In the UK it is mandated to have backups of both airspeed and altimeter. For
good
reason.
Recently some members even managed to get approval for backups that are digital
instruments - based on a safety case that they are no less reliable than
conventional
electric/vacuum gauges. Obviously need battery backups and be wired
on separate circuits.
The Dynon D2 looks ideal as a backup. I have a Dynon D10A which acts as a full
6-pack augmenting the steam gauges. Oddly l prefer the steam gauge display as
they take less time to check (on account of the needle positions being stored
as a 'picture' in one's head). Dr Joyce may be able to expand on this in
medical
terms?
Regarding IFR, individual aircraft are being assessed in the UK for eligibility
for night/IFR use. I believe that Dynon displays may be considered acceptable
even without TSO (???)
--------
John Wighton
Europa XS trigear G-IPOD
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