Beechcraft Duchess 76 - Safety Retraction Switch; Warning Horn

Section VII
Systems Description
SAFETY RETRACTION SWITCH
BEECH CRAFT
Duchess 76
To prevent inadvertent retraction of the landing gear on the
ground, a safety pressure switch is installed in the pitot
system to deactivate the hydraulic pressure pump circuit
. when the impact air pressure is below 59 to 63 knots.
WARNING
Never rely on
the safety switch to keep the gear
down during taxi, take-off roll, or landing roll.
Always make certain that the landing
gear switch
handle is in
the down position during these oper-
ations.
WARNING HORN
If either or both throttles are retarded below an engine setting
sufficient to sustain flight and the landing gear is retracted,
the landing gear warning horn will sound intermittently. Also,
when the flaps are extended beyond approximately 16°, the
warning horn will sound, regardless of throttle position, if the
landing gear is not down and locked.
WARNING HORN "Q" SWITCH
An optional "Q" switch is available to prevent the gear
warning hom from sounding with the throttle(s) retarded
and the landing
gear retracted. In order for the "Q" switch
to interrupt the gear warning horn, the airspeed must be
above 99
to 106 KIAS and the flaps must be retracted
above approximately 16°.
7-12
August, 1980