"Bob Kuykendall" wrote in message
om...
Earlier, (Paul Lee) wrote:

Is 337 required in a new kit project?
It is for "Major repairs and alterations".

The way I understand it, form 337 records a deviation between a
particular aircraft or subassembly and its type certification data.
Homebuilts, by and large (there are exceptions), do not hold type
certification, so form 337 is neither required nor valid for them.

No, homebuilts are type certificated under Part 21 as Experimental.