On Mar 13, 11:33 am, "Steve Foley" wrote:
Is this a blanket statement, or are some FSDOs issuing them and some not?

Every FSDO is a kingtom unto itself. I hear there are still a few,
here and there, where the old guys are hanging on, and doing things as
they have always done them, essentially ignoring the directives from
above. Haven't actually seen it.

I know that in the Houston FSDO, unless there is specific guidance for
the field approval (such as for the installation of a GPS), it won't
happen. Owner-produced modifications? Only if you can prove they are
identical to a certified part.

Michael