7-25 STALL WARNING SYSTEM
SERIAL NUMBERS 100-0001 THROUGH 100-0042
For the serial numbers listed above, the aircraft is equipped with a vane-type
stall warning sensor, installed in the leading edge of the left wing. The vane
is connected to a stall warning horn located in the overhead panel above the
pilot seat. The vane in the wing senses the change in airow over the wing
occurring at or near stall. The warning horn will activate at airspeeds between
5 and 10 knots above the stall in all airplane congurations for wings level
unaccelerated stalls.
The stall warning system should be checked during the preight inspection of
the aircraft by actuating the vane in the wing while the battery master switch
is ON. The system is functioning properly if the warning horn sounds as the
vane is pushed upward.
The stall warning system is protected by a circuit breaker labeled STALL
WRN. The circuit breaker may be pulled to deactivate the stall warning horn
should the vane stick in the ON position.
SERIAL NUMBERS 100-0043 AND UP OR TKS-EQUIPPED
PLANES
For the serial numbers listed above, and for airplanes equipped with the
TKS ice protection system, the airplane has a Safe Flight Lift Transducer
Stall Warning system which consists of a lift transducer mounted on the left
wing and a stall warning computer which is mounted overhead in the forward
cabin. The stall warning computer monitors the signal from the vane and
the ap position signal and schedules the stall warning to provide consistent
warning margins to the stall regardless of ap setting. The ap 0° setting is
on one schedule and aps 10-35° are on a separate schedule. This provides
approximately 6 KCAS of stall warning margin at all ap settings.
The vane and sensor unit in the leading edge of the wing is equipped with
a heating element which is only activated in aircraft which have the optional
TKS Ice Protection System Installed. For information regarding the heating
element, refer to the TKS Ice Protection System Supplement.
Additional Components of the Safe Flight Lift Transducer System
The airplane is equipped with a weight on wheels switch. This switch prevents
the stall warning horn from sounding while performing ground operations.
The Safe Flight Lift Transducer Stall Warning system is equipped with a Press
to Test button which will test functionality of the system during any phase of
operation. The Press to Test button is located on the pilot’s side instrument
panel, left of the backup attitude display indicator. If the system is functioning
normally and the Press to Test is pressed, the stall warning horn will sound. If
the stall warning horn is not heard while pressing the Press to Test button, the
Safe Flight Lift Transducer Stall Warning system is not functioning properly
and is considered inoperative.
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