S 212-150
(3)
Examine the external power supply cord and the airplane external power supply receptacle before you connect the external power supply to the receptacle. If you find excessive arc erosion, corrosion and heat damage or discoloration to the pins or receptacles, repair the problems that you find (AMM 24-41-03/401).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
24-22-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 432-003
WARNING:_______ TURN OFF THE EXTERNAL ELECTRICAL POWER SOURCE BEFORE YOU PUT
THE POWER CABLES INTO THE AIRPLANE RECEPTACLES. ELECTRICAL
ARCS CAN CAUSE INJURIES.
(4) Connect the power cables to the external power receptacles No. 1 (D51) and No. 2 (D52) on panel P36.
NOTE: If only one external power source is available, connect
____ the power cable to receptacle No. 1 (D51).
S 862-138
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
_______ FLAPS BEFORE YOU TURN THE POWER ON. THE FLAPS CAN AUTOMATICALLY MOVE WHEN YOU SUPPLY ELECTRICAL POWER.
(5)
Apply electrical power to the external power cables.
S 212-007
(6)
Make sure that the AC CONNECTED and POWER NOT IN USE lights on the P36 panel come on.
S 862-148
(7)
Set the battery switch to ON.
S 862-155
(8)
Set the STANDBY POWER switch to AUTO.
NOTE: Most of the switches and lights you must use are on the
____ P5 overhead panel. Other panels you must use will be identified in the procedure.
S 212-008
(9)
Set the BUS TIE 1, 2, 3, and 4 switches to AUTO.
S 212-009
(10)
Make sure that the AVAIL lights on EXT PWR 1 and EXT PWR 2 switches are on.
(11)
Push the EXT PWR 1 and EXT PWR 2 switches.
S 212-011
(12)
Make sure that the ON lights on EXT PWR 1 and EXT PWR 2 switches are on.
S 862-010
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 212-133
(13)
Look at panel P36 and make sure of these lights:
the POWER NOT IN USE lights are off
the AC CONNECTED lights are on.
S 212-013
(14)
Make sure that the ISLN lights on BUS TIE 1, 2, 3, and 4 switches are off.
S 212-154
(15)
If the L and R UTILITY switches are OFF, set the L and R UTILITY switches to ON.
S 212-117
(16)
Make sure that the OFF lights on L and R UTILITY switches are off.
S 862-170
(17)
You can set the BATTERY switch on the P5 overhead panel to OFF.
NOTE: This will keep the batteries from discharging if the external
____ source is interupped while the airplane is unattended.
TASK 24-22-00-862-015
3. Apply External Power to the Ground Handling Bus (Fig. 201)
_______________________________________________
A. General
(1) The ac ground handling bus is energized automatically when the external power No. 1 or the APU No. 1 are on. Before the ground handling bus is energized, BCU No. 1 makes sure that the available power is of good quality. The BCU then energizes the ground handling relays and the ground handling bus is on.
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