TWIN COMANCHE C/R
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Fuel Selector
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COWL FLAP
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Rudder Trim And Flap Controls
Located in the inboard end of the right flap is a lock which holds the flap in the UP position so that it
can be used as a step for entry or exit. A second lock is incorporated to prevent the flap from going full
down in case a step load is applied and ;the up lock is not fully engaged.
FUEL SYSTEM
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The fuel is carried in four integral fuel cells located in the leading edge sections of the wings. Capacity
of the two main fuel cells is 30 gallons each, of which 27 gallons is usable.
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The auxiliary fuel system consists of two 15 gallon cells (all usable) installed in the wings just
outboard of the main fuel cells. Wing tip tanks are available as optional equipment on the normally
aspirated Twin Comanche C/R and standard equipment on the Turbocharged Twin Comanche C/R.
AUXILIARY FUEL AND TIP TANK FUEL IS TO BE USED IN LEVEL FLIGHT ONLY.
The cells should be kept full of fuel during storage of the airplane to prevent accumulation of moisture
and deterioration of the cells. For storage of more than ten days without fuel, the cells should be coated
with light engine oil to prevent excessive drying.
During normal operation use the engine driven fuel pump to draw fuel from the cell directly adjacent
to that engine. However, fuel can be drawn from any cell to both engines through use of the engine driven
fuel pump or the electric auxiliary fuel pump.
For emergency single engine operation a crossfeed is provided to increase the range.
The fuel strainers for the system are located beneath the floor panel in the center section of the
fuselage. Daily draining of the strainers may be accomplished in the cockpit by opening the hinged access
door located in the floor panel just aft of the fuel selector handles and pulling up on the knob located in
the center of the selector valve. The general procedure for draining the fuel system is to open the strainer
quick drain for several seconds with the fuel cell selector on the main cell, then to change the selector to
the auxiliary cell and repeat the process. To drain tip tanks, if installed, turn the master switch on and
follow the procedure for the main and auxiliary cells. Allow enough fuel flow to clear the lines as well as
the strainer. Positive fuel flow shut-off can be observed through the clear plastic tube that carries the fuel
ANPLANEANDSYSTEMS
ISSUED: June 1,197O
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