stall warning horn on M20J--simple fix

[Bill_Pyles]

I have to share this simple fix.  I posted on this site that my stall warning horn stayed on continuously wherever the master swith was on, whether I was flying or sitting still.  No one came up with the fix,

Atlantic Aviation at KDVT fixed fixed the problem in this way:

Turns out that the whole stall horn mechanism had somehow shifted in the wing in such a way that the stall tab would bottom out on the lower edge of the aperture in the leading edge of the wing thereby disallowing the switch to turn off. All they needed to do was remove a few thousandths of material on the lower edge of the aperture and the tab can now fall to its lowest point thereby turning off the stall horn switch. Cost about $23 for them to rectify the situation.

I hope this helps others who experience the same problem.

[KSMooniac]

If the vane assembly shifted in the wing, I'm not sure enlarging the cutout was the right course of action!  It should be repositioned to the correct location so that it activates at an appropriate angle of attack.

[Parker_Woodruff]

You should be able to adjust the assembly inside the wing.  I had to do this on my M20J so that the stall horn would actually turn on before the wing was stalled.

[Bill_Pyles]

Indeed, I need to go stall the airplane to see if the switch needs adjustment.