111.111
••••••
INADVERTENT
ICING
ENCOUNTER
- U
idng
is
inadvertently
encountered:
1.
All
Anti-Ice Systems - Activate immediately to preclude ice accu-
mulation.
If
approach and landing
must
be made with any amount
of
ice
on
the airframe:
a. Do not extend flaps beyond 20°.
h.
Use landing procedure for a wing and stabilizer heat failure.
Refer to
lANDINGS, this section.
Even
smaD accumulations of ice
on
the wing leading
edge
can cause aerodynamiC stall prior to activation of
the
stick
shaker
and/or
pusher. These ice accumulations
can cause angle-of-attack indicator infonnation to
be
unreliable.
Ice
accumulation on the stabilizer may cause deteriora-
tion
in
trim speeds and changes in handling characteris-
tics.
Low
speed
flight
should be approached with care
so
that detection of abnormal
flying
qualities can be ob-
tained.
It
may be necessary to land with
flaps
at 20° as
some buffet
and/or
some nose pitch may
be
encoun-
tered with
the
flaps
full
down.
- If
heavy
ice
accumulation
has
occurred,
proceed
as
follows:
If
en
route
and
destination temperatures
remain
below freezing,
consideration should
be
given
to
landing
with
ice
on
the wings.
-If
landing with ice on the wings and stabilizer:
1. Use landing procedure for a wing and stabilizer heat
failure.
Refer
to
LANDINGS,
this section.
-If
attempting to remove ice accumulation:
1.
AIR
IGN
Switches - On.
2. Engine
RPM
- Set as low as possible to maintain anti-icing heat
and cabin pressure.
3. NAC
HEAT
Switch (for one engine) - On; wait
until
satisfactory
engine operation
is
apparent, then opposite engine
NAC
HEAT
Switch - On; observe Turbine Temperature (1TIl rise and ENG
ICE
light out for operation of engine anti-ice.
4. After satisfactory engine operation
is
apparent,
STAB
WING
HEAT
Switch-On.
5. After satisfactory engine operation
is
again apparent, energize
remaining anti-ice systems, one system at a time, waiting for satis-
factory engine operation between energizing each system.
FAA APPROVED 4-30-76
REISSUED
2-25-81,
CHANGE
10
4-3
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