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Bob Barrow
Joined: 11 Jan 2006
Posts: 29
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 Posted: Fri Jun 22, 2007 3:25 am Post subject: Internal reg failed. Everything fried |
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The following copy of a post on the Yahoo GRT_EFIS group site is most
interesting. It seems the internal regulator on a Vans supplied alternator
failed on an RV and the resultant overvoltage fried all of the avionics.
FOR THE WHAT ITS WORTH COLUMN. WE HAVE HAD THE GRT EFIS AND EIS
INSTALLED IN AN RV9A AND HAVE NOTHING BUT GOOD THINGS TO SAY ABOUT
THE COMPANY, THE PEOPLE AND THE EQUIPMENT.
WE HAD OVER 300 HRS ON THE GRT EQUIP AND WE WERE FLYING FROM TYLER
TEXAS TO VICKSBURG MISSISSIPPI WHEN OUR ALT (FROM VANS FIREWALL
FORWARD PACKAGE) TOSSED ITS INTERNAL VOLTAGE REGULATOR INTO THE
ARMATURE. THE RESULT WAS THAT EVERTYING FRIED.
AS YOU ALL PROBABLY KNOW , AN OVERVOLTAGE IS NOT PROTECTED BY
BREAKERS. OUR SL30, 327 AUTO PILOTS AND .....EVERYTHING FRIED.
WE SENT OUR COOKED EFIS, AND EIS TO GRT AND TOLD THEM THAT IT WAS
NOT THEIR EQUIPMENT THAT FAILED BUT RATHER THE ABOVE,,,, THEIR
RESPONSE.... THEY SENT US NEW ONES ? IT IS RARE TO FIND A COMPANY
WITH THAT MUCH EXPERTISE AND ... HOW DO YOU DESCRIBE THAT KIND OF
SERVICE? GOOD WILL?
FRED HOLLOWAY
_________________________________________________________________
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nuckollsr(at)cox.net
Guest
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| Posted: Fri Jun 22, 2007 5:51 am Post subject: Internal reg failed. Everything fried |
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. . . any student of the assemblage of simple-ideas that
form a useful invention ultimately comes to understand
that the risk for such events is never zero . . . and the
$time$ to achieve 1x10^-6 reliability is great.
So, the cost effective approach hangs a hat on a parallel
concept . . . failure tolerance.
Assuming we know nothing about the pedigree of the simple-
ideas and cooks that crafted any particular alternator, the
prudent system designer simply assumes that the alternator can
and will fail in ugly ways at some point in time.
The traditional approach to making that failure tolerable
is to (1) fit the system with a means by which the pilot
exercises absolute control, (2) fit the system with active
notification of malfunction and (3) install an automatic,
milliseconds fast responder to the OV event that exercises
feature (1) which causes feature (2) to announce that the
alternator is off line . . . for whatever reason.
In terms of SYSTEM reliability, one can easily deduce that
the likelihood of a failure in the alternator and in either
(1), (2) or (3) happening together on the same tank full of
fuel is exceedingly small. Now if one has a well considered
plan-b for the unexpected alternator shut-down event, then
the builder has crafted great SYSTEM reliability from
a collection of components for which there is little or no
data as to the reliability of any one component.
The anecdote cited has no "hard evidence" by virtue of
an autopsy of the alleged failure but the byproducts of
that failure are inarguable and the source of the energy
that caused the damage is not debatable. This is an expensive
lesson that has taxed the $time$ of someone else . . . who has
seen fit to make us beneficiaries of his/her experience
and observations.
It would be foolish of us not to exploit that information
and apply the best-we-know-how-to-do as a prophylactic against
sharing the writer's experience. This ladies and gentlemen
is not a dark-n-stormy-night story that yields little
data for refining a recipe for success. It's a bright-light-
of-day-illumination of how a particular recipe failed
in expensive ways but fortunately without injury to the
"cooks".
Thank you Mr. Barrow for sharing this with us.
Bob . . .
At 09:23 PM 6/22/2007 +1000, you wrote:
| Quote: |
<bobbarrow10(at)hotmail.com>
The following copy of a post on the Yahoo GRT_EFIS group site is most
interesting. It seems the internal regulator on a Vans supplied alternator
failed on an RV and the resultant overvoltage fried all of the avionics.
FOR THE WHAT ITS WORTH COLUMN. WE HAVE HAD THE GRT EFIS AND EIS
INSTALLED IN AN RV9A AND HAVE NOTHING BUT GOOD THINGS TO SAY ABOUT
THE COMPANY, THE PEOPLE AND THE EQUIPMENT.
WE HAD OVER 300 HRS ON THE GRT EQUIP AND WE WERE FLYING FROM TYLER
TEXAS TO VICKSBURG MISSISSIPPI WHEN OUR ALT (FROM VANS FIREWALL
FORWARD PACKAGE) TOSSED ITS INTERNAL VOLTAGE REGULATOR INTO THE
ARMATURE. THE RESULT WAS THAT EVERTYING FRIED.
AS YOU ALL PROBABLY KNOW , AN OVERVOLTAGE IS NOT PROTECTED BY
BREAKERS. OUR SL30, 327 AUTO PILOTS AND .....EVERYTHING FRIED.
WE SENT OUR COOKED EFIS, AND EIS TO GRT AND TOLD THEM THAT IT WAS
NOT THEIR EQUIPMENT THAT FAILED BUT RATHER THE ABOVE,,,, THEIR
RESPONSE.... THEY SENT US NEW ONES ? IT IS RARE TO FIND A COMPANY
WITH THAT MUCH EXPERTISE AND ... HOW DO YOU DESCRIBE THAT KIND OF
SERVICE? GOOD WILL?
FRED HOLLOWAY
|
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