Appreciate the additional information, but you sidestepped the
question.

You said earlier "Form 1 (or an equivalent certificate) is only
required for required equipment." I said earlier "I'm missing Form
Ones for things that are on the Minimum Equipment List!"

The MEL defines required equipment, doesn't it? If not, what IS the
definition of "required equipment" used to trigger the use of a Form
One?

-John

On Nov 27, 8:35 am, John Smith wrote:
You can have your wrist watch TSOed if you wish and pay for it, but it
isn't required.

On the other hand, even TSOed instruments don't nessecairily come with a
Form 1. They most probably will today, but Form 1 is just a standardized
format for describing to which TSO a given aircraft part conforms, but
you can ask the manufactorer to confirm this in handwriting on the back
of a used envelope if you prefer this. This won't make anybody's life
easier, though. And don't forget that Form 1 didn't even exist a couple
of years ago, so the TSO certification of older instrument will most
probably have some random format unless they have been overhauled recently.

On yet another hand, you can even fill out a Form 1 also for non-TSOed
parts, if you like. Just leave block 13 empty or fill in: not TSOed.