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Cessna 402C - Page 225

Cessna 402C
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r;L402C
SECTION
7
AIRPLANE
&
SYSTEMS
DESCRIPTIONS
event
of
an
engine
fuel
pump
failure,
the
auxiliary
fuel
pump
will
supply
fuel
to
the
englne
if
the
auxiliary
fuel
pump
switches
are
on.
The
main
tank
is
vented
to
the
atmo
sphere by a
combi
na
t;
on
fl u
sh
vent
and
a .50- inch
diameter drain located
on
the
lower
surface of the
wing.
The
flush-mounted
vent
el
iminates
the
need
for
heated
vents.
The
fuel
tanks
are
serviced
through a
flush
filler
located
in
the
top
surface
of
each wing.
FUel
SELECTORS
Two
fuel
selectors,
mechanically connected to fuel valves located in
thel
wings,
are
provided
for
each
engine.
The
selectors,
located
on
the
floor
between
the
pilot
and
copilot
seats,
allow
selection
of
main
fuel,
cross-
feed
and
no
fuel.
During nonnal
fl
ight
operations,
position
the
left
fuel
selector
to
LEFT
MAIN
and
the
right
fuel
selector
to
RIGHT
MAIN.
This allows fuel
to
flow
from each
main
tank,
through
the
fuel
selector,
to
the
respective
engine-
driven
fuel
pump.
Fuel
may
be
crossfed
from
the
left
main
tank
to
the
right
engine
or
from
the
right
main tank
to
the
left
engine.
Both
engines
will
be
supplied
with fuel
from
the
right
main
tank
when
both fuel
selec-
tors
are
positioned
to
RIGHT
MAIN.
Conversely,
both
engines
will
be
sup-
plied
with fuel from
the
left
main
tank
when
both
fuel
selectors
are
posi-
tioned
to
LEFT
MAIN.
The
crossfeed
function
is
used
for
balancing
asym-
metric
fuel
loads
and
supplying
the
engine-driven
fuel
pump
from
the
oppo-
site
main
tank.
The
LEFT
ENG
OFF
position
or
RIGHT
ENG
OFF
position
(the
center
button
must
be
depressed
as
the
selector
valve
is
rotated
to
the
off
position)
on
the
fuel
selectors
allows
no
fuel
to
flow
to
the
engine~driven
fuel
pump.
The
fuel
selector
handles
form
the
pointers
for
the
selectors.
The
ends
of
the
handles
are
arrow-shaped and
point
to
the
position
on
the
selector
placard
which
corresponds
to
the
position
of
the
control
valves.
EMERGENCY CROSSFEED SHUTOFF LEVER
A
two-position
emergency
crossfeed
shutoff
lever
is
located
between
the
fuel
selector
handles.
When
the
shutoff
lever
is
pulled
up,
crossfeeding
~
of
main
tank
fuel and
heater
operation
is
stopped.
This
lever
is
for
emer-
gency
crossfeed
control
only,
since
its
function
is
to
isolate
the
fuel
crossfeed
lines
from
the
fuel
tanks
in
the
event
of
a
nacelle,
wing
or
center
section
-fire
or
a wheels
up
landing.
AUXILIARY
FUEL
PUMP
SWITCHES
A
3-position
aUXiliary
fuel
pump
switch,
see
Figure
7-18,
is
provided
for
each
main
fuel
tank
pump
providing
5.5
PSI
pressure
for
vapor
clearing
and
purging.
In
the
LOW
position,
the
auxil
iary
fuel
pumps
operate
at
low
speed.
The
ON
position
runs
the
auxiliary
fuel
pumps
at
low
speed,
as
long
as
the
engine-driven
pumps
are
functioning.
With
an
engine-driven
pump
failure
and
the
switch
in
the
ON
position,
the
auxiliary
pump
on
that
side
will
switch
to
high speed
automatically,
providing
sufficient
fuel
for
all
partial-power
engine
operations.
FUEL
DRAIN
VALVES
Fuel
quick-drain
valves
are
provided
for
each fuel
tank,
fuel
filter
and
crossfeed
line.
The
drains
provide a
location
for
removing
moisture
and
sediment from
the
fuel system.
The
drains,
located
on
the
lower
surface
of
the
main
tanks,
are
actuated
by
depressing
the
lower
portion
of
the
valve.
A
special
screwdriver
is
prOVided with
the
airplane
which
allows
a 2-ounce
sample to
be
drained
and
inspected
without
fuel
spillage.
I
November
1979
Revision
4 - 1 December
1983
7-21

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