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A/P disconnect for Century 21 / M20K ?


NicoN

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We have a 1980 M20K with a venerable Century 21 A/P.

I am missing a A/P disconnect button. My Co-owners say we have on the left yoke - but this button does exactly what is written on the sticker: trim interrupt.

 

Does the Century 21 A/P has the feature of a disconnect-button?

And in case it has this feature: is it typical for a M20K NOT having such a button?

And then - how could such a button be wired ?

I did not find a schematic or installation manual for a Century 21 so far

Edited by NicoN
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12 minutes ago, NicoN said:

We have a 1980 M20K with a venerable Century 21 A/P.

I am missing a A/P disconnect button. My Co-owners say we have on the left yoke - but this button does exactly what is written on the sticker: trim interrupt.

 

Does the Century 21 A/P has the feature of a disconnect-button?

And in case it has this feature: is it typical for a M20K NOT having such a button?

And then - how could such a button be wired ?

I did not find a schematic or installation manual for a Century 21 so far

I have a Century 41 A/P.  My electric trim switch is also my A/P disconnect.  

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2 minutes ago, NicoN said:

Does the Century 41 have a Auto-Trim-feature?

We have only electric trim, so this button seems not to be connected with the A/P at all (but I have never tried)

Yes, the 41 trims on its own.  It uses the same servo connected to the trim switch on my yoke.  My trim switch requires two actions to operate - push down and then rocker fore/aft.  I have attached a snip from the C41 manual because I don't have a good picture of the trim switch in the plane.554683794_C41Trim.thumb.PNG.fb9af21477dbfd9bb1c242e79288ef40.PNG

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  • 1 month later...
On 9/2/2019 at 3:06 PM, Bob Weber said:

Yes it does, there is a service bulletin out about it. Give a call if you would like 616 822 1999

I would like to come back on the Century 21 topic.

Does this A/P have a disconnect feature?

 

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4 hours ago, NicoN said:

I would like to come back on the Century 21 topic.

Does this A/P have a disconnect feature?

 

Here is what the manual says.

It appears not all installations have the disconnect on the yoke.

 Cheers,

Dan

2B232FEE-9500-4B56-8B18-2226BE5E1339.jpeg

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Correct.

But the Maintenance is not sure that it is possible and HOW to wire a button.

It should be easily possible if you know which pins have to be shorted (or opened).

AFAIK other century A/P have a pin on a connector which is connected to GND. If it is open  then the A/P goes off.

The disconnect button then should be a normally-closed model.

SOo, I simply need a wiring manual with the functions of the pins.

So far, I did not find a service or installation manual.

One once was on ebay, but is terribly expensive and no more available

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You might try sending an email to century tech support. I have had good luck getting little bits of info about  my c41 from them. You have to be patient though, I have had it take weeks to get a response.  But I’m guessing they would share the pin out schematic with you.

I want a service manual for the c41 but it’s hard to stomach $550, consider yourself lucky the C21 is only $300 ;)
 

cheers,

Dan

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So, I  got the information that  the M20K was not STC'd with a disconnect button. But what is the resason to renounce?

Do really all M20K equipped with a Century 21 have no A/P disconnect?

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