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Ercoupe O-200 STC Prop question

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27 Sep 2025 11:13 #1 by Frank Hamelly
Replied by Frank Hamelly on topic Ercoupe O-200 STC Prop question
Randall. I found a document which may be the field approval although I can’t say Inhave ever seen one which applies to my serial number only and includes a flight manual supplement provided by the Atlanta , Georgia filed office. So I guess I am good to go. Mike. ( Frank is my partner/brother).

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27 Sep 2025 11:00 #2 by Frank Hamelly
Replied by Frank Hamelly on topic Ercoupe O-200 STC Prop question
It was part of the STC as far as I know but will have to research it. Frankly, I don’t care and no one else seems to. Was just annualed in August. It hits static rpm and flies well. The only difference is the pitch. Let me do some looking.

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24 Sep 2025 11:00 #3 by Randall Hirsch
Replied by Randall Hirsch on topic Ercoupe O-200 STC Prop question
Frank any field approvals in your log history for the prop? This Ercoupe had the 6950 at the time of purchase and had been through many Annual inspections without issue. This IA was the first to catch it. I suspect there are several others in the field that may have the same issue.

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24 Sep 2025 10:40 #4 by Frank Hamelly
Replied by Frank Hamelly on topic Ercoupe O-200 STC Prop question
Mine is a 6950 and works just fine. I bought it that way for what it is worth.

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24 Sep 2025 09:20 #5 by Larry Snyder
Replied by Larry Snyder on topic Ercoupe O-200 STC Prop question
That is the best route. I’m not familiar with the TCDS for the Alon, but the Ercoupe TCDS ties very specific props to specific engines. Since no Ercoupe/Forney/Alon came from the factory with an O-200, I assume no such combination appears in the TCDS for the airplane, only in the STC. Let us know if you get the field approval - it’s always good to know which FSDOs will do that!

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24 Sep 2025 08:48 #6 by Randall Hirsch
Replied by Randall Hirsch on topic Ercoupe O-200 STC Prop question
Thanks for the input John and Matt! We are aware that the prop is allowed in the O-200 TCDS. My IA is working on a field approval with the feds in Nashville. Hopefully it all goes well.

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