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Interesting thought on form 337

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bob turner

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Dropping an .020 crank into an 85 - the .020 grind is an STC. When I did my Stroker it never occurred to me to think about this:

I am modifying an engine, not an aircraft.

The instructions say to fill out blocks 4,5,6, and 7 when the crank is installed in the engine.

Then, presumably after the 48 hour deadline for filing with the FAA, when the engine is installed in an aircraft, complete blocks 1 and 2, and send one copy to the FSDO (now, just to OKC).

So just as an observation, it becomes critical to note in the engine logbook the N- number and serial number of the airframe, assuming anyone down the line would want to verify that a 337 was filed, since all 337s are presumably filed with airframe records? And what date does the engine log refer to - the date of signing, or the date of entry in the airframe records? Enquiring minds . . .
 

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