Cessna 182 1973 - Oil Quick-Drain Valve; Carburetor Air Temperature Gage

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