turned
auxiliary
fuel and
vapor.
H sufficient
space
is
not
available
in
the
main tanks
for
this
returned
fuel, the
main
tanks
may
overflow through
the
vent
line.
When
operating
from
the
auxiliary
fuel tanks, the tanks will
run
dry
sooner
and
endurance
will be
less
than may
be
anticipated
since
part
of
the fuel
is
being
diverted
back
to
the
main tanks
instead
of
being
consumed
by
the engines. However, main tank
endurance
will be
increased
by the
returned
fuel.
COLD
WEATHER
EQUIPMENT
IU
WINTERIZATION
KIT.
For
continuous
operation
in
temperatures
consistently
below
20°F,
the
Cessna
winterization
kit,
available
from
your
Cessna
Dealer,
should
be
installed
to
improve
engine operation. The
kit
consists
of
two
baffles
for
the
front
engine, one baffle
for
the
rear
engine, and
crankcase
breather
insulation
for
both engines. Once
installed,
the
crankcase
breather
insu-
lation
is
approved for
permanent
use
in both
cold
and
hot
weather.
Use of the cowl flaps
as
required
is
also
recommended
to keep
the
engine
temperatures
within the
normal
operating
range.
GROUND
SERVICE
PLUG
RECEPTACLE.
A ground
service
plug
receptacle
may
be
installed
to
permit
the
use
of
an
external
power
source
for
cold
weather
starting
and during lengthy
maintenance
work
on
the
airplane
electrical
system
(with the exception of
electronic
equipment).
NOTE
Electrical
power
for
the
airplane
electrical
circuits
is
provided through a
split
bus
bar
having
all
electronic
circuits
on one
section
of the bus and lighting and gen-
eral
electrical
circuits
on
the
other
section
of the
bus.
When
an
external
power
source
is
connected, a
split
bus
contactor automatically
removes
power
from
the
electronic
section
of the
split
bus to
protect
against
damage to the
transistors
in the
electronic
equipment
by
transient
voltage
from
the power
source.
There-
fore,
the
external
power
source
can not be
used
when
f
checking
electronic
components.
f
Just
before
connecting
an
external
power
source
(generator
type
or
bat-
11
tery
cart),
the
master
switch should be
turned
on.
'0
~
l
~
..
The
ground
service
plug
receptacle
circuit
incorporates
a
polarity
reversal
protection. Power
from
the
external
power
source
will flow only
r
if
the
ground
service
plug
is
correctly
connected to the
airplane.
If
the
plug
is
accidentally connected
backwards,
no
power will flow to the
air-
plane's
electrical
system,
thereby preventing any damage to
electrical
equipment.
The
battery
and
external
power
circuits
have been designed to
com-
I I
pletely
eliminate
the need to
"jumper"
across
the
battery
contactor
to
close
it
for
charging
a completely
"dead"
battery.
A
special
fused
circuit
in
the
external
power
system
supplies
the needed
"jumper"
across
the
contacts
"I
so
that
with a
"dead"
battery
and
an
external
power
source
appUed,
turn-
ing on the
master
switch will
close
the
battery
contactor. 0
OIL DILUTION
SYSTEM.
H your
airplane
is
equipped with
an
oil dilution
system
and
very
low
temperatures
are
anticipated, dilute the oil in
each
engine
prior
to engine
shut
down by
energizing
the oil dilution switch with the engines
operating
at
1500 RPM, and with the
auxiliary
fuel pump
switches
in
the "LOW
tl
position. (Refer
to
figure 7 -1
for
dilution
time
for
the antiCipated
temperature.)
While diluting the oil, the oil
pressure
should be watched
for any unusual fluctuations
that
might indicate a
screen
being clogged
with sludge washed down
by
fuel.
NOTE
On the
first
operation
of the
oil
dilution
system
each
season,
use
the
full dilution
period,
drain
the oil
in
each
engine,
clean
the
screens,
refill
with new oil
and
redilute
as
required.
7-3
j
,j
7-2
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