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turbulence. Airplane pitch motions and ride qualities are aggravated when the Flight Director
vertical modes are engaged during these flight conditions.
ENGINES
When encountering SEVERE gust turbulence, rapid power adjustments should be avoided. The
Autothrottle should be OFF and Airstart Ignition ON. If both engines flameout, an immediate
relight is recommended.
As RPM is decreasing, perform the following procedures immediately:
1. Power Levers..................................................................................................................... IDLE
2. Airstart Ignition.................................................................................................................... ON
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
ADVERSE WEATHER/ABNORMAL
ATMOSPHERIC CONDITIONS
APPENDIX E
E-58 FAA APPROVED
11 October 2002
3. Altitude/Airspeed............................... Descend at 270 KCAS/0.75 MT until out of turbulence,
then descend at VMO/MMO to 25,000 ft.
NOTE: Use of Speed brakes is not recommended. Use of the Standby Electrical System
(ABEX) Generator is not possible with a windmilling engine.
CAUTION: MANEUVERS SHOULD BE LIMITED TO MINIMUM BANK AND PITCH
ANGLES SINCE HYDRAULIC BOOST WILL BE LOST IF ENGINE RPM
DECAYS.
CAUTION: FOR AIRPLANES SN 1000 THRU 1249 WITHOUT ASC 304: THE DUTY
CYCLE TIME FOR CONTINUOUS (AIRSTART) IGNITION WITHOUT ASC
304 IS FIVE (5) MINUTES ON AND THIRTY (30) MINUTES OFF FOR
COOLING THERE IS NO LIMITATION ON THE IGNITION WHEN USED IN
A THIRTY (30) SECONDS ON, THIRTY (30) SECONDS OFF CYCLE.
FOR AIRPLANES SN 1250 AND SUBS AND SN 1000 THRU 1249 WITH
ASC 304: THERE IS NO DUTY CYCLE TIME LIMITATION FOR
CONTINUOUS (AIRSTART) IGNITION WITH ASC 304.
CAUTION: ENGINE DAMAGE MAY RESULT IF RPM IS NOT ALLOWED TO
STABILIZE AT IDLE BEFORE ADVANCING POWER LEVERS.
If engine(s) DO NOT relight, continue descent to the Airstart envelope (Sea Level to 25,000 ft.
and 200 KCAS to 324 KCAS). Proceed toward the nearest suitable landing site.
Refer to Dual Engine Flameout Procedure, EMERGENCY PROCEDURES, Section 4.
AIRSPEED
1. Recommended Turbulence Penetration Airspeed is 270 KCAS/0.75 MT, whichever is lower.
2. A minimum speed of 1.5 Vs is recommended to maintain adequate buffet margins.
3. Severe turbulence will cause large and often rapid variations in indicated airspeed.
DO NOT CHASE AIRSPEED.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
ADVERSE WEATHER/ABNORMAL
ATMOSPHERIC CONDITIONS
APPENDIX E
FAA APPROVED E-59
31 May 2001
ATTITUDE
1. Maintain the desired pitch attitude and keep wings level.
2. Large and sudden control and power changes should be avoided.
PASSENGER WARNING
1. SEAT BELT......................................................................................................................... ON
AUTOPILOT
If Autopilot On
1. Use of the basic autopilot Attitude and Heading hold modes is recommended.
2. Avoid use of Flight Director vertical modes.
3. Pilot inputs should be made through the turn and pitch controller, if installed.
4. Avoid using Touch Control Steering in severe turbulence.
5. Severe conditions may cause the autopilot to disengage.
If Autopilot Off Or Disengaged
1. Hand flying the airplane again requires basic attitude control.
2. Pitch and roll attitudes may best be controlled with the control yoke only.
3. Use of rudder is not recommended and may actually aggravate the situation.
YAW DAMPER
1. The Yaw Damper should be engaged at all times. DO NOT FLY INTO AREAS OF
KNOWN SEVERE TURBULENCE WITH A FAILED YAW DAMPER.
If in turbulence with Yaw Damper off, avoid chasing airplane motion with rudder. Attempt to
hold rudder pedals stationary and wings level.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
ADVERSE WEATHER/ABNORMAL
ATMOSPHERIC CONDITIONS
APPENDIX E
E-60 FAA APPROVED
31 May 2001
BIRD INGESTION
If both engines flameout, an immediate relight is recommended. As RPM is decreasing, perform
the following procedures immediately:
1. Power Levers..................................................................................................................... IDLE
2. Airstart Ignition.................................................................................................................... ON
3. Altitude/Airspeed...................................................................................Descend at 210 KCAS
If at low altitude and unable to achieve immediate relight:
Prepare for Dual Engine Out Landing Procedure. Refer to EMERGENCY PROCEDURES
Section 4.
NOTE: Use of Speed brakes is not recommended. Use of the Standby Electrical System
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湾4飞机飞行手册AFM Gulfstream IV AIRPLANE FLIGHT MANUAL 2(164)
