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
instal-
led, slip
a
hose
over
the end
of
the valve and 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
arc
between -15° and
+5°C.
The yellow
arc
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
manifold
pressure
caused
by
the ice.
Carburetor
icing during
take-off is
rare
since the
full-open throttle
condition
is less susceptible
to ice ob-
struction.
If
the
carburetor
air
temperature
gage needle moves into the yellow
arc
during
potential carburetor
icing conditions,
or there
is an unexplained
drop
in
manifold
pressure,
apply
full carburetor
heat.
Upon
regaining the
original
manifold
pressure
(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).
7-15
Содержание 182 1973
Страница 3: ......