AIRPLANE
OPERATIONS
MANUAL
SUPPLEMENTARY
P
ROCEDURES
ENVIRONMENTAL
REVISION 41
1-02-79
Page
1
Code
01
Copyright © by Embraer. Refer to cover page for details.
OPERATION IN ICING CONDITIONS
This Section contains amplified procedures to Operation in Icing
Conditions, Cold Weather Operation and Cold Soak Operation that
supplement those procedures published in the AFM. In case of
disagree, the AFM shall prevail.
EXTERNAL SAFETY INSPECTION
Operating regulations clearly state that no takeoff is allowed when
snow, ice or frost is adhering to the airplane.
The responsibility for ensuring a clean airplane rests with the flight
crew. The primary method for the flight crew to ensure a clean airplane
is through close visual and physical inspection of the critical surfaces
prior to takeoff. Visually check the wing, control surfaces, engines and
fuselage prior to takeoff. In addition, as no frozen contamination is
allowed on the wing upper surface, carry out a physical (hands-on)
inspection to ensure that there is no ice accretion. Do not touch the
surfaces with bare hands, as the skin may stick to a freezing surface.
Even at intermediate stops, an external walk around is necessary due
to the possibility of ice forming after landing from either cold soaking
frost, conventional frost or precipitation freezing on the airplane.
During the pre-flight walk-around, ensure that the pitot tubes, static
ports, TAT probe, AOA vanes, all inlets, outlets and vents are clear of
ice and unobstructed.
A 3 mm (1/8 in) frost layer is permitted on the underwing surfaces.
Frost is not permitted on the lower or upper surface of the horizontal
stabilizer or the upper surface of the wing.
If the airplane has become cold soaked as a result of flight at very cold
temperatures, fuel might be at a subfreezing temperature. This can
cause ice accretion if the airplane is subjected to high humidity, fog,
drizzle or rain even when the outside air temperature is substantially
above freezing.
At the completion of the walk-around, if ice, snow or frost is
discovered, de-icing, and possibly anti-icing will be required. The
check for ice accumulation should be done in a well-lit area.
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