(7)
With control column in full forward position, slide mounting bracket forward until switch assembly actuates.
(8) Slide mounting bracket 0.13 inch forward, past actuation point, and secure by tightening screws.
(9) Connect electrical wires to the switch assembly.
(10) Install cabin floorboard panel 232AC. Refer to Chapter 6, Access Plates and Panels Identification - Description and
Operation.
(11) Restore electrical power to airplane.
6. Stall Warning Flight Operational Check
A. Perform a Flight Operational Check (Refer to Figure 201).
(1) Put the airplane in straight flight and trim it.
(2) Set the engine power to flight idle (approximately 65% Ng) while slowing to approximately 1.5 times the stall speed.
NOTE: The stall warning system will be checked at idle power.
(3) Reduce the airspeed with the elevator control until it is approximately 1.1 times the stall speed.
(4) Move the elevator control to slowly increase pitch attitude so that the airspeed decreases at a rate of no more than 1
knot per second. Do this until there is an unstoppable pitch down of the airplane, or the elevator control reaches the
stop.
NOTE: An approach rate of 1 knot per second is a much slower entry rate then is used on a normal
training stall.
NOTE: Up to the time the airplane pitches, it must be possible to produce and correct both roll and
yaw by normal use of the controls. During recovery, with normal use of the controls, it must be
possible to prevent: more than 15 degrees roll, more than 15 degrees yaw, and more than 30
degrees pitch below level flight.
(5) Record airplane speed that stall warning signal sounds.
(6) Record the airplane speed that the stall occurred.
NOTE: The stall is the indicated airspeed at which the airplane pitches down with the nose up
elevator being held by the pilot (usually around 10-12 degrees nose up), or it is the minimum
speed observed by the pilot with the elevator on the nose up stop if no pitch down has
occurred. The maximum time on the aft stop for elevator-limited stalls must be no more than 2
seconds.
(7) Make sure that you hear the stall warning signal at 6 to 14 KIAS with the flaps fully up before the stall.
(8) Make sure that you hear the stall warning signal at 8 to 18 KIAS with the flaps fully extended before the stall.
7. Stall Warning Detector Adjustment (Airplanes 20800001 thru 20800056)
A. Adjust the stall warning vane to give a stall warning signal at 6 to 14 KIAS with the flaps fully up before the stall. Refer to
Flight Operational Check.
B. Adjust the stall warning vane to give a stall warning signal at 8 to 18 KIAS with the flaps fully extended before the stall.
Refer to Flight Operational Check.
C. Adjust the stall warning vane to a higher position to set the stall warning horn to a faster airspeed, or adjust the stall
warning vane to a lower vane position to set the stall warning horn to a slower airspeed.
8. Stall Lift Transducer Adjustment (Airplanes 20800057 and On and 208B0001 and On)
A. Do the Stall Lift Transducer Adjustment (Refer to Figure 201).
(1) Make sure the airplane master switches are set in the OFF position.
(2) Remove the screws that attach the lower wing panel 503BB. Refer to Chapter 6, Access Plates and Panels
Identification - Description and Operation.
(3) Using a 5/64 (19.837 mm) Allen hex wrench, adjust the Lift Transducer as follows:
(a) Clockwise: The warning signal will sound at a lower airspeed.
(b) Counter Clockwise: The warning signal will sound at a higher airspeed.
(4) Install the lower wing panel 503BB with the attaching screws. Refer to Chapter 6, Access Plates and Panels
Identification - Description and Operation.
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