On Dec 7, 9:56*am, Darryl Ramm wrote:
On Dec 7, 9:31*am, "Tim Mara" wrote:

If it is for use with a Transponder then the TSO is a
requirement....Transponders are TSO (only) installations and the requirement
for the TSO also is in connection with the altimeter....providing it is for
altitude reporting transponders (mode C)
tim
Please visit the Wings & Wheels website

I've already pojnted to the FARs ti clarify both main points but you
seem to be disagreeing so can you point to a FAR to substantiate
either claim here? So again/in more detail...

Transponders themselves are strictly a "meets the performance and
environmental requirements of TSO blah" see 14CFR 91.215 so it is
technically up to the person signing off the installation to determine
this. Which has allowed transponders without TSO approval to be
installed. But most shops will say that will only install a
Transponder with TSO approval. But this us really not relevant to the
original question.

For non-IFR aircraft I do not believe adding a transponder requires
the altimeter to be TSOed. See my earlier post and the FARs quoted
there.

If you want to disagree please quote the relevant FARs.

Darryl

Bzzzttt I've got to shoot myself here for getting missing the critical
regulation....

14CFR §91.217 Data correspondence between automatically reported
pressure altitude data and the pilot's altitude reference.

(a) No person may operate any automatic pressure altitude reporting
equipment associated with a radar beacon transponder—
....
(3) Unless the altimeters and digitizers in that equipment meet the
standards of TSO-C10b and TSO-C88, respectively.

---

But again its a "meet the standards of" wording, so that leaves some
wiggle room, but up to the person signing off the install. IFR
aircraft get linked in with stronger worded requirements via 91.411
that an allow an actual TSO approval and date of manufacture to used
instead of an IFR altimeter test--thats the only thing stronger than
"meet the standards of" wording I can find. But again many shops will
take that to mean the product must be manufactured under an actual TSO
approval.


Darryl