Airspeed Switch On 67M20F Electric Gear

[kahoe5a4]

Hey guys The gear is finally coming up on my Mooney with electric gear around 85-90 mph as opposed to the 70 its supposed to retract at. Does anyone know what the system is that manages gear retraction (Speed Switch). I am told its a diaphragm but have yet to find any parts for sale to replace it as I ve been told by mechanics it cant be adjusted because its stuck. Help!  

[Andy95W]

I had a 67 M20C with electric gear. The switch is plumbed into the pitot pressure line that goes to the airspeed indicator. If you had a leak in the system, the airspeed indicator would also read low. Since yours doesn't, the internal parts of the switch are probably getting "gummy" so now it takes more force (air pressure) to activate the electrical switch.

Have your mechanics check with the big shops like LASAR, Dugosh, Don Maxwell, SWTA, etc. to get a replacement. Not adjustable or repairable that I've ever seen. Normally it is located behind the left sidewall near the pilot's left calf.

[OR75]

look for that bronze color part behing the A/S indicator in the attached picture

On a J, it is part 940016-511 or -513  or 880016-513 

good luck in your search

[kahoe5a4]

Wow gentlemen! Thank you for the help. Have a nice day.