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direction. All these conditions cause unwanted run-down of the protective film. If
these conditions accumulate, the time of protection can be shortened
considerably.
CAUTION
DO NOT SPRAY DE-ICING FLUID IN AREAS WHERE
SPRAYOR FLUID MAY ENTER THE ENGINE ORAPU
AIR INLETS. DE-ICING FLUID MAY BE USED TO
CLEAR THESE AREAS PROVIDING IT IS
THOROUGHLY WIPED CLEAN BEFORE STARTING.
CAUTION
IF A DE-ICING SOLUTION IS INADVERTENTLY
SPRAYED INTO THE ENGINE OR APU INLETS OR
CONTACTS THE EXHAUST WHEN THE ENGINES
ORAPUARE OPERATING,APOTENTIALLYUNSAFE
CONDITION COULD DEVELOP IN THE CABIN.
ENGINE BLEEDS SHOULD BE OFF AND DOORS
AND OUTFLOW VALVE CLOSED DURING DE-ICING
OPERATIONS TO MINIMIZE THE RISK OF CABIN
ENVIRONMENT CONTAMINATION. IT IS RECOMMENDED
APU NOT BE RUNNING AND INLET DOOR
BE CLOSED DURING DE-ICING OPERATIONS.
3. De-Icing Procedure:
A. Horizontal Stabilizer/Elevator:
Remove any ice or snow contamination from the leading edge of the
stabilizer. Remove all accumulations from the upper surface of the
stabilizer and elevator. If using the spray method, ensure that runoff of
fluids are away from the elevator balance bay. This prevents melted snow/
ice from accumulating in this area and refreezing in flight.
B. Vertical Stabilizer/Rudder:
The leading edge of the vertical stabilizer, as well as the side panels and
rudder, should be cleaned of any snow/ice accumulation. The gap between
rudder and stabilizer should also be free of snow/ice accumulation.
C. Fuselage:
Remove snow top-to-bottom. Avoid spraying heated fluids directly on cabin
and cockpit windows. Ensure that the radome area is clean. If using
mechanical means, special care should be taken to avoid damage to
antennas. Remove any fluid runoff from cockpit windows and radome prior
to departure. Avoid spraying directly on pitot tubes, static ports, and Angle-
OPERATING MANUAL
07-01-00 ALL WEATHER OPERATIONS AND PROCEDURES
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October 11/02
Revision 8
of-Attack (AOA) probes. Do not spray into APU inlets, engine inlets or ram
air inlets.
CAUTION
IF APU/ENGINES ARE RUNNING WHEN SPRAYING
OF DE-ICING FLUIDS IS IN PROGRESS, TURN
BLEED AIR OFFAND CLOSE OUTFLOW VALVEAND
DOORS.
D. Wing:
Clean wing from wing tip to wing root. If using the spray method, ensure
that runoff is away from aileron balance bay area to prevent accumulation
of melted snow/ice in this area. Ensure that leading edge is free of ice. The
PIC should conduct a hands-on inspection to verify leading edge, upper
and lower wing surfaces are clean.
E. Engine:
Snow/ice removal from the engine inlet should be accomplished using
mechanical means. Any frozen deposits that may be bonded to inlet /
intake surfaces or fan blades must be removed by hot air. Do not spray
de-icing fluid directly into the engine core.
The LP fan must be verified to be free to rotate. If not, the engine must be
pre-conditioned prior to start.
CAUTION
DO NOT USE DE-ICING FLUID. AFTER DE-ICING
ENGINE, START ENGINE(S) IMMEDIATELY TO
PREVENT ANY RE-ICING CONDITION. SELECT
ENGINE ANTI-ICE ON AFTER ENGINE IS STARTED.
F. Landing Gear:
Tires, wheels, brakes, struts, side braces and uplocks should be free of
snow / ice.
CAUTION
DONOTUSEDE-ICING FLUIDONTHE BRAKESAND
/ OR WHEELS.
G. Doors:
Main door and baggage compartment door seals, hinges and tracks should
be free of snow/ice. Ensure proper operation to prevent refreezing in flight.
4. Anti-Icing:
If desired, apply ground anti-icing process immediately after the airplane is
deiced. This involves applying a mixture of SAE or ISO Type II and water to critical
surfaces of the airplane. This step may increase holdover time(s) between antiicing
and estimated departure time.
Any time the recommended holdover time is exceeded, a pre-takeoff inspection is
required. Refer to the holdover time(s) tables for Type I/Type II Fluids.
OPERATING MANUAL
ALL WEATHER OPERATIONS AND PROCEDURES 07-01-00
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October 11/02
Revision 8
5. Preflight De-Icing Inspection Checklist:
NOTE:
Perform preflight de-icing inspection checklist
IMMEDIATELY following ground de-icing or during
anti-icing process.
The following items should be free of snow, ice and/or frost accumulation:
• Wing Leading Edges (“Hands On”)
• Wing Upper and Lower Surfaces (“Hands On”)
• Wing Trailing Edges (“Hands On”)
• Areas Around Flight Control Actuators and Push Rods (“Hands On”)
• Vertical and Horizontal Stabilizers Including Leading Edges, Side Panels,
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湾流4操作手册 Gulfstream IV Operating Manual 3(142)
