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OIL QUICK-DRAIN VALVE
An oil quick-drain
valve
is
optionally offered
to
replace
the
drain
plug in
the
oil
sump drain port.
The valve
provides
a
quicker
and
clean-
er
method
of
draining
engine
oil.
To
drain
the
oil with
this
valve
in-
stalled,
slip
a
hose over
the
end
of
the
valve,
route
the
hose
to
a suitable
container,
then
push
upward
on
the
end of
the
valve
until
it snaps
into
the
open position.
Spring clips will hold
the
valve
open.
After draining,
use
a screwdriver
or suitable
tool to
snap
the
valve
into
the
extended
(closed)
position and
remove
the
drain
hose.
CARBURETOR AIR
TEMPERATURE
GAGE
A carburetor
air
temperature
gage
may be installed
in
the
airplane
to
help detect
carburetor
icing
conditions.
The gage is marked
with a
yellow
are
between
-15°
and +5°C.
The yellow
are
indicates
the
carbu-
retor
temperature
range
where
carburetor
icing
can occur;
a placard
on
the
gage reads
"KEEP
NEEDLE
OUT OF
YELLOW ARC DURING
POSSI-
BLE ICING CONDITIONS.
"
Visible
moisture
or high humidity
can cause
carburetor
ice
formation,
especially
in idle or low power
conditions.
Under
cruising
conditions,
the
formation
of ice is usually
slow,
providing
time to
detect
the
loss of
RPM
caused
by
the
ice.
Carburetor
icing
during
take-off
is rare
since
the
full-
open
throttle
condition
is
less susceptible
to
ice
obstruction.
If
the
carburetor
air
temperature
gage
needle
moves
into
the
yellow
are during
potential
carburetor
icing
conditions,
or
there
is an unex-
plained
drop in RPM,
apply full carburetor
heat.
Upon regaining
the
original
RPM (with
heat off), determine
by
trial
and error
the
minimum
amount of
carburetor
heat
required
for
ice-free
operation.
NOTE
Carburetor
heat
should
not
be applied during
take-off
unless
absolutely
necessary
to
obtain
smooth
engine
acceleration
(usually
in sub-zero
temperatures).
7-8
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