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the form of deicing/anti-icing fluid, must be provided. The period of effective anti-icing,
known as holdover time, must be longer than the period between deicing and take-off.
Holdover times start at the beginning of the final deicing procedure.
(5) If, during the conditions described in paragraph (4) above, take-off cannot be started
prior to the expiration of the holdover time, the airplane must again be inspected and
deiced, if necessary, before attempting take-off.
If ice, snow or frost is found on the airplane, accomplishing a one-step deicing/anti-icing
procedure will remove the contamination and provide limited anti-ice protection. When visible
precipitation continues to fall, extended anti-ice protection is required. In such cases, the
application of deicing/anti-icing fluids must be accomplished in two separate steps, which will
provide adequate protection in most environmental conditions. The characteristics of the
various deicing/anti-icing fluids used in carrying out these operations are described later in
this section.
C. Wet Aircraft and Temperatures Greater Than 0°C (32°F) but Less Than 5°C (41°F)
Consideration of the following should be made as to whether the aircraft should be
deiced/anti-iced:
(1) Conditions such as wind and forecast temperature. If temperatures are dropping, or are
forecasted to drop, treatment with Type I fluid should be considered.
(2) When an aircraft is wet due to light rain or mist, and the AFM icing definition of “visible
moisture” and “less than 5°C (41°F)” is satisfied. In such a situation, the AFM limitations
require the use of wing anti-ice for take-off.
(3) If the aircraft is wet because it has been cleaned with hot water, but there is no visible
moisture in the air, then the wing is at the same risk of being contaminated as if the
aircraft was taxiing in slush or pooled water on taxiways/runways. The use of wing
anti-ice is required for such conditions.
SUPPLEMENTARY PROCEDURES
Cold Weather Operations
Vol. 1 06−12−6
REV 66, Feb 01/07
CL−604 Operating Manual
PSP 604−6
4. AIRFRAME CONTAMINATION (CONT'D)
D. Clear Ice Due to Cold Fuel
Pilots must be aware of the effect that cold fuel in the tanks may have on moisture present on
the wing upper and lower surfaces. If fuel temperature is 0°C (32°F) or below, it is possible to
have clear ice on the wing with the temperature above freezing.
Pilots must ensure that the wing upper surface is free of clear ice by means of a tactile
(touch) check. Clear ice must be removed.
E. Frost Due to Cold Soaked Fuel
Wing frost, caused by cold soaked fuel, can form on the upper and lower surfaces of the wing
even at temperatures significantly above freezing. Frost on the upper surface of the wing
must be removed.
Take-off with the following accumulation of frost, due to cold soaked fuel, on the underside of
the wing fuel tank area is permissible:
• Maximum 3 mm (1/8 inch) layer of frost.
F. Frost on the Upper Surface of the Fuselage
Frost on the upper fuselage surface is not considered to be critical, if it is possible to
distinguish surface features (markings and lines). Frost in excess of this must be removed
from the fuselage.
5. PRE-FLIGHT PREPARATION
A. External Safety Inspection
The removal of contaminants from the airplane is a maintenance function: however, the flight
crew should be diligent during the pre-flight preparation to inspect areas where adherence
and accumulation of frost, ice, and snow could seriously affect normal systems operations.
(1) All protective covers ....................................... Removed • Probe covers (pitot and
static), TAT, ice detector,
AOA vane, and fuel NACA
vent covers.
• Wheel covers (nose and
main landing gear)
• Intake and exhaust covers
(engines, APU, ram air
scoop, and air-conditioning
packs).
(2) Pitot and static probes........................................... Clear and not obstructed.
(3) AOA vanes ............................................Free movement
(4) Windshield............................................................. Clear of ice and snow.
SUPPLEMENTARY PROCEDURES
Cold Weather Operations
Vol. 1 06−12−7
REV 66, Feb 01/07
▼
CL−604 Operating Manual
PSP 604−6
5. PRE-FLIGHT PREPARATION (CONT'D)
A. External Safety Inspection (Cont’d)
(5) Airplane surfaces................................................... Clear of frost, ice, snow and
dehydrated deicing/anti-icing
fluids.
NOTE
1. During snowfall, freezing rain and drifting snow, it is possible
　
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