Neutral Pin to Airplane Ground Stud Continuity Check Exceeds 0.1 Ohms Figure 102
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24-41-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
G99192
A
737-300/400/500MAINTENANCE MANUAL
AC EXTERNAL POWER - ADJUSTMENT/TEST
___________________________________
TASK 24-41-00-715-004
1. AC External Power - Operational Test____________________________________
A. General
(1)
This task will make sure that the most important parts of the external power system operate correctly. The most important parts of the external power system are:
(a)
The bus protection panel (BPP) G7,
(b)
The external power receptacle,
(c)
The external power contactors C891 and C892,
(d)
The external power relay R348,
(e)
The ground service relay R6,
(f)
The GRD PWR switch S1,
(g)
And the GROUND SERVICE switch S12.
B.
Standard Tools and Equipment
(1)
External Power Supply - 115/200 volts ac, 3-phase, 400 Hz
C.
References
(1)
24-22-00/201, Manual Control
(2)
24-41-00/101, AC External Power
D.
Access
(1)
Location Zones 101 Left Control Cabin - P5 forward overhead panel 102 Right Control Cabin - P6 load control center panel 115 Cargo Door - P13 forward attendant's panel 202 Lower Nose Compartment - P19 external power panel 402 Right Wing - outboard leading edge
(2)
Access Panels
1101 External Power Receptacle Door
6540 Refueling Station Access Door
E.
Prepare for the Operational Test.
S 865-012
(1) Make sure that no electrical power is on the airplane (Ref 24-22-00/201).
(a)
Make sure that the GRD PWR, GEN, and APU GEN switches on the P5-4 panel are in the OFF position.
(b)
Make sure that the GROUND SERVICE switch on the P13 forward attendant's panel is in the OFF position.
(c)
Make sure that the BAT switch on the P5-13 panel is in the OFF position.
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A 737-300/400/500MAINTENANCE MANUAL
S 865-006
(2)
Make sure that the STANDBY POWER switch on the P5-5 panel is in the AUTO position.
S 865-007
(3)
Make sure that the BUS TRANS switch on the P5-4 panel is in the AUTO position.
S 865-013
(4)
Make sure that the circuit breaker on the front face of the BPP on the P6 panel is closed.
S 865-014
(5)
Make sure that these circuit breakers are closed:
(a)
P6-5 panel
1) C32, FUELING AND EXTERNAL POWER CONTROL
2) C1075, EXTERNAL POWER CONTROL
(b)
P6-11 panel
1) C813, GROUND SERVICE
(c)
P6-12 panel
1) C811, BUS PROTECTION PANEL
2) C812, GROUND SERVICE - EXTERNAL POWER
S 865-023
(6) Turn the DC meters switch on the P5-13 panel to BAT.
(a) Make sure the DC voltmeter shows 24 | 4 volts.
S 865-015
(7) Make sure that the refueling station access door is closed.
F. Procedure
S 015-008
(1) Open the external power receptacle door.
S 495-016
WARNING: BEFORE YOU CONNECT THE EXTERNAL POWER CABLE TO THE AIRPLANE,
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