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autothrottle computer should be selected via the Display Controller and the autothrottle rearmed
on the Guidance Panel before reengaging.
An engine failure will result in autothrottle disengagement.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
PROCEDURES
FAA APPROVED 3-15
31 May 2000
3-03-30: AFGCS Failure:
The AFGCS incorporates monitors that ensure the safety of the system. These monitors provide
fail passive and fail operational capability of the system.
Fail Operational: If monitors detect a failure condition within a flight guidance computer the
failed computer will be shut down and control of the airplane will be
transferred to the remaining computer.
Fail Passive: If the airplane is being controlled by the second flight guidance computer,
after a single failure, and that computer fails, the autopilot will disengage.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
PROCEDURES
3-16 FAA APPROVED
31 May 2000
3-03-40: Mach Trim Compensation Failure:
If Mach Trim Compensation results in undesired elevator trim, and selecting the other flight
guidance computer does not correct condition, proceed as follows:
1. Pitch Trim Switch ............................................................................................... DISENGAGE
NOTE: Since electric elevator trim is not available, the manual trim wheel must be used.
2. Limit MMO to 0.75 MT
CAUTION: WHEN OBSERVING MMO OF 0.75 MT, CLOSELY MONITOR AIRSPEED TO
AVOID EXCEEDING 0.75 MT.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
PROCEDURES
FAA APPROVED 3-17
31 May 2000
3-03-50: Yaw Damper Failure:
The Yaw Damper is powered by the Flight Hydraulic System. If right engine has failed but is
windmilling, Flight System hydraulic pressure will remain at approximately 3000 psi and will
power the yaw damper. Should the right engine failure prevent windmilling, the yaw damper
should be selected OFF. The YAW DAMPER OFF message illuminates if the Yaw Damper is
OFF. With Yaw Damper inoperative maintain at least 220 KCAS above 18,000 ft. Maximum
fuel weight for takeoff with yaw damper inoperative is 9,000 lb (4,082 kg).
Below 18,000 ft. maintain airspeed, as function of fuel quantity, at or above that shown below
until ready to configure the airplane for approach and landing.
Fuel Quantity - 1000 lb 8 10 12 14 16 18 20 22 24 26 28 30
Minimum Airspeed - KCAS 96 107 117 126 135 143 151 158 165 172 178 184
When Yaw Damper failure is coupled with failure of Mach Trim Compensation, observe speed
limitations for both failures and limit altitude to 41,000 ft.
NOTE: If practical, land at fuel weight of less than 9,000 lb (4,082 kg). Landing at lower fuel
weights will improve dutch roll stability. Avoid flight into known areas of moderate or
greater turbulence.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
PROCEDURES
3-18 FAA APPROVED
31 May 2000
3-04-00: AUXILIARY POWER SYSTEM
3-04-10: APU Starting on External DC Power:
CAUTION: ENSURE AC EXTERNAL POWER IS DISCONNECTED.
1. Battery 1 and 2 Switches.....................................................................................................OFF
2. TRU Circuit Breaker (UNDER "AC RIGHT" ON PDB)................................................ PULL
3. DC External Power ................................................................................................. CONNECT
4. Electric Master Auxiliary Power ......................................................................................... ON
5. Battery Voltage ...................................................................................CHECK (Above 4 volts)
CAUTION: AIRPLANES WITHOUT ASC 54, THE BATTERIES MUST BE DEEP CYCLED
PRIOR TO FLIGHT IF BATTERY VOLTAGE IS BELOW 4 VOLTS. IF
BATTERY VOLTAGE IS BETWEEN 4 AND 20 VOLTS PRIOR TO APU
START, BATTERIES MUST BE DEEP CYCLED AT NEXT AVAILABLE
MAINTENANCE FACILITY.
CAUTION: AIRPLANES WITH ASC 54 AND BATTERY VOLTAGE BELOW 4 VOLTS,
THE BATTERIES MUST BE DEEP CYCLED AT NEXT AVAILABLE
MAINTENANCE FACILITY AFTER USE OF THIS PROCEDURE.
6. External DC ON Indicator Light.......................................................................................... ON
7. Battery Charger Circuit Breakers 1 and 2...................................................................CLOSED
8. HP Fuel Cocks .................................................................................................................SHUT
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
　
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