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BEECHCRAFT
Sundowner
180
Section
VII
C23 (M-1285 and After)
Systems
Description
available,
100
(Green) or
100LL
(Blue) grade aviation
i
gasolines may
be
used.
CAUTION
See
Avco Lycoming
Service
Letter
No. L185A
or later
revision
for operation
on
alternate
fuels.
FUEL
TANKS
Fuel
tanks
located
in
each
wing
leading edge
have
a nomi-
naf
capacity
of
29.9 gallons.
In
the filler neck of each
tank
is
a
visual
measuring
tab
which
permits
partial
filling
of
the fuel
system.
When
the fuel touches the
bottom of
the
tab
it
indicates
15 gallons of fuel, and
when
filled to the
slot
in
the tab
it
indicates 20 gallons of fuel. The
indicating
system
reads full at 20
gallons.
The
pilot must
visually
check the fuel
level during
preflight
to ascertain
desired
level.
Fuel is
fed from
the
desired
tank
through
a fuel
selector
valve in
the
center floorboard
and
then
through
a
strainer
to the engine-driven
fuel
pump.
FUEL
DRAINS
Two
tank sump
drains
extend through the
bottom
of the
wing skins, near
the
fuselage. M-1971, M-1980
and after
have flush-type drain valves. The system low spot drain is
incorporated in
the
fuel
strainer on the
lower right
side of
the
fuselage
att of the
nose wheel. Sump drains provide
a
means
to
visually
inspect
the
fuel
for water
or
contaminants.
Refer
to HANDLING, SERVICING
AND MAINTENANCE
Section
for procedures
describing
how and
when
to use
fuel tank
sump
drains.
FUEL QUANTITY
INDICATORS
Fuel
quantity
is measured
by
a
float
operated sensor,
10-
cated
in
each
wing
tank system.
These
transmit electrical
August, 1980
7-21
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