REPAIR THE PROBLEMS THAT YOU FIND.
YES
IF THE PROBLEM CONTINUES, REPLACE THE "EXTERNAL POWER -CONN" BULB L348.
NO
42 REPLACE THE "EXTERNAL POWER - NOT IN USE" BULB L349. IF THE PROBLEM CONTINUES,

YES REPAIR OR REPLACE THE WIRINGAND RELAYS BETWEEN PIN F OF THE EXTERNAL POWER RECEPTACLE AND THE BULB L349 (WDM 24-41-11,-13).
NO

3 TURN THE DC METERS SWITCH
ON THE P5-13 PANEL TO "BAT".
 DOES THE DC VOLTMETER SHOW
MORE THAN 20 VOLTS?

YES
SEE SHEET 2 (BLOCK 4)
AC External Power Does Not Operate Correctly Figure 101 (Sheet 1)
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A 737-300/400/500MAINTENANCE MANUAL
FROM SHEET 1 (BLOCK 3)
YES

NO
NO

21 PUSH THE "BAT" SWITCH TO
"ON".
PUSH THE "GRD POWER AVAIL-

YES ABLE" LIGHT.
 DOES THE "GRD POWER AVAIL-
ABLE" LIGHT COME ON?
YES

45 REPLACE THE BPP G7
(REF 24-41-21/401).

 IF THE PROBLEM CONTINUES, EXAMINE AND REPAIR THE WIRING BETWEEN THE BPP AND THE "GRD POWER AVAILABLE" BULB (WDM 24-41-11).
NO NO

5 PUSH THE "BAT" SWITCH TO
"ON".
DO THE "TRANSFER BUS OFF",

YES"BUS OFF", "GEN OFF BUS", AND "APU GEN OFF BUS" LIGHTS COME ON?

YES NO NO

23 TURN THE AC METERS SWITCH
SWITCH ON THE P13 FORWARDTO "GRD PWR".
ATTENDANT'S PANEL TO "ON". DOES THE AC VOLTMETER

DOES THE "EXTERNAL POWER -SHOW BETWEEN 105 AND 125 NOT IN USE" LIGHT ON THE P19 VOLTS? PANEL GO OFF?

6 PUSH THE "GROUND SERVICE"
YES YES

SEE SHEET 3
(BLOCK 7)

49 REPLACE THE BPP G7 (REF 24-41-21/401).
 IF THE PROBLEM CONTINUES, REPAIR OR REPLACE THE WIRING AND RELAYS (R348,R6,S12) BETWEEN PIN 25 OF THE CON-NECTOR D58 ON THE BPP AND PIN E ON THE EXTERNAL POWER RECEPTACLE (WDM 24-41-11 AND 24-41-12).
AC External Power Does Not Operate Correctly Figure 101 (Sheet 2)
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52 REPLACE THE BPP G7 (REF 24-41-21/401).
 IF THE PROBLEM CONTINUES,
REPAIR OR REPLACE THE WIRING
AND RELAYS (S1,R348,R351)
BETWEEN THE "GRD PWR" SWITCH
S1 AND THE EXTERNAL POWER CON-
TACTORS C891 AND C892
(WDM 24-41-11 AND 24-41-12).

FROM SHEET 2
(BLOCK 6)

YES NO NO7
PUSH THE "GRD PWR" SWITCH TO "ON".
 DO THE "TRANSFER BUS OFF" YESAND "BUS OFF" LIGHTS GO OFF?
YES NO25 TURN THE AC METERS SWITCH
TO "GRD PWR".
 DOES THE AC VOLTMETER SHOW
BETWEEN 105 AND 125 VOLTS?
YES 50 REPLACE THE APPLICABLE EXTERNAL POWER CONTACTOR 1 C891 OR CONTACTOR 2 C892 (REF 24-21-41/401).
 IF THE PROBLEM CONTINUES, DO THE TROUBLE-SHOOTING FOR THE AC GENERATION SYSTEM (REF 24-21-00/101).
NO
YES

CORRECTLY. TURN THE DC METERS SWITCH TO "TR1" REMOVE THE EXTERNAL POWER IF IT IS NOT NECESSARY (REF 24-22-00/201).
AC External Power Does Not Operate Correctly
Figure 101 (Sheet 3)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
PREREQUISITES:
MAKE SURE THESE CIRCUIT BREAKERS ARE OPEN: C32 FUELING AND EXTERNAL POWER CONTROL ON P6-5 C1075 EXTERNAL POWER CONTROL ON P6-5C813 GROUND SERVICE ON P6-11 C811 BUS PROTECTION PANEL ON P6-12
　
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