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edges and forward upper wing surface may adversely change the stall
speeds, stall characteristics and the protection provided by the stall
protection system, which may result in loss of control on take-off.
Take-off is prohibited with frost, ice, snow or slush adhering to any critical surface (wings,
horizontal stabilizer, vertical stabilizer, control surfaces, engine inlets and upper surface of the
fuselage) except that take-off is permitted with frost adhering to:
• the upper surface of the fuselage; and/or
• the underside of the wing, that is caused by cold soaked fuel,
in accordance with the instructions provided in Chapter 6; SUPPLEMENTARY PROCEDURES –
COLD WEATHER OPERATION – PRE-FLIGHT PREPARATION – External Safety Inspection.
NOTE
Comprehensive procedures for operating in cold weather are provided
in Chapter 6; SUPPLEMENTARY PROCEDURES – COLD WEATHER
OPERATION.
In addition to a visual check, a tactile check of the wing leading edge, wing forward upper surface
and wing rear upper surface is required during the External Walkaround inspection to determine
that the wing is free from frost, ice, snow or slush when:
• the outside air temperature (OAT) is 5°C (41°F) or less, or
• the wing fuel temperature is 0°C (32°F) or less; or
• the atmospheric conditions have been conducive to frost formation.
NOTE
Ice and frost may continue to adhere to wing surfaces for some time
even at outside air temperatures above 5°C (41°F).
LIMITATIONS
Operating Limitations
Vol. 1 02−04−3
REV 77, Oct 20/09
CL−604 Operating Manual
PSP 604−6
4. OPERATION IN ICING CONDITIONS
During cold weather operations, the flight crew must ensure that the airplane fuselage, wings and
tail surfaces are free from ice, snow or frost.
AR Certified Airplanes
WARNING
Even small accumulations of ice on the wing leading edge can
change the stall speed, stall characteristics or the warning margin
provided by the stall protection computer.
A. Cowl Anti-ice System
(1) Ground Operations
The engine cowl anti-ice system must be on when the OAT is 10°C (50°F) or below and
visible moisture in any form is present (such as fog with visibility of one mile or less, rain,
snow, sleet and ice crystals).
The engine cowl anti-ice system must also be on when the OAT is 10°C (50°F) or below
when operating on runways, ramps, or taxiways where surface snow, ice, standing water
or slush is present.
(2) Flight Operations
NOTE
Icing conditions exist in flight at a TAT of 10°C (50°F) or below and
visible moisture in any form is encountered (such as clouds, rain, snow,
sleet or ice crystals), except when the SAT is –40°C (–40°F) or below.
The engine cowl anti-ice system must be on:
At or above 22,000 feet:
• when ice is indicated by the ice detection system, or
• when in icing conditions, if an ice detector has failed.
Below 22,000 feet:
• when in icing conditions, or
• when ice is indicated by the ice detection system.
LIMITATIONS
Operating Limitations
Vol. 1 02−04−4
REV 77, Oct 20/09
CL−604 Operating Manual
PSP 604−6
4. OPERATION IN ICING CONDITIONS (CONT'D)
B. Wing Anti-ice System
(1) Ground Operations
NOTE
Icing conditions exist on the ground when the OAT is 5°C (41°F) or
below and:
1. visible moisture in any form (such as clouds, fog or mist) is present
below 400 feet AGL, or
2. the runway is wet or contaminated, or
3. in the presence of any precipitation (such as rain, snow, sleet or ice
crystals).
The wing anti-ice system must be selected ON, for final taxi prior to take-off, if the OAT is
5°C (41°F) or below, unless Type II, III or IV anti-icing fluids have been applied. Single
engine taxi operations are prohibited in these conditions.
NOTE
1. L (R) WING A/ICE caution messages may be posted or L HEAT or
R HEAT lights may go out during taxi but caution messages must be
verified out and WING A/ICE ON or WING/COWL A/ICE ON advisory
message and L HEAT and R HEAT lights must be verified on, prior
to take-off. If wing anti-ice is not required for take-off it should be
selected OFF just prior to take-off.
2. To prevent wing contamination from reverse jet blast, operating the
thrust reversers during taxi operations on wet and contaminated
surfaces should be avoided.
The wing anti-ice system must be selected and confirmed ON for take-off, when the OAT
is 5°C (41°F) or below and:
　
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