FACT:
Are TSO Instruments required in certificated aircraft?
Altimeter, airspeed, avionics, anything......
. The problem is, if they're not TSO'd, on what basis are you
installing
them? To be installed as an aircraft part, whatever you are installing
must be a standard part (not applicable to instruments - we're talking
hardware, wire, etc.), a TSO'd part, a TC'd/STC'd part, a PMA'd part,
or a part manufactured by the owner-operator. Otherwise it's not an
aircraft part, and will require a field approval.
But what if it's not? What if the manufacturer has no authorization
from the FAA of any kind? Not going to happen. Can't install it. Not
unless you get an STC or field approval.
That's it in a NUT SHELL
