265 Shannon Lane
Priest River ID 83856
TITLE: Supplemental Airplane Flight Manual
A-10060
03/04/15
Cessna 206 on Model 3400 Floats
REVISION: D
FAA Approved
LANDING GEAR OPERATION
To retract or extend the landing gear, pull out on the landing gear handle
and move it to the desired position. When the handle is positioned,
electrical power is directed to one of two solenoid relays, which energize
the reversible electric motor. The Emergency Hand Pump lever must be in
the OFF position (which points the end of the handle toward the pilot seat.)
in order for the electric pump to pump fluid. The electric motor powers the
hydraulic pump and actuates two hydraulic gear actuators in each float in
the appropriate direction. During operation of the landing gear motor, the
“PUMP” indicator light is illuminated. When the hydraulic rams have
enough resistance on them, typically by achieving full travel of the ram,
pressure will build triggering the electric pressure switches that in turn
activate the relays to turn the pump off. Proximity sensors are located on all
four gear, feeding appropriate gear position to the Landing Gear Advisory
Unit illuminating the appropriate (WATER or LAND) lights. Again, the
pressure in the system turns the pump on and off, not the proximity sensors.
EMERGENCY HAND PUMP SELECTOR VALVE AND HAND
PUMP
A three position emergency hand pump selector valve combined with a
single action hand pump is located between the crew seats and is for use in
the event the normal hydraulic system fails. The selector valve has three
positions, labeled UP, DOWN, and OFF which points the end of the handle
toward the pilot seat. To select gear position with the emergency hand pump
selector, rotate the handle to UP (clockwise 90 degrees) or DOWN
(counterclockwise 90 degrees).
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