Newps writes:

Here in the Northeast, the FSDO will not approve an Air Gizmo at
all, and the avionics shop I talked to won't install it as a
result.

Why would they even ask FSDO in the first place? Don't they know
how to read?

Maybe because they are concerned about their livelihoods, should the
FSDO go after them for reading the regs differently than they do. The
usenet assurances of a pseudonymous "expert" won't serve as useful data.

- FChE