Look at your own aircraft TCDS (type certificate data sheet) and what is
listed as "required equipment"
if is says there an altimeter, then it needs an altimeter.if it says an
altimeter model # ---- or equivilent meeting TSO ---- or ESA ---- ect then
you have to have one that meets or exceeds this standard of certifcation....
if it's not in the "required" instrument list then it isn't needed to meet
the TCDS...
there are really NO flight computers or electric variometers that ahve any
certifications...nearly all Winter Mechanical instruments including
variometers have ESA form one type approvals.few if any others do...PZL's
had some national certifcations but at the time they were most common this
was not recognised outside the old eastern block..today they might (not
sure, we really don't see many new PZL's) same for many others...obviously
PDA's, ClearNav's ect have no approval certificates at all but you will find
them common in gliders...they are simply "not required" by TCDS...this
however does not mean that just anyone can install them in any way they
want.the installations still have to be performed in such a way as outlined
in AC4313.....log entries, Wt/Bal ect still has to be performed, aircraft
type hardware, cables ect also should meet AC4313 ect.
you'll get unfortunately different answers from mechanics and even
(especially) the FAA inspectors themselves....so it does tend to remain
"grey" and subject to the that one paricular official's interpetation.
tim

Please visit the Wings & Wheels website at www.wingsandwheels.com

"jcarlyle" wrote in message
...
Who determines "required equipment" for Form One? I've got Form Ones
for things that aren't on either the Minimum Equipment List or the
Master Equipment List, while I'm missing Form Ones for things that ARE
on the Minimum Equipment List! Seems very haphazard - maybe it is a
"bureaucrazy"...

-John

On Nov 26, 3:45 pm, John Smith wrote:
Roughly said, yes. EASA Form 1 ist the exact equivalent of the FAA Form
8130–3, it even has the same blocks. (And EASA honors FAA 8130-3 forms.)

Form 1 (or an equivalent certificate) is only required for required
equipment.

I'm not sure how transponders, radios and ELTs are handled because they
are not required but must be approved somehow.