[1rnill[BDrnlr
Imm
llilill
.anual
ICE
DETECTION
Identification
of
ice on aircraft surfaces can be accomplished
by
the
follow-
ing
methods:
1.
Ice
formation on the lower corners
of
the windshield or nose of the
tip tank.
2. During night
flights,
two red ice detect lights
will
cause red areas
approximately
1-1/2
inches (38.1
mm)
in
diameter to appear on
the windshield when particles of ice or moisture adhere to the
wind-
shield. The light on the pilot's side
is
located
in
the defog airstream
and the copilot's light
is
located outside the defog airstream; there-
fore, the copilot must monitor the light
on
his
side when the wind-
shield heat
or
alcohol de-ice systems are operating. The windshield
ice detect lights
will
indicate
ice
encounters when
OAT
is
below
freezing and moisture encounters when
OAT
is above freezing.
Refer to figure
in
Section V entitled
RAM
AIR
- OUTSIDE
AIR
TEMPERATURE CONVERSION
for
RAT
to
OAT
conversion.
3. Wing and horizontal stabilizer temperature conditions where icing
may occur can be identified through the use
of
the
WING
TEMP
and
STAB
TEMP indicators. When the indicator pOinter
is
in
the
green arc, the wing or stabilizer structure
is
above 35°F (1. 7°C) and
is
warm enough so that ice
will
not adhere to the surface. When the
pointer
is
in
the
yellow
area the structure
is
approaching a "too hot"
condition. When the pOinter
is
in
the
red
arc, the structure
is
below
35°F
(1. 7°C) and indicates the anti-ice system should be used,
if
~
ing
through
visible
moisture.
4.
A
visual
inspection may be used to check for ice accumulations on
the wing leading edges.
• On aircraft 35-067 thru 35-415 and aircraft 36-018 thru
36-047,
the optional wing inspection light on the right fuselage
below the emergency exit may be used to check
for
ice buildup on
the wings during night operations. The wing inspection light,
in
itself,
is
inadequate
for
detecting the presence
of
ice near the wing
tips. The wing inspection light
is
illuminated by setting the
WING
INSPECTION switch (pedestal) to ON.
-_NOTE
~
If the presence of ice on the wing leading edge is sus-
,.
pected during night operations
in
atmospheric condi-
tions conducive to icing, the normal approach speeds
must be increased per the
WING
HEAT
FAILURE
LANDING
procedure
in
Section N - ABNORMAL
PROCEDURES.
2-64
FAA
APPROVED
4-30-76
REISSUED
2-25-81,
CHANGE
10
To Next Page
Loading...
