section
VII
Systems
Description
FUEL DRAINS
BEECHCRAFT
Duchess
76
The fuel system is drained at eight locations, four on each
wing. A flush sump drain valve is located outboard of each
nacelle
on
the underside of each
wing
tank. A drain is also
provided for the fuel selector valve, located in the outboard
underside of each nacelle aft of the firewall. Two flush drains
are located inboard
of
each main
gear
wheel well for draining
the crossfeed fuel lines.
The fuel selector valve drains are actuated
manually
by
pushing up, approximately one-quarter inch, on the lower
portion of the drain valve. All other fuel drains are flush-type
valves
and are
actuated
by using the combination fuel
drain/emergency landing gear tool provided with the loose
tools and equipment. Flush-type fuel drains are actuated by
pushing in on the valve and then releasing when the desired
amount of fuel has been drained.
These
drain valves can be
locked open for the purpose of fuel off-loading
or
for totally
draining
the
fuel
system.
Pushing in and turning coun-
terclockwise will lock the drains in
the
open position. To
close, turn clockwise and release.
FUEL QUANTITY INDICATORS
Fuel quantity
is
measured by
two
float-operated sensors
located in each wing tank system.
The
sensors transmit
electrical signals to the individual indicators, located on the
instrument panel, which indicate the
amount
of
fuel remain-
ing
in
each tank.
AUXILIARY FUEL PUMPS
mhe';releGt'r]0'Yauxniary';fuel·;pumps:";8~4l§fi'g~fffi!~figif\i~;
are
located
in
the nacelle just aft of
the
firewall.
They
are control-
led
by
separate rocker-type
ON-OFF
switches, placarded
AUX FUEL PUMP
- L ON - R ON, located on the pilot's
subpanel. The auxiliary fuel pumps provide
pressure
for
7-24
April
1979
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