Avionics fan motor

[Jetrn]

Need help in finding a brushed motor for the avionics fan.  Original motor manufactured by TRW electronics which cross references to allied motion and or globe motors but unable to find an equivalent part number.  Original part number 19a2790 and c414007-010.  Has anyone sourced a motor off of digikey, mouser, or rs-online?

 I have dis-assembled the motor, internals look good hope it just needs a cleaning to solve the mechanical noise problem.

any help would be greatly appreciated.

[LANCECASPER]

 

Call Allied mentioned in the above post and ask for Bobbie Eldredge.

[Fly Boomer]

13 minutes ago, Jetrn said:

19a2790

Google this number.  I got dozens of hits.

[Jetrn]

Thank you for the responses, called allied under FAA phone number and was quoted $600 to repair.  Also, spoke with another department part can be made with a 52 week lead time and requires a request for quote.  
I think I will clean it and return it to service for now. I’ll update if I find a suitable alternative motor

[Rick Junkin]

50 minutes ago, Jetrn said:

Need help in finding a brushed motor for the avionics fan.  Original motor manufactured by TRW electronics which cross references to allied motion and or globe motors but unable to find an equivalent part number.  Original part number 19a2790 and c414007-010.  Has anyone sourced a motor off of digikey, mouser, or rs-online?

 I have dis-assembled the motor, internals look good hope it just needs a cleaning to solve the mechanical noise problem.

any help would be greatly appreciated.

I have the avionics blower from an M20M. I’ll be at the hangar later today and I’ll see if the motor is the same part number. It’s an 1989 vintage with over 4000 hours on it so may not be your best option. 

Cheers,
Rick

[N201MKTurbo]

If it is making mechanical noise, replace the bearings if they are ball bearings. If they are plain bearings, clean and lube them.

[Pinecone]

It looks like an old brushed motor from the early days of electric RC planes.

You can probably find a replacement by dimensions.  Diameter and length.

[Jetrn]

It is a brushed motor. I dissembled it, cleaned with contact cleaner. The brass bushings are good. Assembled it and applied a dab of Dow silicon grease to shaft end opposite of the fan.  I also removed the old rigid rubber from the mounting plate on the fan and installed the fan to the airframe with a piece of sound deadening material. Fan assembly runs significantly quieter now.

[LANCECASPER]

On 4/4/2024 at 11:29 AM, Jetrn said:

It is a brushed motor. I dissembled it, cleaned with contact cleaner. The brass bushings are good. Assembled it and applied a dab of Dow silicon grease to shaft end opposite of the fan.  I also removed the old rigid rubber from the mounting plate on the fan and installed the fan to the airframe with a piece of sound deadening material. Fan assembly runs significantly quieter now.

Those are most likely not just brass bushings, they are Oilite, which are brass bushings impregnated with oil. The oil needs to be replenished eventually (or the bushings can be replaced). I wouldn’t use any other lubrication than what they recommend.  

https://shop.hpceurope.com/docTech/an/TechCoussinetOILITE.pdf

[N201MKTurbo]

I’ve had the best luck with 3-in-1 oil for things like that.

[Rick Junkin]

My removed avionics fan motor is the same part number. Sounds like you have yours squared away!

Cheers,
Junkman

[Kenfen]

Globe is not servicing these motors any longer.  All searches turned up nothing or aftermarket fans that were not easily integrated.  Here is my solution for an "Owner Produced" replacement on my 12 volt system:

1.  CAD'ed up a manifold based on Bendix King KA20.  Sent it to Xometry.  ~$72 with shipping.

2.  Ordered IP68-rated (I'll let you look that up) 2.2 Amp 12 volt Axial Box Fan from DigiKey.  ~$32 with shipping.  The spec sheet is available on the website.  You will have to research further if you have a 28 volt system.
2223-CFM-6025BG68-1120-587-ND
CFM-6025BG68-1120-587
DC AXIAL FAN, 60 MM SQUARE, 25 M

3. Ordered a cheap Fan guard from DigiKey and broke it apart to only use the plastic grid (you probably don't need this):
1053-1392-ND
GRM60-45
FAN FILTER 60MM 45PPI

If you are lucky, your bracket holding the original KA20 is still there.  You may have to drill some new holes.

If you call Xometry, perhaps you can reference up my order number and they'll print it for you.  I made the wire conduit channel too small and had to do some post-boring.  OR ... I'll send you the CAD model for $20 (just to cover my time).

 

Edited March 19 by Kenfen

[KSMooniac]

Very nice work!  I like that even better than my recent (but not yet posted) 3-D printed SIRS compass mount.