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2) 11R3, CAT III BUS ISOL LEFT
3) 11R30, CAT III BUS ISOL RIGHT (bd) Close the CENTER BUS AC circuit breaker (6K17 or 31EG3). (be) Close the CENTER BUS PWR circuit breaker (6C09) on the P6
panel.
G. Test Autoland DC Tie
S 725-052
(1) Do a check of the autoland dc tie:
(a)
Remove the electrical power from the main ac buses.
(b)
Push the BAT switch on the P5 panel, to the OFF position.
(c)
Attach a DO-NOT-OPERATE tag on the BAT switch (P5).
WARNING: DO NOT OPEN THE MAIN POWER DISTRIBUTION PANEL (P6) WITH
_______ POWER ON THE AIRPLANE. HIGH VOLTAGE IN THE PANEL CAN CAUSE INJURY.
(d)
Open the main power distribution panel P6.
(e)
Remove the isolation request relay, K122 from the P6 panel. 1) Keep the isolation request relay for the installation.
(f)
Install the adapter, for the isolation request relay, in the K122 location in the P6 panel. 1) Set the switch on the relay adapter to the ON position.
(g)
Close the P6 panel.
(h)
Remove the DO-NOT-OPERATE tag from the BAT switch (P5).
(i)
Make sure these circuit breakers on the P11 panel are closed: 1) 11D6, CAT III BUS ISOL BAT 2) 11Q6, F/O INST TRANSFER CONT 3) 11Q7, F/O INST TRANSFER ALTN BUS oA 4) 11Q8, F/O INST TRANSFER ALTN BUS oB 5) 11Q9, F/O INST TRANSFER ALTN BUS oC 6) 11Q33, CAPT INST TRANSFER CONT 7) 11Q34, CAPT INST TRANSFER ALTN BUS oA 8) 11Q35, CAPT INST TRANSFER ALTN BUS oB 9) 11Q36, CAPT INST TRANSFER ALTN BUS oC
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10) 11R3, CAT III BUS ISOL LEFT
11) 11R30, CAT III BUS ISOL RIGHT
(j)
Make sure these circuit breakers on the P6 panel are closed: 1) 6M16, CAPT PRIM INST BUS oA 2) 6M17, CAPT PRIM INST BUS oB 3) 6M18, CAPT PRIM INST BUS oC 4) 6M22, F/O PRIM INST BUS oA 5) 6M23, F/O PRIM INST BUS oB 6) 6M24, F/O PRIM INST BUS oC
(k)
Make sure these circuit breakers are closed:
1) 6A17 or 31EC02, 115V AC BUS LEFT SEC 2
2) 6A23 or 32EB02, 115V AC BUS RIGHT SEC 2
S 865-053
(2)
Supply external power to the left main ac bus (Ref 24-22-00).
S 865-054
(3)
Supply IDG power to the right main ac bus (Ref 24-22-00).
S 725-055
(4)
Do these steps:
CAUTION: MAKE SURE THE YELLOW DRIVE LIGHT IN THE GEN DRIVE DISC
_______ SWITCH STAYS OFF WHILE THE ENGINE OPERATES. IF THE DRIVE LIGHT COMES ON WHILE THE ENGINE OPERATES, PUSH THE GEN DRIVE DISC SWITCH (P5). IF YOU OPERATE THE GENERATOR WITH THE LIGHT ON, THE GENERATOR CAN BE DAMAGED.
(a) Make sure the DRIVE light in the R GEN DRIVE DISC switch (P5) is off, when the engine operates. 1) Push the GEN DRIVE DISC switch if the yellow DRIVE light
comes on. 2) Stop the engine (Ref 71-00-00). 3) Isolate the problem which caused the DRIVE light to come
on.
(b)
Make sure the two BUS TIE switches (P5), are set to the AUTO position. 1) Make sure the ISLN light in each switch is off.
(c)
Make sure the EICAS system operates (Ref 31-41-00).
(d)
Push the STATUS switch on the EICAS select panel located on the forward control stand P9.
(e)
Make sure the TR UNIT, CAPT INSTR XFER, and F/O INSTR XFER messages are not displayed on the lower EICAS display unit.
(f)
Open this circuit breaker:
1) 6M16, CAPT PRIM INSTR BUS oA
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MAINTENANCE MANUAL
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