All M20Js Have Squat Switch?

[Jayhawk_aviator]

Should all M20Js have squat switch (not the limit switch, but the weight on wheels switch)?  I seem to recall in the IPC it is not applicable to all serial numbers.

 

Thanks,
Scott

[ArtVandelay]

I believe it's actually a airspeed switch, not a squat switch on the landing gear. At least that's the way it is for early Js

[KSMooniac]

Early J's have a squat switch on the left main gear. Later they went to an airspeed switch behind the ASI.

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[cnoe]

Early J's have a squat switch on the left main gear. Later they went to an airspeed switch behind the ASI.

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IIRC only the '77 J's have the squat switch. My '78 doesn't and also lacks all the associated hardware and wiring.

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[Marauder]

The air switch can also be found on some earlier vintage Mooneys (1960s vintage). My 1975 F has the mechanical switch.

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[Jayhawk_aviator]

Thanks guys...makes sense.  Mine is a 78 and has an airspeed switch, but no squat switch (weight on wheels).  Anyone know the airspeed that the airspeed switch activates?

 

[KSMooniac]

I don't recall exactly, but think it is in the neighborhood of 60 knots or so. Adjustable slightly, and easily damaged during pitot static checks.

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[kris_adams]

My '79 has the airspeed switch.  We overhauled the asi a few years ago and the shop forgot to adjust it before I departed.  I had to return and after spending 15 min on the phone with the local MSC (Joey Cole) they were able to get it adjusted in about an hour.  IIRC, it was set to between 75 and 80 MPH.

[bradp]

The service manual describes the squat versus airspeed switch.  The change to airspeed switch happened in ~ mid SN 1977 J models.  

 

Brad