Mike Spera wrote:

A couple of points made during the thread worth mentioning. First,
even if the part number is the same, technically the part has no
traceable history evidenced by paperwork. Hence, installing it in an
airplane without paperwork/pedigree may render the airplane unairworthy.



I have bought the 4509 landing lights at my FBO as well as at the auto
parts store. There's no paper trail from the FBO for that light. It
comes in the same box sometimes. The only paper I get is the standard
purchase receipt printed on the FBO's standard receipt they give for any
sale. I never keep these for small purchases like bulbs or other small
hardware I may buy. The thought is laughable.
Do what you like. I keep ALL my receipts.

There is absolutely no
difference between the bulbs. If I put one in your hand from the FBO
and one from NAPA you can't tell which is which.
Which is precisely the point I made later in the posting


And the insurance
company does not go looking for a part, any part, that isn't legal to
deny a claim. An unapproved part has to have played a likely role in
the wreck, your state insurance regulations see to that.
Which is precisely the point I made later in the posting. I have no idea
of what the individual state regulations are, so I cannot speculate
whether there is any protection there.

Happy Flying,
Mike