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
The four amber indicator lights, labeled LAND, illuminate when the
landing gear is down. Neither set of lights is illuminated when the landing
gear is in transit. The single red indicator light, labeled PUMP, comes on
when current is being supplied to the landing gear pump motor. If the motor
continues running during flight or goes on and off repeatedly, the motor
should be shut off by pulling the LANDING GEAR MOTOR circuit
breaker, since continual running of the motor can result in premature motor
failure. Prior to landing, the circuit breaker should be pushed in to reactivate
the circuit. If an indicator light should fail to come on when pressed for
testing check wiring and gear position. Beyond this, reference the service
manual for the gear advisory, document A-10037. The WATER, LAND,
and PUMP light circuits are protected by the Landing Gear Advisory circuit
breaker, and are therefore independent of the landing gear motor circuit and
will function when using the emergency hand pump.
NOTE: The pilot should always visually check the nose gear before
attempting a water landing to assure that it is up regardless of lights. If
the pull ram mechanically fails, it could travel and show a light but not
be connected to the nose gear itself leaving the nose gear in the down
position. During deceleration after a water touchdown, with the gear
extended, the float bows will submerge and there is a high probability
of flipping the amphibian onto its back causing either fatal or serious
injury.
AUDIO ADVISORY OPERATION
The Landing Gear Advisory Unit, GC600, includes an audio output that is
connected to an audio output source (i.e. radio or audio panel) for verbal
pilot information regarding gear position. A static and pitot pressure source
is connected to the Unit which determines airspeed. The Landing Gear
Advisory Unit has an arming speed set by the factory and a trigger point set
at approximately 80 knots. Refer to section 2.3 of the Gear Advisory
Service Manual A-10037 for further information.
The GC600 audio announcements are dependent on airspeed “ARM” and
“TRIGGER” settings, which are factory pre-set for the aircraft type. The
GC600 is armed by the aircraft exceeding the pre-set airspeed. As the
aircraft begins its approach, it slows its airspeed passing through the pre-set
trigger speed, and sounding an audio announcement to indicate the gear
position. If the gear is not in a fully retracted or a fully deployed position,
then a gear unsafe announcement will sound.
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