NO

Automatic Shutdown - OVERSPEED Light Is On
Figure 138 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
AUTOMATIC/MANUAL  PREREQUISITES 
SHUTDOWN - FIRE  NONE 
WARNING INDICATION 

POSSIBLE CAUSES:
1.
APU FUEL SYSTEM PROBLEM (AMM 49-31-00/001)

2.
APU INTERNAL DAMAGE (AMM 49-11-00/401).

FAULT ISOLATION:

Automatic/Manual Shutdown - Fire Warning Indication
Figure 139

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES
MAKE SURE THIS SYSTEM WILL OPERATE: APU (AMM 49-11-00/201)
AUTOMATIC SHUTDOWN -NO APPARENT CAUSE

POSSIBLE CAUSES:
1.
APU CONTROL UNIT, M280, PROBLEM (AMM 49-61-11/401)

2.
EXTERNAL DAMAGE TO THE APU

3.
ADJUSTMENT OF THE APU AIR INLET (AMM 49-15-00/501)

4.
APU INTERNAL DAMAGE (AMM 49-11-00/401)

5.
ELECTRONIC SPEED SWITCH, S634, PROBLEM (AMM 49-61-22/401)

6.
P5-10 AIR CONDITIONING MODULE PROBLEM (AMM 21-51-01/401).

FAULT ISOLATION:
YES

1 DO A CHECK OF THE CIRCUIT
51 DO THIS PROCEDURE:
BREAKER FOR THE APU CONTROL CIRCUIT BREAKER ON THE APU
UNIT.CONTROL UNIT OPENS DURING THE
IS THE CIRCUIT BREAKER APU OPERATION (FIG. 109). OPEN?

NO NO

1A DO A CHECK OF THE
51A TIGHTEN, REPAIR OR REPLACE
CONNECTOR PINS FOR THE THE CONNECTOR AS NECESSARY.
ELECTRONIC SPEED SWITCH.
 ARE THE CONNECTOR PINS GOOD?

YES NO
2 MEASURE THE RESISTANCE AT
THE ELECTRONIC SPEED SWITCH,
S634, CONNECTOR D1245, FROM
PINS C TO D, J TO M, K TO L

(WDM 49-31-01).
ARE THE RESISTANCES 0-1 OHMS (MAXIMUM)?

COMPONENTS OF THE APU FUEL COMPONENTS AS NECESSARY.SYSTEM.
IS THERE DAMAGE TO OR LEAKAGE FROM THE COMPONENTS OFTHE APU FUEL SYSTEM?

NO SEE SHEET 2
(BLOCK 4)

Automatic Shutdown - No Apparent Cause
Figure 140 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
FROM SHEET 1 (BLOCK 3)

DOES THE OIL FILTER ELEMENT HAVE METAL PARTICLES?
NO NO

57 REPLACE THE P5-10 AIR CONDITIONING MODULE (AMM 21-51-01/401). YES

NO

21 START AND OPERATE THE APU58 DO THE APU USUAL SHUTDOWN (AMM 49-11-00/201). (AMM 49-11-00/201). DOES THE APU SHUTDOWN WITH CONTINUE THE APU NO APPARENT CAUSE? OPERATION.
YES
Automatic Shutdown - No Apparent Cause
Figure 140 (Sheet 2)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. APU WITH THE ELECTRONIC SPEED SWITCH ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A13301
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES
MAKE SURE THIS SYSTEM WILL OPERATE: APU (AMM 49-11-00/201)
AUTOMATIC SHUTDOWN -NO APPARENT CAUSE

POSSIBLE CAUSES:
1.
APU CONTROL UNIT, M280, PROBLEM (AMM 49-61-11/401)
　
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