[h[l[M[BDrnu;lm
ANTI-ICE SYSTEMS (CONT)
NACEllE
HEAT
The
NAC HEAT switches energize both naceUe heat
and
engine inlet air
I
pressure and temperature sensor heat. If installed, the NAC HEAT ON light
or
optional L
or
R NAC
HEAT
lights
will
illuminate anytime a NAC
HEAT
switch is
set
On.
On
aircraft 35-067 thru
35-244
and
36-018
thru 36-044
not
incorporating
AAK
79-4, the NAC HEAT switches also energize en-
gine anti-ice.
'CAUTKJN
I~
2-74
To prevent damage
to
the
engine inlet sensor heating
el-
ement, naceUe heat operation should
be
limited to
30
seconds
if
the engine is
not
running.
• Wumination of
the
L
or
R ENG ICE lights with
the
NAC
HEAT
switches
On
indicates
that
bleed air pres-
sure
is not being applied
to
the
naceUe
heat
anti-ice
system
due
to
a malfunction.
• Wumination of
the
L
or
R ENG ICE lights with
the
NAC
HEAT
switches OFF indicates
that
bleed air
pressure
is
being applied
to
the
naceUe
heat
system
due
to
a malfunction.
FAA APPROVED 4-30-76
REISSUED
2-25-81, CHANGE
10
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