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GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
PROCEDURES
FAA APPROVED 3-53
31 May 2000
ESSENTIAL DC BUS FAULT INDICATED
1. DC RESET Switch Light.................................................................................................PUSH
If light extinguishes and remains out:
A. Essential DC Bus AUTO Switch Light..........................................................CHECK ON
B. Verify electrical power is on L MAIN DC bus (source light illuminated) and Essential
DC L MAIN Switch Light is ON.
C. Monitor voltage for remainder of flight.
2. If light extinguishes momentarily while the bus cycles through possible power sources, then
re-illuminates:
A. Essential DC Bus Batt Switch..................................................................................PUSH
B. Essential DC bus feeder circuit breakers (located on PDB)............. PULL (one at a time)
C. DC RESET Switch Light ............................PUSH (once, for each circuit breaker pulled)
CAUTION: PULL ONLY ONE (1) CIRCUIT BREAKER AT A TIME AND, IF
PROBLEM CONTINUES, RESET CB BEFORE PULLING THE NEXT
CIRCUIT BREAKER.
D. After fault isolation, leave applicable feeder breaker pulled (OPEN).
E. Essential DC Bus AUTO Switch Light..........................................................CHECK ON
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
PROCEDURES
3-54 FAA APPROVED
31 May 2000
3. If light remains illuminated:
A. Essential DC Bus Battery Switch Light ...................................................................PUSH
B. Battery Amperage..................................................................................................CHECK
If the Main DC buses are powered, turn off both Main Boost Pumps. If Main DC busses are
not powered, open Crossflow and turn off Right Main Boost Pump.
If battery amperage exceeds negative three (-3) amps discharge, consideration should be
given to descending below 15,000 ft. and turning off all boost pumps to conserve battery
life.
ESSENTIAL AC BUS FAULT INDICATED
1. AC RESET Switch Light.................................................................................................PUSH
If light extinguishes and remains out:
A. Essential AC Bus AUTO Switch Light..........................................................CHECK ON
B. Verify electrical power is on L MAIN AC BUS (source light illuminated) and that
Essential AC L MAIN Switch Light is ON.
C. Monitor voltage and frequency for remainder of flight.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
PROCEDURES
FAA APPROVED 3-55
31 May 2000
2. If light extinguishes momentarily while the bus cycles through possible power sources, then
re-illuminates:
A. Essential AC Bus AUTO Switch Light..........................................................CHECK ON
B. Check Essential AC bus voltage and frequency.
1. If indications are normal:
a. Pilot’s/Copilot’s Phases B and C circuit breakers ("AC ESS"
Section on Power Distribution Box (PDB)).............................................. PULL
b. AC RESET Switch Light ..........................................................................PUSH
c. RESET Pilot’s and Copilot’s Phases B and C circuit breakers one at a time.
Allow sufficient time for fault to reoccur. AC RESET switch light will
illuminate.
d. After fault isolation, leave applicable circuit breaker pulled (OPEN).
e. AC RESET Switch Light ..........................................................................PUSH
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
PROCEDURES
3-56 FAA APPROVED
31 May 2000
2. If indications are abnormal (voltage and frequency drop):
a. Essential AC Bus E INV Switch ..............................................................PUSH
b. Pilot’s/Copilot’s Phase A and ACCESS circuit breakers
(AC ESS Section on Power Distribution Box (PDB) ............................... PULL
c. Manual Pressurization ...........................................................................SELECT
CAUTION: PULLING PILOT’S PHASE A CIRCUIT BREAKER CAUSES
LOSS OF AUTOMATIC PRESSURIZATION CONTROL; ONLY
MANUAL PRESSURIZATION WILL BE AVAILABLE.
d. AC RESET Switch Light ..........................................................................PUSH
e. Reset Pilot’s and Copilot’s Phase A and ACCESS circuit breakers one at time.
Allow sufficient time for fault to reoccur.
f. After fault isolation, leave applicable circuit breaker pulled (OPEN).
　
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