> "Dana Overall" <[email protected]> writes:
> The IFR equipment install must be TSO'd equipment to
> legally use the system but supporting equipment such as
> airspeed, altimeter, and so on, do not have to be TSO'd.
This is a common impression, that avionics must be TSO'd.
But which FAR, by number please, requires "TSO'd avionics"
under Part-91 operations, IFR or VFR ?? None that I am
aware of, but I may be wrong ( ...again :).
The Narco MK-12, MK-12A, and MK-12B for instance,
full of vacuum tubes and never certified by Narco to satisfy
any TSO, were flown by us-oldtimers for many years in the
hardest-IFR. Its VOR/LOC nav receiver and indicator were
self-certified for IFR use by the pilot using any of several rather
crude functional tests at designated time intervals. Some still
fly these radios, which FAR prohibits this ?
The more recent absurdities of Installation Certifications
and TSO's applying to GPS navs are another bag of worms
but do not retroactively include the VHF/UHF nav arena
( ie, VOR, LOC, and GS ) or the LF NDB/ADF.
The com radio, OTOH, must meet the 0.025 mHz spacing
requirements of the 21st century. While this is most easily
done by pointing to a TSO, that TSO is not an all-inclusive
requirement. See FAR 21.303 and the keywords =may=
and =when required=.
IMHO, always subject to error and willing to accept the
FARs as-written.
Art Cacella 1970 American AA-1 N6155L "Dinkie", flying 33 yrs.
1972 KR-1 plans, still not started on <sigh>
2004 Sonerai-I, on gear w/engine, making wings
2004 Moni-m/G, on gear, mounting engine & wings
2004 Polly, mini-RV-6, mounting engine & gear
200? Intrepid, all metal canard pusher, 4-pl, parts
Winston-Salem, NC
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