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GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
ADVERSE WEATHER/ABNORMAL
ATMOSPHERIC CONDITIONS
APPENDIX E
E-50 FAA APPROVED
31 May 2001
When conditions exist where low-level windshear, microburst, or downburst may be present, the
pilot should consider diversion to an alternate airport or delay takeoff or landing until the risk of
an encounter is minimized. If the condition is unavoidable or unexpectedly encountered, you
may expect a rapid decay in airspeed and/or an increase in sink rate.
When the visual WS ALERT annunciator illuminates during takeoff, or the crew recognizes the
signs of increasing performance conditions, the following procedures should be followed:
1. The alert occurs during increasing performance conditions (i.e. increasing head
wind/decreasing tail wind and/or updraft.) The flight crew should be alerted to the
possibility of subsequent decreasing performance (i.e. significant airspeed loss and down
draft conditions.)
2. Throttles should be advanced to achieve maximum rated thrust and takeoff/go-around target
pitch attitude should be maintained until safe climb-out is assured, disengaging
autopilot/autothrottle if necessary.
When the visual WS ALERT annunciator illuminates during final approach, or the crew
recognizes the signs of increasing performance conditions, the following procedures should be
followed:
1. The alert occurs during increasing performance conditions (i.e. increasing head
wind/decreasing tail wind and/or updraft.) The flight crew should be alerted to the
possibility of subsequent significant airspeed loss and down draft conditions.
2. Wind and gust allowances should be added to the approach speed, increasing thrust if
necessary. It may be necessary to disengage autopilot/autothrottle.
3. Avoid sinking below the approach glidepath or letting the throttles remain at flight idle for
extended periods of time.
4. Coupled with other weather factors, the alert should be considered in determining the
advisability of performing a go-around.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
ADVERSE WEATHER/ABNORMAL
ATMOSPHERIC CONDITIONS
APPENDIX E
FAA APPROVED E-51
31 May 2001
When the siren and "WIND SHEAR--WIND SHEAR--WIND SHEAR" WARNING occurs and
the WS WARN annunciator is illuminated, or an obvious windshear condition is encountered,
the following procedures should be followed:
1. Disconnect the Autopilot and apply Go-Around Power.
2. Rotate at 3-4 degrees per seconds to increase pitch attitude to the highest possible value. (A
pitch attitude of 25 degrees has been demonstrated on the GIV at maximum landing weight
with flaps at 39 degrees.)
3. When stick shaker is encountered, or as VREF is approached, reduce pitch rate/angle of
attack to intercept VREF -20 KCAS.
4. Engine overboost should be avoided unless the airplane continues to descend and airplane
safety is in doubt. When airplane safety has been assured, adjust thrust to maintain engine
parameters within approved limits.
5. DO NOT retract flaps or landing gear until safe climb-out is assured.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
ADVERSE WEATHER/ABNORMAL
ATMOSPHERIC CONDITIONS
APPENDIX E
E-52 FAA APPROVED
31 May 2001
THIS PAGE LEFT BLANK INTENTIONALLY
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
ADVERSE WEATHER/ABNORMAL
ATMOSPHERIC CONDITIONS
APPENDIX E
FAA APPROVED E-53
31 May 2001
ABNORMAL ATMOSPHERIC CONDITIONS
INTRODUCTION
The following are recommendations and procedures for operations in conjunction with flight
through Abnormal Atmospheric Conditions that could, although highly unlikely, cause Dual
Engine Flame-Out. Possible scenarios are:
1. Volcanic Ash Encounter
2. Heavy Rain/Hail Encounter
3. Turbulence Penetration/Severe Gust Encounter
4. Bird Ingestion
5. Lightning Strike
NOTE: The following procedures recommend a glide speed of 300 KCAS not to exceed mach
limitation, down to 25,000 feet in order to attempt a relight. At 25,000 feet a smooth
transition to 210 KCAS should be made to minimize rate of descent.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
ADVERSE WEATHER/ABNORMAL
ATMOSPHERIC CONDITIONS
APPENDIX E
E-54 FAA APPROVED
31 May 2001
THIS PAGE LEFT BLANK INTENTIONALLY
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
ADVERSE WEATHER/ABNORMAL
ATMOSPHERIC CONDITIONS
APPENDIX E
FAA APPROVED E-55
11 October 2002
VOLCANIC ASH ENCOUNTER
Flight through volcanic ash should be avoided. If volcanic ash is encountered, reverse course to
clear the ash cloud and inform ATC. The Autothrottle should be disconnected. A low power
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