(f)  
Do a check of the APU generator voltage output. 1) Set the AC meter selector switch on the forward overhead panel P5-13 to APU GEN. 2) Momentarily set the two APU GEN switches on the P5-4 panel

 to ON. 3) Make sure that the APU GEN OFF BUS light goes off. 4) Make sure the AC voltmeter shows 110 to 125 volts and the
 CPS FREQ meter shows 397-417 Hz.
 (g)  Put the airplane back in its usual condition. 1) Stop the APU (AMM 49-11-00/201).
 TASK 24-21-21-004-094
 4. APU Generator Removal (APU Removed) (Fig. 401)
___________________________________
 A. References
 (1)  AMM 49-11-00/401, APU Power Plant
 B. Access
 (1)  
Location Zone
 303 APU Compartment

 (2)  
Access Panel
 3804 APU Cowl Panel

 C. Procedure
 S 014-024
 (1)  Remove the APU (AMM 49-11-00/401), if you did not do this before.
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 ALL  ú ú 03 Page 408 ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
GENERATOR
GENERATOR
SEEA
SEE B
TERMINAL
COVER SCREW
(4 PLACES)

GENERATOR OUTPUT CONNECTOR
CONTROL 
GENERATOR  CONNECTOR 
TERMINALS 
B1 
B2 
B3 

EXCITER TERMINALS
(COVER REMOVED)

CURRENT TRANSFORMER MOUNT ASSEMBLY
DUCT SUPPORT BRACKET
GROUND BUS BAR ANGLE
DIFFERENTIAL CURRENT TRANSFORMER
GROUND LEAD
DIFFERENTIAL CURRENT TRANSFORMER CONNECTOR
FWD
____COOLING AIR CROSSOVER DUCT OMITTED.
NOTE:
APU AC Generator Installation Figure 401 (Sheet 1)
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 24-21-21
 THE APU GENERATOR FEEDER CABLES  ú
 (BEFORE SB 1076)  ú 01 Page 409 ú Mar 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
SEE  A 
GENERATOR 
AC GENERATOR  TERMINALS 
EXCITER TERMINALS 
(COVER REMOVED) 
CURRENT 
TRANSFORMER 
MOUNT ASSEMBLY 
DUCT SUPPORT 
BRACKET 
B1 
B2  BAR ANGLE GROUND BUS 
SEE  B  B3  CURRENT DIFFERENTIAL 
TRANSFORMER 
TERMINAL  GROUND 
COVER SCREW  LEAD 
(4 PLACES) 
DIFFERENTIAL 
CURRENT 
TRANSFORMER 
CONNECTOR 

GENERATOR GENERATOR
OUTPUT CONTROL
CONNECTOR CONNECTOR
NOTE:COOLING AIR CROSSOVER DUCT OMITTED.
APU AC Generator Installation
Figure 401 (Sheet 2)

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 24-21-21
 THE APU GENERATOR FEEDER CABLES  ú
 (AFTER SB 1076)  ú 01 Page 410 ú Mar 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
ELECTRICAL CONNECTOR  A 737-300/400/500MAINTENANCE MANUAL COOLING AIR CROSSOVER DUCT AFT DUCT CLAMP (LEFT SIDE) 
OF GENERATOR) (FORWARD END MOUNTING BOLT CROSSOVER DUCT 
FUEL LINE 
OVERTEMPERATURE CONTROL SWITCH 
COOLER  FWD 
A  FORWARD AND AFT APU COOLER CLAMPS  GENERATOR 
MOUNTING FLANGE APU GENERATOR  (12 LOCATIONS) APU GENERATOR MOUNTING NUTS AND STUDS 
INDEX MARK APU AND GENERATOR FLANGES; TO CORRECTLY CLOCK-POSITION GENERATOR AT INSTALLATION 
B  FWD 
Figure 401 (Sheet 3) APU AC Generator Installation 

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