YES
YES
48 EXAMINE THE CIRCUIT FROM
90 REPAIR THE PROBLEMS THAT
THE INLET DOOR ACTUATOR, M299, YOU FIND.
CONNECTOR D922, PIN 1, TO THE IF THE PROBLEM CONTINUES,
APU CONTROL UNIT, M280, REPLACE THE INLET DOOR
CONNECTOR D50B, PIN 49 ACTUATOR, M299
(WDM 49-31-01). (AMM 49-15-31/401).
IS THERE A SHORT CIRCUIT?
NO
YES
49 EXAMINE THE CIRCUIT FROM
91 REPAIR THE PROBLEMS THAT
THE APU FUEL VALVE, V43, YOU FIND.
CONNECTOR D920, PINS 1,2,4, IF THE PROBLEM CONTINUES,
TO THE APU CONTROL UNIT, M280, REPLACE THE APU FUEL VALVE,
CONNECTOR D50B, PINS 8,13,27 V43 (AMM 28-22-31/401).
(WDM 49-31-01).
IS THERE A SHORT CIRCUIT?
NO
YES
50 EXAMINE THE CIRCUIT FROM
THE STARTER MOTOR, M161, TO
THE APU CONTROL UNIT, M280
(WDM 49-31-01).
IS THERE A SHORT CIRCUIT?
NO
NO
YES
NO52 MANUALLY TURN THE APU (AMM 49-21-00/201).
ARE THERE UNUSUAL NOISES
WHEN THE APU TURNS OR DOES THE
APU NOT TURN AS USUAL?
YES
Circuit Breaker on the APU Control Unit
Opens during the APU Operation
Figure 109 (Sheet 7)
E06204
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. APU WITH THE ELECTRONIC SPEED SWITCH ú
49-00-00
PART NUMBER 305593 ú
ú 03 Page 130
ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CIRCUIT BREAKER ON THE APU CONTROL UNIT OPENS DURING THE APU OPERATION
POSSIBLE CAUSES:
PREREQUISITES
MAKE SURE THIS SYSTEM WILL OPERATE: APU (AMM 49-11-00/201)
MAKE SURE THE AIRPLANE IS IN THIS CONFIGURATION: ELECTRICAL POWER IS ON (AMM 24-22-00/201)
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 (AMM 49-11-00/201).
DID THE CIRCUIT BREAKER
YESOPEN DURING START?
YES SEE SHEET 2
(BLOCK 22)
SEE SHEET 4
(BLOCK 2)
61 SET THE "R PACK" SWITCH TOTHE "HIGH" POSITION FOR 2 MINUTES AND THEN TO THE "OFF" POSITION.
SET THE "L PACK" SWITCH TO THE "HIGH" POSITION FOR 2 MINUTES AND THEN TO THE "OFF" POSITION.
IF THE APU ENGINE STOPS, REPLACE THE P5-10 AIR CONDITIONING MODULE (WDM 49-31-01).
IF THE APU ENGINE OPERATES, DO THE APU USUAL SHUTDOWN (AMM 49-11-00/201).
THE SYSTEM IS OK.
Circuit Breaker on the APU Control Unit
Opens during the APU Operation
Figure 109A (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. APU WITH THE ELECTRONIC SPEED SWITCH ú
49-00-00
PART NUMBER 3876259 ú
ú 02 Page 131
ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
L37227
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
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