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Section VIII
BEECHCRAFT Sundowner
180
Handling, Serv
-
Maint
C23 (M-1285 and After)
SERVICING
FUEL
SYSTEM
FUEL CELLS
See Consumable Materials for recommended
fuel
grades.
CAUTION
See Avco
Lycoming
Service
Letter
No. L185A
or
later revision for operation
on
alternate
fuels.
Two 29.9
gallon
fuel tanks are
located
in
the wings
just
outboard
of the wing
root.
A
visual measuring
tab
located
below
the tank filler neck facilitates
a fuel load of 15
gallons
when
the
fuel
reaches
the
bottom of
the
tab, or 20
gallons
when
the
fuel reaches
the top
of
the slot. This
partial
filling of
the
fuel
tanks
allows an
increase
in
the
payload.
The
fuel indicators
on
the
instrument
panel will
indicate
full
tanks even
though
each tank contains only 20
gallons
of
fuel.
CAUTION
Connect
a grounding
cable from the
fuel
ser-
vice unit
to the airframe,
and
connect
ground-
ing
cables
from both the fuel
service unit and
the
airplane to
ground
during
fueling
opera-
tions. This
procedure
reduces
fire hazard.
FUEL DRAINS
Open
each
of
the
fuel drain
valves
daily
to remove
any
condensation
from
the system. The two tank sump
drains
extend through the
bottom
of the
wing
skins,
near
the
landing
gear.
M-1971, M-1980 and after
have
flush-type
drain valves.
Flush-type valves are
actuated
by pushing
up
with
the Flush Fuel
Drain
Tool
and
holding
until
the
desired
amount
of
f
uel
has
drained.
The
valve
will
8-12
February 1979
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