S 085-041

 (14)
 When the test of the lightning protectors is completed do the following steps:

 (a)  
Disconnect the ground lead of the test set (gray lead) from the X2 terminal of the lightning protector.

 (b)  
Disconnect the test-pulse output lead (blue lead) of the test set from the X1 terminal of the lightning protector.

 (c)  
Disconnect the input power lead (red lead) from the 115V, 400 Hz source.

 (d)  
Disconnect the chassis ground lead (green lead) of the test set from the airplane frame ground.

 S 035-039
 (15)
 Connect the airplane electrical leads to the X1 terminals of the lightning protectors.

 (16)
 Close the circuit breakers on the P515, P514, P614 and P615 panels.

 S 085-042
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 MANUAL CONTROL - DESCRIPTION AND OPERATION
__________________________________________
 1.  General_______
 A.  The manual control system provides a means of controlling the electrical power generating system operation by utilizing switches provided on the flight deck control panel, thereby directing the automatic functions of the various control switches.
 2.  Electrical System Control Module (Fig. 1)________________________________
 A.  Switches are provided on the electrical system control module for manually selecting and monitoring the operating status of the functions selected by the operator.
 (1)  
Generator Control Switches (Gen Cont)

 (a)  
The generator control switch is a latched, alternate action switch. When depressed to the latched (ON) position, the electrical power generating system is directed to place the 115 volt ac power from the integrated drive generator onto the ac bus. The release (OFF) position removes the integrated drive generator voltage from the ac bus.

 (2)  
Generator Drive Disconnect Switches (Drive Disc)

 (a)  
The generator drive disconnect switch is a protected momentary action switch that controls mechanical disconnection of the integrated drive generator from the engine gearbox.

 (3)  
Bus Tie Breaker Switches (Bus Tie)

 (a)  
The bus tie breaker switch is a latched, alternate action switch. When depressed to the latched (AUTO) position, automatic paralleling of the ac buses occurs. The release (ISLN) position isolates the selected bus from the other ac buses.

 (4)  
APU Generator Control Switches (APU GEN)

 (a)  
The APU generator switch is a momentary switch. Actuation alternately allows APU generator power to be applied or removed from the ac buses.

 (5)  
External Power Control Switches (EXT PWR)

 (a)  
The EXT PWR switch is a momentary switch. Actuation alternately allows external power to be applied or removed from the ac buses.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

GENERATOR FIELD MANUAL RESET MODULE
SEE B
ELECTRICAL SYSTEM CONTROL MODULE
SEE A
FLIGHT COMPARTMENT

ELECTRICAL SYSTEM CONTROL MODULE GENERATOR FIELD MANUAL RESET MODULE (EXAMPLE)
A B
Electrical System Control Location Figure 1
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400
　
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