(b)  
An EICAS message appears if either the captain's or first officer's transfer bus switches to its alternate power source while its main source still has power: CAPT INSTR XFER or F/O INSTR XFER.

 (c)  
AIRPLANES WITH HYDRAULIC MOTOR GENERATOR; If power is lost to both main ac buses the hydraulic motor-driven generator system will supply power to the captain's instrument transfer bus via the 115v ac instrument transfer relay.

 (7)  
AC Transfer Bus (Fig. 10)

 (a)  AIRPLANES WITH HYDRAULIC MOTOR GENERATOR; The left and right AC Transfer Buses are powered by the Hydraulic Motor Generator (HMG) through the left and right ac transfer bus relays respectively if power is lost to both main ac buses during flight.
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MAINTENANCE MANUAL

H12304
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MAINTENANCE MANUAL

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MAINTENANCE MANUAL

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757 FAULT ISOLATION/MAINT MANUAL
115-VOLT AC POWER DISTRIBUTION

FIG.
102
COMPONENT
QTY
ACCESS/AREA
REFERENCE
SHT
CIRCUIT BREAKERS
FLT COMPT, P6
.A CAPT PRIM INSTR BUS, C4264
1
6M16
*
.B CAPT PRIM INSTR BUS, C4265
1
6M17
*
.C CAPT PRIM INSTR BUS, C4266
1
6M18
*
.A F/O PRIM INSTR BUS, C4267
1
6M22
*
.B F/O PRIM INSTR BUS, C4268
1
6M23
*
.C F/O PRIM INSTR BUS, C4269
1
6M24
*
AC STBY BUS PWR, C874
1
6K16
*
CENTER BUS AC, C876
1
6K17
*
28V AC BUS L, C877
1
6K18
*
28V AC BUS R, C878
1
6K24
*
115V AC BUS L SEC 1, C313
1
6C14
*
115V AC BUS L SEC 2, C308
1
6A17
*
115V AC BUS L SEC 3, C310
1
6A14
*
115V AC BUS R SEC 1, C319
1
6C20
*
115V AC BUS R SEC 2, C307
1
6A23
*
115V AC BUS R SEC 3, C317
1
6A20
*
CIRCUIT BREAKERS
FLT COMPT, P11
LIGHTING CAPT INSTR ALT BUS A, C4227
1
11Q34
*
LIGHTING CAPT INSTR ALT BUS B, C4229
1
11Q35
*
LIGHTING CAPT INSTR ALT BUS C, C4231
1
11Q36
*
LIGHTING F/O INSTR ALT BUS A, C4266
1
11Q7
*
LIGHTING F/O INSTR ALT BUS B, C4228
1
11Q8
*
LIGHTING F/O INSTR ALT BUS C, C4230
1
11W9
*
LIGHTING CAPT INSTR XFR CONT, C4225
1
11Q33
*
LIGHTING F/O INST XFR CONT, C4224
1
11Q6
*
MISC SYS CAT III BUS ISOL L, C824
1
11R3
*
MISC SYS CAT III BUS ISOL R, C825
1
11R30
*
MISC SYS UTIL BUS L, C822
1
11R4
*
MISC SYS UTIL BUS R, C823
1
11R31
　
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