Quote: Bennett
Of course, as an uncertified piece of equipment, I wouldn't really want to fly an approach with it either (I've ordered mine as an alternative to installing a 2nd certified AI in an open hole as a backup, having had my flight director get lazy and roll over in flight) but....
I'm curious as to whether you think the core feature, the attitude indication, is really less acurate/reliable than our certified gear? For me the other elements like speed, altitude are gravy - for me this is primarially a backup for a spinning gyro which is prone to failure. The rest is also available on my 530...
And assuming that the AI portion works really well, would it really be a big deal to use to fly an approach if needed for the failure of the primary AI? Actually I'm comfortable flying an approach without the AI if necessary; but often the trick in IMC is recognizing the AI failure before it becomes a unusual attitude - so the crosscheck is super valueable!
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I think that the Dynon D-1 will provide a perfectly good attitude indication. I've had Dynon glass screens in my LSA and the AI function was as good as any I have used. The unit has a set up routine to get the horizon level, and once this is done all else seems to work fine. The rate of turn indication on the D-1 is very responsive, as is pitch and roll. I woiuld have no issue using it in IMC if my primary AI failed. To be fair, the D-1 is a back-up to a back-up. I have a Mid Continent electic AI with battery back-up, but we all know that Murphy is an optimist. When things go to hell, everything seems to fail at the same time. The D-1 is, in my opinion, cheap insurance when it comes to AI failures in IMC. I've had two instances of vacuum pump failure in actual, and I am wary. The GPS altitude and ground speed tapes are nice, in that in an emergency, all data is in one place. It is doubtful that one would lose the pitot static system at the same time, but stuff happens, and the D-1 gives you a place to concentrate on. Recognizing AI failure can be a problem if the vacuum system winds down slowly. I find myself cross checking the vacuum AI with the electric AI even in VFR conditions. Nice to see agreement.