EXTERNAL POWER RECEPTACLES (INSIDE VIEW)
B
AC External Power - Component Location
Figure 102 (Sheet 1)
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A
747-400
FAULT ISOLATION/MAINT MANUAL
P714 AUX/EXT NO. 1 POWER CENTER
SEE C
EXTERNAL POWER CONTACTOR 1, R12
P714 AUX/EXT NO. 1 POWER CENTER
C
P715 AUX/EXT
NO. 2 POWER
CENTER
SEE D
EXTERNAL POWER
TRANSFORMER
RECTIFIER UNIT A,
T97
EXTERNAL POWER
TRANSFORMER
RECTIFIER UNIT B,
T1FWD
EXTERNAL POWER TRANSFORMER
RECTIFIER UNITS
E
AC External Power - Component Location Figure 102 (Sheet 2)
EXTERNAL POWER TRANSFORMER RECTIFIER UNITS
SEE E
EXTERNAL
POWER
CONTACTOR 2,
R13
P715 AUX/EXT NO. 2 POWER CENTER
D
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A
747-400 MAINTENANCE MANUAL
AC EXTERNAL POWER - ADJUSTMENT/TEST
___________________________________
1. General_______
A. This section contains a task to do an operational test of the ac external power system. The operational test includes procedures for correct distribution and indication of the ac external power system.
B. For this operational test, you must connect the two external power receptacles to two different external power sources.
TASK 24-41-00-715-001
2. Operational Test - AC External Power (Fig. 501 and 502)____________________________________
A. General
(1)
Most of the switches and lights you must use are on the P5 overhead panel. Other panels you must use are identified in the procedure.
B.
References
(1)
24-22-00/201, Manual Control
(2)
45-10-00/201, Central Maintenance Computer System
(3)
WDM 24-41-12 thru 24-41-31
(4)
SSM 24-41-01 thru 24-41-03
C.
Access
(1)
Location Zone 118 Electrical and Electronics Compartment, RH 221 Control Cabin, LH
(2)
Access Panel
118A Electrical Power Receptacle Door
D.
Prepare for the Test
(1)
Apply external power to the airplane (Ref 24-22-00/201).
S 715-011
(2)
Test the indicator lights for the electrical system.
(a)
Set the IND LTS switch, on the P5 overhead panel, to TEST.
S 865-002
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A
747-400 MAINTENANCE MANUAL
SEE A
SEE B
ELECTRICAL SYSTEM CONTROL MODULE
A
POWER NOT IN
USE LIGHTS AC CONNECTED
LIGHT EXTERNAL POWER
AC CONNECTED RECEPTACLE DOOR
LIGHT
EXTERNAL POWER EXTERNAL POWER FWD
RECEPTACLE
RECEPTACLE
NO. 1 (D51) NO. 2 (D52)
EXTERNAL POWER RECEPTACLES
B
Electrical System Control Module/External Power Receptacle Location
Figure 501
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