(d)
Remove the APU generator power from the ground service bus.
(e)
Supply the APU generator power to the 115V ac buses.
(f)
Remove the APU generator power from the 115v ac buses.
(2)
When the APU generator power quality is acceptable, the generator is automatically connected to the ac ground handling bus. Flight compartment switches allow manual control of APU generator power to the ac ground service, and/or main ac buses. Power to the ac ground service bus can also be applied by a switch on the forward attendant's panel P21.
B. References
(1)
AMM 27-61-00/201, Spoiler/Speedbrake Control System
(2)
AMM 49-11-00/501, Auxiliary Power Unit
C. Access
(1) Location Zones
212 Flight Compartment
D. Procedure
S 862-011
(1) Do these steps to supply the APU generator power to the ground handling bus:
NOTE: If both external and APU generator power are available,
____ external power is automatically chosen to supply the ac ground handling bus. External power must be removed to allow the APU generator to supply the ac ground handling bus.
(a)
Push the BAT switch on the P5 panel to the ON position.
(b)
Set the STBY POWER switch to the AUTO position.
(c)
Make sure the APU GEN switch on the P5 panel is in the OFF position.
(d)
Make sure the two BUS TIE switches on the P5 panel are in the ISLN position. 1) Make sure the yellow ISLN light in each switch is on.
(e)
Start the APU (AMM 49-11-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
S 862-039
(2) Do these steps to remove the APU Generator Power from the AC Ground Handling Bus:
(a)
Shut down the APU (AMM 49-11-00/201).
(b)
Set the STBY POWER switch to the OFF position.
(c)
Push the BAT switch on the P5 panel to the OFF position.
S 862-013
(3) Do these steps to supply the APU Generator Power to the AC Ground Service Bus:
NOTE: If the airplane is on the ground, the ground handling bus is
____ automatically energized when the APU generator power quality is satisfactory. If the right main ac bus is energized, the ac ground service bus is automatically energized from the right main ac bus.
(a)
Push the BAT switch on the P5 panel to the ON position.
(b)
Set the STBY POWER switch to the AUTO position.
(c)
Make sure the APU GEN CONT switch on the P5 panel is in the OFF position.
(d)
Make sure the two BUS TIE switches on the P5 panel are in the ISLN position. 1) Make sure the yellow ISLN light in each switch is on.
(e)
Start the APU (AMM 49-11-00/201).
(f)
Press the GND SERVICE switch on the left forward attendant's panel P21. 1) Make sure the light in the switch comes on.
S 862-038
(4)
Do these steps to remove the APU Generator Power from the AC Ground Service Bus:
(a)
Shut down the APU (AMM 49-11-00/201).
(b)
Set the STBY POWER switch to the OFF position.
(c)
Push the BAT switch on the P5 panel to the OFF position.
(5)
Do these steps to supply APU generator power to the main AC buses:
S 862-015
NOTE: If the airplane is on the ground, the ac ground handling bus
____ is automatically energized when the APU generator power is satisfactory. The AC ground service bus is automatically energized when the right main ac bus is energized.
(a)
Push the BAT switch on the P5 panel to the ON position.
(b)
Set the STBY POWER switch to the AUTO position.
(c)
Make sure the APU GEN switch on the P5 panel is in the OFF position.
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