Cessna 402B 1973 - Page 32

to
flush
the
cold
oil
from
the
governors
and
propeller
hubs.
Electrical
equipment
should be managed
to assure adequate
alternator
charging
throughout
the
flight,
since cold weather
adversely
affects
battery
capa-
city.
During
letdown,
watch
engine
temperature closely
and carry
sufficient
power
to maintain
them
above
operating minimums.
The
pitot,
tip tank
vents and stall warning
heater
switch
should be
turned
oN
at least
5
minutes
before entering potential
icing
conditions
(2
minutes
if on
ground)
so
that these
units
will
be warm enough
to
prevent
formation
of
ice.
Preveffing
ice
is
preferable
to
attemptiag
its removal
once it
has formed.
Refer
to
Section
Vtr
for
Optionat Cold
Weather
Equipment.
FUEt
SYSTEM
Fuel
for each engine
is
supplied by a main
tank
(b0
gallons
usable)
on
each
wing
tip. Each
engine
has its
own complete
fuel
system;
the
two sys-
tems are
interconnected
only by a cross feed
for emergency
use.
Vapor
and
excess
fuel
from
the
engines
are
returned
to
the
main
fuel
tanks.
sub-
merged
electric
auxiliary
pumps
ia
the
main
tueI
tanks
supply
fuel
for
priming
and starting,
and for engine
operation
as
a back
up system
to the
engine-driven pumps,
Refer
to
Figwe
2-2
f.or
FueI
System
Schematic
and Auxiliary,
and
Optional Wing l,ocker FueI
Systems
paragraphs
in
Section
VII
for
additional
fuel
system management
information.
NOTE
During
very hot
weather,
if
there is
an indication
of vapor in
the
fuel system
(fluctuating
fuel
flow)
or
anytime
when
climbing
above
72,000 feet,
turn
the
aud.Iiary
fueI
pumps
ON
until cruising
altitude
has
been
attained and
t}le
system is
purged
(usually
5
to
15 minutes
a^fter
establishing
cruising
flight).
It is
recommended
that
the mixture
remain
at
the
climb
mixture
setting for approximately
5
minutes
after
establishing
cruising
flight
before
leaning
is
initiated"
A
continuous
duty tip tank transfer
pump
is
installed in each main
tanlc
The
pumps
assure
avail,ability of
all
tip
tank fuel to
the
engine
supply line
2-15