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757 MAINTENANCE MANUAL
(d)
Make sure the two BUS TIE switches on the P5 panel are set to ISLN position. 1) Make sure the yellow ISLN light in each switch is on.
(e)
Make sure the two yellow BUS OFF lights on the P5 panel are on.
(f)
Start the APU (AMM 49-11-00/201).
(g)
Push the APU GEN switch (P5) to the ON position.
(h)
Make sure the yellow OFF light in the APU GEN switch on the P5 panel is off.
(i)
Push the left BUS TIE switch on the P5 panel to the AUTO position to energize the left 115V ac bus. 1) Make sure the (L BUS) BUS OFF light on P5 is off.
(j)
Push the right BUS TIE switch on the P5 panel to AUTO position to energize the right 115v ac bus.
NOTE: The AC ground service bus is automatically energized by
____ the right main ac bus.
1) Make sure the (R BUS) BUS OFF light on P5 is off.
(k) Do these steps to supply power to the utility/galley buses: 1) Push the applicable L or R UTILITY BUS switch on the P5
panel to the ON position. 2) Make sure the yellow OFF light in the switch is off.
S 862-017
(6) Do these steps to remove the APU generator power from the main AC buses:
(a)
Push the two BUS TIE switches on the P5 panel to the ISLN position. 1) Make sure the yellow ISLN light in each switch comes on.
(b)
Make sure the two yellow BUS OFF lights on the P5 panel are on.
(c)
Push APU GEN switch on P5 panel to the OFF position.
(d)
Shutdown the APU (AMM 49-11-00/201).
(e)
Set the STBY POWER switch to the OFF position.
(f)
Push the BAT switch on the P5 panel to the off position.
TASK 24-22-00-862-003
4. Supply and Remove Integrated Drive Generator Power
__________________________________________________
A. General
(1) This task has these parts:
(a) Supply the IDG power to the 115V ac buses.
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757 MAINTENANCE MANUAL
(b) Remove the IDG power from the 115V ac buses.
(2)
The integrated drive generator (IDG) is used to energizes the main ac buses and the ground service bus. The IDG cannot be used to energize the ac ground handling bus.
(3)
Normally each engine IDG supplies power to one main ac bus of the electrical system. One engine IDG can, however, supply electrical power to both main ac buses.
B. References
(1)
AMM 27-61-00/201, Spoiler/Speedbrake Control System
(2)
AMM 71-00-00/501, Power Plant
C. Access
(1) Location Zones
212 Flight Compartment
D. Procedure
S 862-018
(1) Do these steps to supply the IDG Power to the main AC buses:
(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 two yellow BUS OFF light on the P5 panel are on.
(d)
Do these steps to energize the left 115V ac bus with the left generator power: 1) Make sure the yellow DRIVE light in L GEN DRIVE DISC switch
on the P5 panel is on. 2) Operate the left engine (AMM 71-00-00/201).
CAUTION: MAKE SURE THE YELLOW DRIVE LIGHT IN THE L GEN DRIVE
_______ DISC SWITCH (P5) GOES OFF AFTER YOU START THE ENGINE. HIGH OIL OUT TEMPERATURE OR LOW OIL PRESSURE CAN CAUSE DAMAGE TO THE IDG.
3) Make sure the yellow DRIVE light in the L GEN DRIVE DISC switch is off. a) If the DRIVE light in the L GEN DRIVE DISC switch comes
on, push the L GEN DRIVE DISC switch and stop the engines (AMM 71-00-00/201).
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