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Tailplane stall in a Gulfstream airplane has not been experienced but can occur in icing
conditions as the airplane is configured for landing. If tailplane stall does occur (identified by
pitch down), retract flaps to the previous position and raise nose to increase AOA while slowing
airspeed to minimum maneuvering speed for the current flap setting. After recovery, increase
power and return to previously assigned altitude.
Loss of roll control effectiveness is a different situation, and perhaps the more dangerous.
Because of flow disruption over the wing ahead of the ailerons, the controls do not produce the
rolling moments associated with a given deflection and airspeed. This can affect airplanes of any
size.
When reduction or loss of aileron control due to ice is experienced, it may or may not be
accompanied by abnormally light control forces. If the airplane is displaced in roll attitude, for
instance, caused by partial stall due to ice, the pilot’s efforts to correct the attitude by aileron
deflection are defeated by the lack of their effectiveness. To recover, lower pitch (decrease
AOA), increase airspeed, and roll wings level. After recovery, increase power and return to
previously assigned altitude.
INFLIGHT PROCEDURES
Engine Icing
Engine icing can occur without wing icing. A jet engine operating in an air mass with an
ambient temperature below 8°C may experience engine icing; this is caused by the temperature
drop associated with the reduction in pressure between that of the air mass and the pressure at the
first stages of the compressor. As air is drawn into the engine, moisture condenses into droplets.
These droplets, due to their inertia, cannot follow the air around the fan blades and guide vanes.
Instead, they strike the metal parts and freeze. This can happen in clear air if the temperature is
near or below freezing and the relative humidity is near saturation. The APU is also affected.
In icing conditions vibration levels may rise and fall as spontaneous shedding occurs.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
ADVERSE WEATHER/ABNORMAL
ATMOSPHERIC CONDITIONS
APPENDIX E
E-16 FAA APPROVED
GIV-SP 13 September 2000
To assist in shedding ice, should operational circumstances permit, one thrust lever at a time may
be quickly retarded to idle, held there for 5 seconds and then pushed momentarily to 85 per cent
LP. This will reduce the vibration indication and the thrust lever may be returned to its original
position.
WARNING: UNDER NO CIRCUMSTANCES WILL FLIGHTS BE PLANNED
THROUGH FORECAST OR KNOWN SEVERE ICING CONDITIONS. IF
FLIGHT THROUGH ICING CONDITIONS IS NECESSARY, THE
ENGINE AND WING ANTI-ICING SYSTEMS SHOULD BE TURNED ON
BEFORE ENTERING THE CONDITION. THESE ARE ANTI-ICING
SYSTEMS, AND THEY MUST BE USED BEFORE ICE BUILDUP
OCCURS. FLIGHT IN FREEZING RAIN OR FREEZING DRIZZLE
SHOULD BE AVOIDED.
Ice buildup on the cowling leading edge or nose cowl will have little effect on engine
performance unless more than 1/2 inch of ice is allowed to accumulate. These ice buildups
present a potential hazard as engine stall will occur and compressor damage may result when the
ice is ingested into the engine.
CAUTION: USE AIRSTART IGNITION WHILE ACTIVATING ENGINE ANTI-ICE
SWITCHES ONE AT A TIME SINCE ICE INGESTION MAY CAUSE
COMPRESSOR STALLS OR FLAMEOUT. TURN ON THE SECOND ENGINE
ANTI-ICE SWITCH ONLY AFTER ENGINE EPR, RPM, AND TGT HAVE
STABILIZED.
Pitot Icing
The airplane is equipped with a probe heating element for each pitot system. This system is
adequate to prevent pitot icing in moderate and severe icing conditions.
If any heating element malfunctions in the pilot’s, copilot’s or standby systems, immediate action
should be taken, when practical, to get out of icing conditions. All pitot-static instruments,
DADCs and flight data recorders will be affected by pitot icing. Failure of the pitot heat will be
evident to the crew by huge errors in the airspeed and altimeter indications.
NOTE: If DADC failure occurs due to pitot system icing, turn the stall barrier system off.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
ADVERSE WEATHER/ABNORMAL
ATMOSPHERIC CONDITIONS
APPENDIX E
FAA APPROVED E-17
13 September 2000 GIV-SP
AOA Probe Icing
The airplane is equipped with probe heaters for both AOA probes. The system is adequate to
prevent AOA icing in moderate and severe icing conditions. If any heater malfunctions, the stall
barrier protection systems will be affected. Select the Stall Barrier OFF and maintain minimum
maneuvering speeds or faster for the remainder of flight.
Windshield
The ON position of the windshield heat switches will provide satisfactory anti-icing and
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湾4飞机飞行手册AFM Gulfstream IV AIRPLANE FLIGHT MANUAL 2(61)
