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I think you are right, I don't trust myself to
interpret the ADI properly in an emergency situation when the VSI and the
attitude diverge. I want an attitude indicator that functions like a
standard AI.
I have chosen an AI that is electric with a backup
battery. My plane has no vacuum system and I don't want to put one
in. Even if I loose all electric, I will still have Attitude (backup
battery), Airspeed (pitot/static), Altimeter (static) and Heading
(compass). That should be enough to get me home.
Doug
----- Original Message -----
Sent: Tuesday, May 29, 2007 2:09 PM
Subject: [LML] Re: Tru Trak ADI vs.
Standard AI
Douglas,
A standard AI is what I choose as my back-up to
my 2 screen Chelton system. I used the TSO'ed Mid-Continent 4300 series
and am very happy with it.
My thinking was this, flying with
EFIS's will be significantly different than what I am used to and what I have
been trained to fly. EFIS failures are a rather common occurence, I
don't know of anyone who has flown for any significant amount of time in their
EFIS experimental who hasn't had a failure of some type. (reboots,
lockups, sensor errors, etc.) Therefore, my backup is not only
significantly different than primary, but it is also what I am comfortable
using.
Chelton recommends pilots new to EFIS to get 40 hours of
hood work before launching into IFR weather. Do you want backup
instruments that also require new pilot training?
Micah
Froese
Lancair Legacy
150 hours
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