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g. Essential AC Bus AUTO Switch Light.....................................................PUSH
NOTE: If Pilot’s Phase A is not the fault, reset pressurization to AUTO.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
PROCEDURES
FAA APPROVED 3-57
31 May 2000
3. If light remains on:
A. Verify power is available on LEFT MAIN AC BUS.
B. Essential AC Bus L Main Switch Light ......................................................................PUSH
C. AC RESET Switch Light ............................................................................................PUSH
If AC RESET Switch Light extinguishes, monitor voltage and frequency for remainder of
flight.
If AC RESET Switch Light does NOT extinguish:
D. Verify power is available on RIGHT MAIN AC BUS.
E. Essential AC Bus R Main Switch Light......................................................................PUSH
F. AC RESET Switch Light ............................................................................................PUSH
If AC RESET Switch Light extinguishes, monitor voltage and frequency for remainder of
flight.
If AC RESET Switch Light does NOT extinguish, continue Checklist.
G. Essential AC Bus E INV Switch ..............................................................................PUSH
H. Monitor voltage and frequency for remainder of flight.
NOTE: All B and C Phase Essential AC Bus power is not available.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
PROCEDURES
3-58 FAA APPROVED
31 May 2000
MAIN AC BUS FAULT INDICATED
NOTE: With a MAIN AC BUS unpowered, the corresponding CHGR FAIL Warning Light will
illuminate.
If LEFT MAIN AC BUS is unpowered,
1. Essential AC BUS RIGHT MAIN Switch Light ............................................................ PUSH
NOTE: If RIGHT MAIN AC BUS is unpowered, leave Essential AC Bus In AUTO.
2. AC RESET Light .............................................................................................................PUSH
3. If RESET Light extinguishes and power is restored to the bus:
A. If fault indication was the LEFT BUS, Essential AC Bus Auto Switch Light.........PUSH
B. Monitor loads for remainder of flight.
4. If RESET Light extinguishes momentarily, while bus cycles through available sources, then
re-illuminates:
A. Relevant AC Main Feeder Circuit Breakers (PDB) ................................................. PULL
B. AC RESET Switch Light .........................................................................................PUSH
C. RESET Main Feeder circuit breakers one at a time. Allow sufficient time for fault to
recur.
D. After fault isolation, leave applicable circuit breaker pulled (OPEN).
E. AC RESET Switch Light .........................................................................................PUSH
F. If fault was the LEFT BUS, Essential AC Bus AUTO Switch Light......................PUSH
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
PROCEDURES
FAA APPROVED 3-59
31 May 2000
5. If RESET Light remains ON:
A. Verify availability of power for failed bus by selecting Volt/Freq. Meter to LEFT,
RIGHT, and, if APU is running, AUX.
B. If failed bus is LEFT AC BUS, then:
As available, LEFT MAIN, RIGHT MAIN, or AUX ..............................................PUSH
C. If failed bus is RIGHT AC BUS, then:
As available, RIGHT MAIN, LEFT MAIN, or AUX ..............................................PUSH
D. AC RESET Switch Light .........................................................................................PUSH
E. If RESET Switch Light extinguishes, monitor loads for remainder of flight.
F. If RESET Switch Light remains ON, note loss of equipment powered by dead bus.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
PROCEDURES
3-60 FAA APPROVED
31 May 2000
MAIN DC BUS FAULT INDICATED
1. If the LEFT MAIN DC BUS is unpowered: Essential DC BUS RIGHT Switch Light ..........
.......................................................................................................................................PUSH
NOTE: If RIGHT MAIN DC BUS is unpowered, leave Essential DC Bus in AUTO.
2. DC RESET Light ............................................................................................................PUSH
3. If RESET light extinguishes and power is restored to the bus:
A. If fault indication was LEFT BUS, Essential DC Bus AUTO Switch Light............PUSH
B. Monitor loads for remainder of flight.
4. If RESET Light extinguishes momentarily, while the bus cycles through available sources,
　
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