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Tim_Lewis(at)msm.umr.edu
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 Posted: Wed Feb 28, 2007 6:49 pm Post subject: GRT Lockup |
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Mike,
Extraordinarily valuable email. Thanks for posting it!
Tim
| Quote: | --
Tim Lewis -- HEF (Manassas, VA)
RV-6A N47TD -- 850 hrs
RV-10 #40059 under construction |
Stewart, Michael (ISS Atlanta) wrote: [quote] [quote]--> RV-List message posted by: "Stewart, Michael (ISS Atlanta)" <mike.stewart(at)us.ibm.com> (mike.stewart(at)us.ibm.com) As a survivor of a dual efis (GRT & BMA), single lockup, IMC, 2000'agl vectors to final approach, it was the a/p that broke the tie for me. One said left turn, one said right. My GRT locked up frozen on the efis screen in a turn. I was fortunate to have noticed the discrepancy. Disorientation set in in about 1 second as soon as it was noticed. You cant imagine the immediate brain confusion when the 2 EFIS's are not agreeing in a big way. Turn on the a/p and sort it out. A/p says BMA wins, and thats what I flew to the runway. It resulted in an emergency firmware update the following day by GRT. Turns out the EFIS did not like a GPS approach with no assigned runway in the database. Was a software bug. Would have been easier if the screen had just gone blank, but your don't get to choose your fail modes. Also as a side note, had I of had 2 GRT's, they both would have locked up and I'd of been on A/P alone. That would not have been fun, but doable. It can happen. I was happy that day I chose 2 different EFIS's. Probably saved my butt. Also, as was asked earlier on this thread, I have tested my Trio A/P in many unusual attitudes, and it will right me from the most ridicules attitudes every time. Mike Do not archive --
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Bruce(at)glasair.org
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| Posted: Wed Feb 28, 2007 7:23 pm Post subject: GRT Lockup |
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What's valuable is that he survived. There's many here who fly off into the clag with just an EFIS and a T&B. If that had happened to them, they would not be here.
Bruce
www.glasair.org
[quote]
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kahuna
Joined: 02 Feb 2007
Posts: 93
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| Posted: Thu Mar 01, 2007 3:42 am Post subject: GRT Lockup |
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Its very easy to get tunnel vision with an EFIS screen. With everything you need to fly on one screen, and I mean everything, your scan goes caput and you focus on everything on that one screen. There is a lot to process and it sure gets comfortable staring at one screen. It takes discipline to get off that screen and ‘compare notes’ so to speak with the other efis. Not hard when your whiz banging along, but very hard when your busy turning for the approach. I have to force myself to do it. Ive had way more vacuum issues than EFIS ones. So farJ No chance in the foreseeable future of vacuum going in my plane.
And thanks to all you guys sending the off list messages.
Best,
Mike
From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Bruce Gray
Sent: Wednesday, February 28, 2007 10:22 PM
To: rv-list(at)matronics.com
Subject: RE: GRT Lockup
What's valuable is that he survived. There's many here who fly off into the clag with just an EFIS and a T&B. If that had happened to them, they would not be here.
Bruce
www.glasair.org
[quote]
-----Original Message-----
From: owner-rv-list-server(at)matronics.com [mailto:owner-rv-list-server(at)matronics.com] On Behalf Of Tim Lewis
Sent: Wednesday, February 28, 2007 9:49 PM
To: rv-list(at)matronics.com
Subject: GRT Lockup
Mike,
Extraordinarily valuable email. Thanks for posting it!
Tim
| Quote: | | -- Tim Lewis -- HEF (Manassas, VA)RV-6A N47TD -- 850 hrsRV-10 #40059 under construction |
Stewart, Michael (ISS Atlanta) wrote: | Quote: | | --> RV-List message posted by: "Stewart, Michael (ISS Atlanta)" <mike.stewart(at)us.ibm.com> As a survivor of a dual efis (GRT & BMA), single lockup, IMC, 2000'aglvectors to final approach, it was the a/p that broke the tie for me. Onesaid left turn, one said right. My GRT locked up frozen on the efisscreen in a turn. I was fortunate to have noticed the discrepancy.Tim Lewis -- HEF (Manassas, VA) |
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