Cessna 402B 1973 - SECTION VII OPTIONAL SYSTEMS; Auxiliary Fuel System

SEGTION
Y[[
OPTIO NAT SYSTEMS
This section
contains a description, operating
ptocedures,
and
perfor-
mance
data
(when
applicable) for some
of
the
optional
equipment which
may
be installed in
your
aircrafL
Contact
your
Cessna Dealer for a com-
plete
list
of
available
Qptional
Equipment.
AUXIIIARY
FUEL
SYSTEM
Auxiliary
tanks
(20
gal
usable
each wing) are
installed in
each wing
just
outboard
of
each engine
nacelle and
feed
directly to the
fuel selector
valves.
Fuel
vapor
and excess fuel from
the
engines are returned
to the
main fuel
tanks.
The auxiliary tank is vented into
the
main
tank.
The
main
tank
is in furn vented
to atmosphere.
When the selector
valve
handles are
in the AIDOLIARY
position,
the
left
auxiliary
tank
feeds
the
left engine and
the
right
auxiliary tank
feeds
the
right
engine. The
fuel
quantity
indicator
continuously
indicates
fuel
remaining
in
the
tanks selected. When the
fuel
selector handles are
in
the AIDflLIARY
position,
AIIX TANK
indicator lights
will
illuminate and
the
tuel
quantity gage
will
indicate
the
fuel
in
the
auxiliary
tanks
(pounds
in
white and
gallons
in
blue).
When the
fuel selector handles are
in the
MAIN
positioq
the
fuel
quantity
gage
will
indicate
the
fuel
in the
main
tanks.
A
three-position
switch,
spring-loaded
to
OFF,
allows
checking
fuel
quantity
in
the tanks not selected.
The
switch, adjacent
to the
auxil-
iary
tank
indicator
lights,
is
labeled
MAIN,
OFF, and AIDi By
position-
ing the
switch
to the
appropriate
tank
position,
the fuel
quantify
in that
tank
will be
indicated
on the
fuel
quantity
gage.
If
the
arxiliary
tanks
are to
be used, select
fuel from
the
main
tanks
for
60
minutes
prior
to switching to
auxiliary
tanks.
This is
necessary
to
provide
space
in
the
main
tanks
for
vapor
and fuel
returned
from
the
engine-driven fuel
pumps
when operating on
ar:xiliary
tanks.
If
sufficient
space is not
available in
the
main
tanks
for
this diverted
fuel
the tanks
may
overflow
through
the
vent
line. Since
part
of the
fuel from
the
arx-
iliary
tanls
is
diverted
back to the
main
tanks instead of
being
consumed
by
the
engines
these tanks
will
run
dry
sooner
than
may
be
anticipated.
7-l