Piper Arrow IV Turbo Maintenance Manual page 278

Loosen the two Phillips head screws; one on either side of the vane. If the stall warning comes on too late,
move the switch up. If the stall warning comes on too early; move the switch down. Retighten the screws after
making any adjustments.
The only way to test the accuracy of the setting is to fly the airplane into a stall condition and NOTE the
speed at which the stall warning comes on. The stall should be made with the flaps up and power off. It may be
necessary to make several test flights and alternate adjustments before the desired setting is obtained. The stall
warning should come on not less than five or more than ten miles per hour before the actual stall occurs.
PIPER AIRCRAFT
PA-28RT-201 / 201T
MAINTENANCE MANUAL
—CAUTION—
Never try to adjust the switch by bending the vane.
Figure 27-22. Flap Rigging
1L14
27-91-03
Page 27-43
Revised: August 8, 1984