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Question: Are we required to file this form (FAA Form 337) when adding a GPS or autopilot to our experimental aircraft? Rick


[FAA Form 337 is required when major alterations are made to certified
aircraft and doesn't apply to homebuilt experimentals.  If you remember,
back in March of this year we had a significant discussion here regarding
what needs to be reported, what doesn't, and what's the best (and legal)
way to be sure that your butt is covered with both the FAA and your insurance company.  In particular, there's an excellent post from Scott
Krueger on March 14, 1999, which included copies of letters to/from him
and the FAA regarding changes he made along the way to his airplane.  The
FAA should be notified with a letter describing the change which puts the
ball in their court to decide whether or not the modification is significant enough to warrant additional flight testing hours or not.
The fact that the letter is sent (and received, so get a receipt) covers
you with them legally, and this slams the door shut on the insurance company's
ability to suggest that there were modifications made to the aircraft which
might have voided the airworthiness certificate should they be called upon
to pay a claim.  I hope this helps.   <Marv>   ]

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