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Date: Mon, 15 Aug 2011 10:23:51 -0400
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Subject: Re: [LML] Speaking of EFIS "Failure"....
From: RONALD STEVENS <ronald@sdc.com>
Thread-Topic: [LML] Speaking of EFIS "Failure"....
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Yes this would screw me up big time as well......but I do have a Garmin
430 as well, so having a backup GPS does make sense. I am about to install
the Garmin GTN750 which also has its own GPS (I am not sharing the
antenna) and a dynon EFIS (with battery) as backup. (when it is ready I
share a picture of this installation)

I sometimes got the same error on the chelton (GPS NOT AVAILABLE/WAAS not
availible or EXTERNAL SENSOR ERROR (WSI)) but after flying 40plus hours
behind the cheltons I have to admit it is not a bad system at all. I have
flown with the Avidyne, Aspen and Garmin g900, but find the chelton in
some parts even easier. The only thing I do not like is the way to enter
flight plans in the system.

== Ronald
 

On 8/15/11 7:42 AM, "John Hafen" <j.hafen@comcast.net> wrote:

>This weekend, flying back to Seattle, directly over the Sawtooth
>mountains over Salmon Idaho, fat dumb and happy, on auto pilot at 16.5k
>feet in VFR conditions, I hear in my headset, "GPS Unavailable," after
>which my moving map Chelton re-boots itself, turning white, then black,
>then black with text, then it finally re-boots itself with all of the
>information except the ground map representation, which returned after a
>few minutes.
>
>It was nice to be able to refer to my iPad on my lap for navigation
>backup.
>
>It wasn't really  a panic because I was at altitude and in VFR, but it
>would have been a panic if I had been on an IFR departure out of Seattle,
>like I had two times earlier that week, where the overcast starts hard at
>500 feet and goes up to 8,500 feet.  If I had been in that position and
>had Seattle Center telling me to go to a particular intersection (Like
>SUMMA with two M's on the J5 south out of Seattle) and couldn't find the
>intersection because my Chelton decided to re-boot right then.......
>Now THAT my friends could have been a distraction.
>
>So I love the EFIS and use the heck out of it, and it's anything but
>bullet proof.  Why mine rebooted for no reason what-so-ever, right when
>it did, over the Sawtooths, I do not know.
>
>Glad it didn't happen on climb out out of Seattle in the muck.
>
>John Hafen
>IVP N413AJ 320 hours
>
>
>On Aug 8, 2011, at 7:40 PM, Brent Regan wrote:
>
>When we create the conformal document set (drawings, specifications,
>etc.) for certified hardware we try to lock down every aspect of the
>design so that vendors do not "improve" a component and cause an
>unforeseen problem. One man's improvement can be another man's nightmare.
>Case in point.
>
>A friend with a Chelton  IDU-I  manufactured about 10 years ago (by
>Sierra Flight Systems in Boise) was having a problem where the display
>would intermittently lose vertical synchronization and start flipping. I
>disassembled the unit to find the problem. It seems the LCD display
>vendor, Panelview, who also added the Anti Reflection (AR) coating,
>decided to add a metalized sticker to the display. Seems innocent enough,
>right? Well, with time and temperature cycles the sticker started to peal
>and came in contact with the backside of an inter-board connector that
>happened to be carrying the V-SYNC signal. With heat and vibration the
>aluminum layer of the sticker was exposed and shorted the signal pins.
>The attached pictures clearly show where the pins rubbed on the sticker.
>
>A freaking sticker?!?!?! Really?!?!?! That is one for the books.
>
>It is not the known knowns that get you. It is rarely the known unknowns
>that get you. It is the unknown unknowns that get you.
>
>It is experiences like this that are the basis for my advice that,
>despite your best efforts, sooner or later it may all go very wrong. And
>not for a big obvious reason but for a stupid little tiny sticker of a
>reason. Ask your self now, in the comfort of your office chair, what is
>your plan for when it does go very wrong?
>
>Regards
>Brent Regan
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