLEED VALVE PROBLEM (AMM 49-52-41/401)
10.
3-WAY SOLENOID VALVE PROBLEM (AMM 49-52-61/401)
11.
INLET DOOR ACTUATOR PROBLEM (AMM 49-15-31/401)
12.
APU HARNESS PROBLEM
13.
APU FUEL VALVE, V43, PROBLEM (AMM 28-22-31/401)
14.
HOURMETER PROBLEM
15.
APU INTERNAL DAMAGE (AMM 49-11-00/401).
FAULT ISOLATION:
NO NO
1 START AND OPERATE THE APU
61 SET THE "R PACK" SWITCH TO (AMM 49-11-00/201).
THE "HIGH" POSITION FOR DID THE CIRCUIT BREAKER
2 MINUTES AND THEN TO THE
YES
OPEN DURING START?"OFF" POSITION. SET THE "L PACK" SWITCH TO
YES THE "HIGH" POSITION FOR
2 MINUTES AND THEN TO THE
SEE SHEET 4 "OFF" POSITION.
(BLOCK 2) IF THE APU ENGINE STOPS,
REPLACE THE P5-10 AIRCONDITIONING MODULE (WDM 49-31-01).
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