C. Procedure
S 434-013
(1)
Install the square washers on the terminal block.
(2)
Install the terminal block.
S 424-014
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CAUTION:_______ PUT THE SQUARE WASHERS BELOW THE THROUGH-LEAD STRAPS. IF
YOU INSTALL THE WASHERS INCORRECTLY, THE IDG WILL BECOME
TOO HOT.
(a) Put the square washers below the through-lead straps.
S 434-015
(3) Install the terminal block screws.
(a) Torque the screws to 20-22 pound inches.
S 434-016
(4)
Install the phase leads to the terminal block.
S 434-017
(5)
Install the spirolox nuts, the self-locking nuts, or the washers and terminal nuts on the terminal studs.
CAUTION:_______DO NOT PUT ANY WASHERS BELOW THE PHASE LEADS. IF YOU PUT WASHERS BELOW THE PHASE LEADS, THE TERMINAL BLOCK WILL BECOME TOO HOT.
(a)
Make sure the circular washers are between the terminal nuts and the phase leads.
(b)
Torque the terminal nuts to 12-14 pound feet.
S 434-019
(6) Install the terminal block cover and connect with washers and screws.
(a) Torque the screws to 20-22 pound inches.
S 414-020
CAUTION: OBEY THE PRECAUTIONS FOR THE KEVLAR WRAPPING ON THE FAN CASE
_______ WHEN YOU CLOSE THE FAN COWL PANEL. IF YOU DO NOT OBEY THE PRECAUTIONS, DAMAGE TO THE KEVLAR WRAPPING CAN OCCUR.
(7)
Close the fan cowl panel (AMM 71-11-04/201).
S 864-022
(8)
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P6 panel:
(a)
6B5, L GEN DRIVE DISC
(b)
6B6, R GEN DRIVE DISC
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S 724-023
(9) Do the IDG Operation Test, the Disconnect Test, and the Reset Test (AMM 24-11-00/501).
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AC GENERATION - DESCRIPTION AND OPERATION
_________________________________________
1. General (Fig. 1)_______
A. The ac generation system consists of two integrated drive generators (IDGs), one auxiliary power unit (APU) generator, and an external power source receptacle. All sources are rated to supply 115/200-volt, 3-phase, 400-Hz, 90-kva ac power. System control and protection is provided by units in the electrical/electronics equipment compartment.
B. Two IDGs, one mounted to the accessory gearbox of each engine, supply main power (Ref 24-11-00).
C. The APU generator is mounted to, and driven by, the APU. On the ground, the unit can supply ground service, ground handling, and/or main power. Inflight, the APU generator is a substitute power source for either IDG (Ref 24-21-00).
D. External power may be connected to supply ground service, ground
handling, and/or main power. (Ref 24-41-00).
E. The power system includes three generator control units (GCUs). One GCU controls each IDG. The third GCU controls the APU generator. The GCUs work with flight compartment switches to control breakers connecting power to the main ac, and ac tie buses (Ref 24-22-00).
F. The bus power control unit (BPCU) oversees system operation. Each GCU is connected to the BPCU through a serial data link. The BPCU sends commands and exchanges system status with the GCUs. The BPCU controls external power, ground service, and ground handling operation (Ref 24-41-00).
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