[1[1[iUBDlIU
II~
111.111
••••••
WING
HEAT
FAILURE
With
the
STAB WING HEAT switch
On,
a failure is indicated
by
the
WING
TEMP
indicator remaining in
the
red
(below
35°F
(1.
7"C))
range
and!
or
vi-
sual indications of ice accumulation.
Even
small 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.
1.
STAB & WING
HT
Circuit
Breaker
(copilot's main bus) - Check
and reset if necessary.
2.
Engine
RPM
- Adjust as required
to
maintain WING
TEMP
indica-
tor in
the
green range.
3.
If
WING
TEMP
indicator remains
in
the
red
range anel/or
visual
indications
of
ice accumulation remain,
fly
out
of
icing conditions.
4.
On
aircraft 35-067 thru 35-112 except 35-107 and 36-018 thru
36-031,
if
cabin altitude climbs
to
an
unacceptable level,
CABIN
AIR
Switch -
MAX.
Descend
to
an
acceptable level.
If
approach
and landing must
be
made
with any ice (or suspected ice during
night operations)
on
the
wing leading edge, refer
to
LANDINGS, this
section.
.
4-6
FAA
APPROVED
4-30-76.
REISSUED
2-25-81,
CHANGE
10
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