1111111
••••
al
ALC
AI
UGHf
DJ.UMINATED
IDuminanon
of
the
amber ALe
AI
light indicates
the
alcohol level
in
the
windshield/radome alcohol reservoir is low
or
depleted.
1. WSHLD/RAOOME Switch - OFF
when
alcohol stops fbwing.
2.
After landing,
assure
alcohol reservoir is properly replenished.
ENGINE
ICE
INGESTION
Engine ice ingestion
can
result
in
fan
damage
and
abnormal engine
opera-
tion. Engine ice ingestion can
be
suspected whenever
iGe
is shed from
the
wing, fuselage, windshield,
or
nacelle. This
may
occur
when
anti-ice
systems
are energized after significant ice accumulation
has
occurred
on
the
above
surfaces. Ice ingestion may
be
evident by a
change
in engine sound
or
fre-
quency, audible report,
sharp
rise in Turbine Temperature (fIT),
or
RPM
hang-up.
Experience
to
date
has shown that, if
proper
procedures
are
observed,
there
is a very high probability of satisfactory engine
operation
after experiencing
foreign object
damage
from ice in
the
engine fan.
Such
damage
can
reduce
the
compressor stall margin
so
that
the
engine could
become
more sensitive
to
rapid thrust lever movements, inlet pressure profile variation
due
to
ma-
neuvering,
and
high RPM operation.
Some
compressor
stalls
will
result in
engine flameout.
1.
AIR IGN Switches -
On.
Leave
On
for
the
duration of
the
condition.
2. Thrust Lever movements should
be
slow
and
cautious.
3.
Engine
RPM
-
Set
as
low
as
possible
to
maintain anti-icing
heat
and
cabin pressure.
4.
Avoid
any
abrupt changes in pitch, yaw
or
roll.
5.
To
determine
extent
of
engine damage
due
to
ice ingestion, pro-
ceed
as
follows:
a. Thrust Levers (one
at
a time) - Retard
to
flight idle.
Then
cau-
tiously advance
and
check for any vibration
or
abnonnal noise
on
each
engine.
If compressor stall is encountered, retard thrust lever un-
til
smooth operation
is
obtained. (If
any
of the fan blades
have
been
damaged, the noise level
and
frequency
will
increase with
an
increase of RPM).
FAA
APPROVED
4·30·76
REISSUED
2·25·81,
CHANGE
10
4-1
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