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COLD
WEATHER
OPERATION
Operational problems related to cold weather may occur unless proper pre-
flight
and inspection procedures are accomplished. Additionally, operation-
al
difficulties due to ice, snow, slush or water accumulation may be
encountered. The following instructions supplement the normal procedures
and, when followed,
will
help ensure satisfactory operation of the aircraft
and its systems in cold climatic conditions.
PREFUGHT PREPARATION
It
is
essential to take
off
with
an
aerodynamically clean airplane. Low tem-
peratures and precipitation associated with cold weather operation create
problems while the airplane
is
on the ground,
in
that frost, ice and snow ad-
here to and accumulate on the surfaces of the airplane.
All
surfaces of the
airplane (wing, vertical and horizontal stabilizers,
fight controls, spoilers and
flaps)
must be free of frost, ice and snow before takeoff. During periods of
precipitation, once the airplane has been de-iced, anti-icing
is
likely to be
required
to
ensure that the airplane remains aerodynamically clean for de-
parture. De-icing/anti-icing must be accomplished at the last possible time
prior to takeoff to maximize the time that anti-icing
will
be
able
to
provide
protection (holdover time). Refer to Learjet Addendum - DE-ICING/
ANTI-
ICING
for de-icing/anti-icing procedures.
PREFUGHT INSPECTION
1. Conduct normal exterior inspection.
2.
Check the entire aircraft (including top surface of horizontal stabi-
lizer)
for ice, snow and frost. Brush off light snow. Remove
all
frost,
encrusted snow and ice.
3. Remove ice, snow and dirt from landing gear shock struts and
wheel wells. Check gear doors, position switches, squat switches,
wheels, brakes and tires.
4. Carefully inspect engines for frozen precipitation in fan duct and
tailpipe. Under certain climatic conditions, ice
can form
on
the back
of fan blades and cause vibration during start.
2-40
FAA
APPROVED
4-30-76
REISSUED
2-25-81,
CHANGE
lO
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