Jay Honeck wrote:
I just purchased a Garmin GTX-327 off of Ebay (installed for one day, before
the owner decided he REALLY wanted the Mode S GTX-330!), and am lining up
installation. I was surprised to hear that a 337 form had to be filed for
this installation.
It's not a big deal for the avionics shop to do, but wouldn't you think
Garmin would have STC'd this unit for the Cherokee line?

Having an STC isn't really the issue. It's whether a particular shop (or
a particular FSDO) considers the installation a "major alteration" or a
minor one. There a probably shops that would swap two similar
transponders with just a logbook entry, but most would probably do a 337
just to cover themselves. Heck, my buddy's avionics shop does a 337 for
practically anything it does.

-- Jay


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