BEECHCRAFT
Duchess 76
ENVIRONMENTAL SYSTEMS
CABIN HEATING
Section VII
Systems
Description
A 45,000 Btu-per-hour combustion air heater, located
on
the
right side in the nose compartment, provides heated air for
cabin warming and windshield defrosting. The heater system
consists of a combustion
air
heater, three-position control
switch, three push-pull control knobs, heater circuit breaker,
manual reset limit (overheat) switch, combustion air blower,
ventilation air blower, and a duct thermostat.
Fuel for the combustion heater is routed from the
righLwing
fuel system, through a solenoid valve, to the heater fuel
pump located under the heater, and into the combustion
chamber of the heater. Fuel consumption
of
the heater is
approximately
213
gallons
per
hour and should be considered
during flight planning.
NOTE
The fuel solenoid is energized only if the duct
thermostat, which controls the heater, requires a
higher temperature.
Three outlets are located in
the
cabin to distribute the heated
air into the cabin. One outlet is located on the lower forward
cabin bulkhead and provides heated air for the pilot and
copilot compartment.
The
second outlet is located between
the pilot and copilot seats and faces aft, to provide heated air
to the aft cabin area.
The
defrost duct is routed from the
heater
to
the windshield outlet for windshield defrosting.
January
1978
7-35
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