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H56672
FROM SHEET 2 (BLOCK 5)
YES

YES
NO
6
DID THE "OVERSPEED" SHUT-
23 MEASURE THE RESISTANCE AT
DOWN OCCUR IN LESS THAN THE TACHOMETER GENERATOR,
30 SECONDS FROM THE TIME THE CONNECTOR D1262, FROM PIN A TO
APU IS STARTED? PIN B (WDM 49-41-01).

IS THE RESISTANCE
NO
15-35 OHMS?
YES 49-41-01).

YES
24 REPLACE THE FUEL CONTROL
UNIT (AMM 49-31-11/401).
 START AND OPERATE THE APU (AMM 49-11-00/201).
 DID THE APU START AND OPERATE CORRECTLY?
NO

61 REPLACE THE APU (AMM 49-11-00/401).
OVERSPEED Light Is On when the APU Master Switch Is in the OFF Position Figure 102 (Sheet 3)
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H55464
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
PREREQUISITES
MAKE SURE THE AIRPLANE IS IN THIS CONFIGURATION: ELECTRICAL POWER IS ON (AMM 24-22-00/201)
APU INDICATION LIGHTS ON THE P5 FORWARD OVERHEAD PANEL DO NOT COME ON WITH THE PRESS-TO-TEST

POSSIBLE CAUSES:
1.
LIGHT BULB

2.
LAMP ASSEMBLY.

FAULT ISOLATION:
YES

1 FOR EACH APU INDICATION

LIGHT THAT DID NOT COME ON, DO
A CHECK OF THE LIGHT BULB.
 IS THE LIGHT BULB OK?

APU Indication Lights on the P5 Forward Overhead Panel
Do Not Come On with the Press-To-Test
Figure 103

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BATTERY VOLTAGE IS  PREREQUISITES 
LESS THAN 22 VOLTS  MAKE SURE THIS SYSTEM WILL OPERATE: 
WITH THE "BAT" SWITCH  APU (AMM 49-11-00/201) 
IN THE "ON" POSITION  MAKE SURE THE AIRPLANE IS IN THIS CONFIGURATION: 
AND NO AC POWER ON  ELECTRICAL POWER IS ON (AMM 24-22-00/201) 
THE CHARGER 

POSSIBLE CAUSES:
1.
BATTERY PROBLEM (AMM 24-31-11/201)

2.
BATTERY LOW ON CHARGE.

FAULT ISOLATION:
NO

1 START THE APU
(AMM 49-11-00/201).

NOTE:DO NOT TRY TO START THE APU MORE THAN ONE TIME WITH THE BATTERY VOLT-AGE LESS THAN 22V.
DID THE APU START?
YES

NO
21 SUPPLY EXTERNAL ELECTRICAL
POWER (AMM 24-22-00/201) AND
FULLY CHARGE THE BATTERY.

DID THE BATTERY VOLTAGE INCREASE TO MORE THAN 22V?
YES

53 OPERATE THE APU WITH THE "APU GEN" SWITCHES ON THE P5 FORWARD OVERHEAD PANEL IN THE "ON" POSITION UNTIL THE BATTERY IS FULLY CHARGED.
NOTE:WHEN THE BATTERY IS FULLY CHARGED, THE CHARGER SENDS A SERIES OF SHORT PULSES TO THE POSITIVE SIDE OF THE "DC AMPS" METER.
Battery Voltage is Less Than 22 Volts with the BAT Switch in the
ON Position and No AC Power on the Charger
Figure 104

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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 THE AIRPLANE IS IN THIS CONFIGURATION: ELECTRICAL POWER IS ON (AMM 24-22-00/201)
BATTERY VOLTAGE IS LESS THAN 26 VOLTS WITH AC POWER ON THE CHARGER

POSSIBLE CAUSES:
1.
BATTERY PROBLEM (AMM 24-31-11/201)

2.
　
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