M20J - electric flap motor contactor

[unicom]

Hi all,

I need your help. The contactor of the electric motor operating the flaps (located under the rear last belly panel) is giving sign of tiredness. I guess it needs to be replaced. What is the part number ? Where could I get it from ? 
The serial number of my M20J is 24-0975.

Thanks in advance.

[ArtVandelay]

Are you talking about these limit switches:

[unicom]

Yes, this is exactly the switches I am talking about. The one that works erratically is the rear one, visible on you picture, next to the screw.

[EricJ]

That's a Honeywell V3L-3 microswitch which is the integrated switch and lever, or you can buy the V3-1 switch and JV-5 roller lever separately, which are often cheaper and easier to find than the full switch.

I've also recently sorted out that the V3L-3 is identical (in essentially all specs, dimensional, electrical, and mechanical), to an Eaton SS12ET10-102L3, which Lasar sells (for a lot of money for a switch).    My IPC and SMM spec the V3-1/JV-5 combo some places (like the flap limits) and the SS12ET10-102L3 in others, (like the throttle safety switch for the landing gear horn).   It's evidently the same switch, just the supplier part numbers are different.

Places like DigiKey often have these switches or just search for the part numbers online.

Something that often works as a temporary fix is to spray the crap out of it with contact cleaner.   That will often rehab them for a time, but perhaps not permanently.

[larryb]

Fortunately for you this is a standard part and available from non-aviation sources. Mouser has both in stock today. That said, the flap relays are problematic and could also be the source of your problem.

 

limit switch
Honeywell V3-1
https://www.alliedelec.com/honeywell-v3-1/70119063/
https://www.mouser.com/ProductDetail/Honeywell/V3-1?qs=0x4sLrpp94JcOlsy%2BnfV2g%3D%3D

roller lever:
Honeywell JV-5
https://www.alliedelec.com/honeywell-jv-5/70120150/
https://www.mouser.com/ProductDetail/Honeywell/JV-5?qs=%2Fha2pyFaduhUkHaxgJoyblOS5GVPIsARlMPyyFAJ6M4%3D

[ArtVandelay]

Yes, this is exactly the switches I am talking about. The one that works erratically is the rear one, visible on you picture, next to the screw.

I would try electronic cleaner on them first.

[carusoam]

Wow!

A real live Unicom sighting!

I think Unicom and I joined MS in the same timeframe...  

Its been a while.

+1 for the electronics cleaner and the micro switches... then replacement of the switch using the part number...

 

Best regards,

-a-

[unicom]

Thank you very much all for this detailed feedback. Tomorrow I will remove the faulty switch and clean it thoroughly. If it is doesn’t work I will buy the V3-1 switch and JV-5 which are available at Mouser.

Just out of curiosity, is there any difficulty to assemble the V3-1 with JV-5 ?

[unicom]

On 5/6/2021 at 7:46 AM, carusoam said:

Wow!

A real live Unicom sighting!

I think Unicom and I joined MS in the same timeframe...  

Its been a while.

[larryb]

Thank you very much all for this detailed feedback. Tomorrow I will remove the faulty switch and clean it thoroughly. If it is doesn’t work I will buy the V3-1 switch and JV-5 which are available at Mouser.
Just out of curiosity, is there any difficulty to assemble the V3-1 with JV-5 ?

Nope. The actuator is held in place with the switch mounting screws.

[Yetti]

Contact cleaner and exercise it on the plane.   Mine was flaky 2 years ago.  Contact cleaner fixed it.

[unicom]

Switch, roller and contacts with wires thoroughly cleaned... Yes, it is working again. I love this aircraft  !!!

I take this opportunity to testify that flaps up landings/ take off is absolutely a NO issue for the M20J.

Thanks again everyone for your valuable input.

[carusoam]

Great follow up, Unicom!

Best regards,

-a-