1976 m20f executive gear retract problem

[Guitarmaster]

  On 2/5/2020 at 8:32 PM, Ripley98 said:

Does anyone know where I can get a squat switch for this year.


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Mouser

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[Guitarmaster]

  On 2/5/2020 at 8:32 PM, Ripley98 said:

Does anyone know where I can get a squat switch for this year.


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Are you sure it's bad? It looks like mine did, only moving about 1/16". Try adjusting it 1/8" closer to the pressure plate.

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[Ripley98]

Not sure if it is bad at the moment, just wanting to make sure I can still get the part. I called Lasar today and still waiting to hear back on which airspeed conversion to go with. Seems like an expensive option to go with.


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[Guitarmaster]

  On 2/5/2020 at 11:09 PM, Ripley98 said:

Not sure if it is bad at the moment, just wanting to make sure I can still get the part. I called Lasar today and still waiting to hear back on which airspeed conversion to go with. Seems like an expensive option to go with.


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If I were a betting man, I would bet that switch is perfectly fine. It's just out of adjustment.
In the event you do need to get a new one, Mouser electronics carries them. A few years ago they were about $200.

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[carusoam]

The squat switch is both temperature sensitive and donut age sensitive...

If the squat switch isn’t working because it is cold out...check the age of the donuts... 

If you have a forever-plane... the airspeed switch ‘upgrade’ is a nice expensive way to update the gear safety system...

PP thoughts only, not a mechanic...

Best regards,

-a-

[Hank]

  On 2/6/2020 at 4:18 AM, carusoam said:

If you have a forever-plane... the airspeed switch ‘upgrade’ is a nice expensive way to update the gear safety system...

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You're killing me! As if 11 new donuts plus labor isn't an expensive fix . . . . .

[carusoam]

Hank,

I was so focussed on what I was writing... I missed what I wasn’t writing... 

Donuts are terribly expensive....

The heavier the plane, the faster the donuts get flattened out...

 

Apparently donuts are temperature sensitive and change volume/shrink when it is cold out...

 

Does anyone adjust the squat switch as the donuts compress over time/temp?

PP thinking out loud, not a mechanic...

Best regards,

-a-

[Guest]

6 “O” rings and 2 quarts of hydraulic oil are a lot cheaper than the Lord manufactured shock discs!  Ah the joys of oleo landing gear.

Clarence

[Ripley98]

Ok wanted to give an update. The plane has been kept in a heated hangar the whole time. Gear pucks are new, (from 2016). Squat switch is adjusted properly and everything is freshly greased. The problem only occurs once in awhile but there is still a ten second delay sometimes before the gear comes up. Anybody have any other suggestions at all? My A&P has been working on Mooneys for many years and has never came across this problem.


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[Guitarmaster]

Solonoid?

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[Ripley98]

  On 2/9/2020 at 11:34 PM, Guitarmaster said:

Solonoid?

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Checked them both and they passed the test.


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[carusoam]

There is a specific measurement the mechanic does to verify the donut’s compression...

If he has the book, followed the procedure, measured the gap properly, the donuts have an age molded in them... that is great... (double check his work/details to be sure)not a trust issue, just a what to work on next issue... trust, but verify...

Post a pic of the date code... is that a 16 or a 91? (Ask @Hank )

The rest is working through every switch, motor, and relay... there is a thread around here of why and how to get the motor OH’d... somebody has done one very recently...

starts with getting the electrical drawing for your plane...

Kind of mechanic’s 101...

A real pain when it is intermittent.

PP thoughts only, not a mechanic...

Best regards,

-a-

[Ripley98]

Does anybody know if a J model gear switch with the bypass button will work? If so, who might have one for sale?


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[Ripley98]

Up limit switch was the problem, glad to have it fixed.


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[carusoam]

Great follow-up Ripley!

Thanks for sharing the detail.

Best regards,

-a-