Tom-D
Taxi to Parking
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Tom-D
Wrong.
Wrong again. Field approval of unapproved parts for required flight instruments is hardly "easy," and installation of such unapproved parts for such a purpose is the fast track to an FAA enforcement action.
This response is absolutely laughable in as much as a person of this stature doesn't know who declares airworthiness of the aircraft and what rules they comply with in so doing.
You also do not realize that all replacement parts are treated the same in the FARs The instruments in the panel as well as the parts built in the field as repairs are all returned to service by the A&P or A&P-IA Who have performance rules in FAR 43 to comply with.
Those compliance rules say nothing about quality of the parts, they either meet the requirements of the production certificate / TCDS or their properly altered condition. or they do not.
There is no FAR rule that mentions "Aircraft quality" as you inferred in your statement, that you avoided answering when you tried to spin this thread.
Just because the TCDS or the production certificate mentions a part number which relates to a make or model of any instrument, does not mean you must use that instrument, simply because there are manufacturer up grades, PMA equivalent, field approved alternatives, and STCed replacements. plus some are simply a minor change, on a log book entry.