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C-90 with Sensenich W72GK44 field approval

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Junior Member
Jun 15, 2013
Reaction score
Hello Gents.
I just fitted a Sensenich W72GK44 to my C-90 Piper L-4
It’s running too high static RPM’s - about 2400 and only 2300 is alloved according the TCDS for the J3.

However this setup is legal on the Pa-11.

Is there a field approval 337 for this setup on the J3?


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