"Jose" wrote in message
. com...
Eh? How did you make THAT leap? Or ANY of those leaps?

Not to speak for Emily, but I made that leap long ago, on the basis of
quite a few threads.

If you think that an owner polishing and pampering his/her bird, making
sure that every working part is functioning perfectly at all times, is
tantamount to "performing illegal maintenance"...

You were talking about illegally replacing a landing light with an
unapproved part. Now I agree with you that the approval process is too
daunting for best safety, but I disagree with you that Joe Pilot (or Jay
Pilot) should be allowed to do different because he thinks so.

Jose
--
"Never trust anything that can think for itself, if you can't see where
it keeps its brain." (chapter 10 of book 3 - Harry Potter).
for Email, make the obvious change in the address.

The light bulb issue is not so obvious as it at first appears. For example,
we did not actually establish whether or not there was more than one variant
of the 4509 or of the Q4509, whether they were regarded as interchangeable,
or whether there was any difference between brands. A call to Piper, or
even to the local FSDO, could be illuminating.

As to the issue of the "notch" and "tit" elsewhere in this thread: I seen
and heard a few mechanics blow some smoke over the years. Every traditional
sealed beam bulb that I have ever examined has included a means of locking
it in a particular orientation in the "bucket". Where there is both a high
and low bean, the requirement is clear. In single filament bulbs, I suspect
that it is mainly for interchangeability of the "buckets"; although some
bulbs do have different horizontal and vertical beam spreads.

My best guess is that the highest prices have little to do with quality or
approval, but much to do with low inventory turnover. Some parts may be
stocked as a courtesy, and therefore held in inventory for long periods.
There may also have been a shipping cost associated with only one or two
light bulbs.

Peter