While I have voiced my
opinions of a glass panel single AHRS system before on this list, I still think
that a good vacuum AI, ASI, and altimeter are needed as viable backup for IFR
operations. If I had mega bucks I’d go with Dual EFIS and AHRS with a
cross comparator and the vacuum AI, ASI, and altimeter as backups. The Garmin
900 and Megitt can be had with dual AHRS, I don’t think the Chelton can.
-----Original Message-----
From: Lancair Mailing List
[mailto:lml@lancaironline.net] On Behalf Of VTAILJEFF@aol.com
Sent: Thursday, December 20, 2007
7:38 AM
To: lml@lancaironline.net
Subject: [LML] Re: Skoppe lancair
4 pt
In a
message dated 12/19/2007 8:24:33 P.M. Central Standard Time,
troneill@charter.net writes:
Would a Garmin 396 GPS, running on its own battery, on flight
panel, be useful?
It
would be useful if you had the time to go from the standard nav page to the
backup instrument panel page while the airplane was going through some pretty
good gyrations and recover it to S&L flight. Can you do that on a 396? The
question you have to ask yourself (from the movie "Dirty Harry") is
"do you feel lucky?" or have you practiced flying off the 396 with
nothing else operating. Can you keep the airplane upright for 20-30 minutes
while you navigate to VMC conditions? If so, then it is a minimalist backup
system-- if not then you need something else.
Designing
one of these panels, IMHO, is an exercise in NOT putting all your eggs in one
basket.