STALL WARNING
STALL WARNING HORN, INDICATOR, AND DETECTOR
The stall warning system consists of a lift detector electrically connected to a stall warning horn. As
stalling conditions are approached, lift detector will activate stall warning horn.
The lift detector is located on leading edge of left wing. A tab extends beyond leading edge at the point
where lift detector is mounted. With master switch in ON position, gently lift tab; stall warning horn should
activate.
REMOVAL OF LIFT DETECTOR
—NOTE—
The master switch must be off prior to performing any work on
lift detector, warning horn or light. P/ace reference marks on
holding plate and wing skin for use when installing wing.
1. Remove four screws holding plate around tab. Lift detector is fastened to plate; remove unit from
wing.
2. Mark electrical wires and terminals to facilitate Installation. Remove electrical wires from lift detector;
remove lift detector from aircraft.
INSTALLATION OF LIFT DETECTOR
l. Attach electrical wires to correct terminals on lift detector.
2. Position lift detector with mounting plate on wing. Ensure that sensor blade drops down freely; secure
in position with four screws.
ADJUSTMENT OF LIFT DETECTOR
—CAUTION—
Never try to adjust switch by bending vane.
The lift detector is adjusted at the factory. No further adjustment is required during the normal service life
of airplane.
After installation of a new switch, airplane must be test flown to a stall condition as follows:
1. Flaps - Up (0°)
2. Power- Idle
3. Stall warning must come on not less than five or more than l0 miles per hour before the actual stall.
4. Move switch up to increase speed that stall warning comes on, or down to decrease speed that stall
warning comes on.
5. Retest system until within parameters.
—NOTE—
Stall warning system adjustments may require several test flights.
27- 91 - 00
Page 27 - 42
Reissued: August 1, 1986
1L17
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
To Next Page
Loading...
