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1320 Lb STC

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26 Apr 2022 12:41 #1 by Bruce Bennett
Replied by Bruce Bennett on topic 1320 Lb STC
Thanks Larry. You saved me $200. No way will I ever reduce the elevator to 9 degrees. With all of the detail Alpha gives about the STC requirements on their web site, I'm shocked they make no mention of what is an important alteration.

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26 Apr 2022 09:04 #2 by Larry Snyder
Replied by Larry Snyder on topic 1320 Lb STC
Basically, the FAA did not think the Ercoupe was spinproof enough at 1400 pounds with 13° of up travel, so they required it to be reduced to 9°. The item that allowed for the 1320 STC was the reduction in elevator travel, a la the D model.
I’ve had some folks tell me 9° was not a problem, but others have said it is. I imagine it depends on the speeds at which you land. If you land a little faster it probably won’t be any different. But if you slow it almost to the point it drops, you might be surprised when it drops sooner.

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26 Apr 2022 08:57 #3 by Larry Snyder
Replied by Larry Snyder on topic 1320 Lb STC
Sorry, Bruce, but the STC does require limiting elevator up travel to 9 degrees. For some reason the only place this is spelled out is in the STC itself. To be sure, I sent a note to Don at Alpha. Here is his response:

Limiting the elevator travel to 9 degrees is the core item that allows the increase to 1320.

It is covered in the Stc documents and you should have your a/p verify that the stc requirements have been met and that your aircraft is in full compliance.

Sincerely
Don

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26 Apr 2022 00:50 #4 by Bruce Bennett
Replied by Bruce Bennett on topic 1320 Lb STC
Alpha Aviation's 1320 lb STC does not require an Elevator angle change, only a change to the wider 1 3/8" trim tab if your C model has the original 3/4" trim tab.
It is basically a paperwork STC.
Per Fred Weick, the Ercoupe designer, the D model's 13 degree to 9 degree change was unnecessary. Tribal knowledge says at 9 degrees the landing flair
is practically non-existant but that discussion is for a different topic.

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22 Apr 2022 15:27 #5 by Ron Holmes
Replied by Ron Holmes on topic 1320 Lb STC
I am in your court and wondering the same thing...

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03 Feb 2022 20:20 #6 by Morris Pearson
1320 Lb STC was created by Morris Pearson
Considering the 1320 Lb STC. I see that the STC required the elevator be restricted to 9 degrees of up travel. My 415 C still has the original 13 degrees of up travel. Was wondering if anyone has done the STC and how it affected the plane with the restricted pitch limit? I seem to remember that ERCO had a disagreement with the FAA on the 9 degree elevator for the D model that caused them to produce the C/D version for a while keeping the 13 degree pitch limit.

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