>I like both systems. I've heard of several guys who have had these systems
>and had problems with them getting whacked(technical term) when they start
>the engine from surges and EMI. I would recommend a avionics saver unit
>from Control Vision.(<http://www.controlvision.com>. This unit will protect
>delicate engine and avionic instruments from surges and automatically turn
>off engine instruments and avionics when the starter is engaged.
>I'm sure there are other ways to do this also but the unit is so cheap that
>I don't think it's worth the time to do anything else.
Folks, IF you are considering ANY device for your project that
has the slightest hint of history for being "whacked" or anything
else when installed in an otherwise normally operating airplane,
you'd better check with the manufacturer of the device before
you buy it. ASK, "Will your product meet or exceed all the
requirements set forth in RTCA DO-160, Power Input conditions
described in sections 16.0 through 20.0"
Building products that meet these requirements is a piece of
cake . . . I've been doing it for over 25 years. There's
no excuse for anyone to bring a product into the marketplace
that does NOT meet these requirements.
"Delicate engine and avionic instruments" is a term that should
be erased from the lexicon of airplanespeak . . . yes, I know
there are plenty of folks out there who depend on fears and
ignorance of the common folk in order to enhance the sales
of their products. It works VERY well in the world of type
certificated aircraft . . . even some degreed engineers
at airplane plants still preach the gospel of "better safe
than sorry."
But please, Please, PLEASE don't propogate stories
that invariably begin with, "I've heard of several guys
who have had . . . " If anyone has a real name of a victim,
and a product that failed to pass muster in his airplane
I'd sincerely like to know name, rank and serial number
of all parties and parts involved. I'll contact them and
offer gratis services to identify the failure mode and
offer ways to prevent it from happening again either by
appropriate (and generally rudimentary changes to the
electrical system) -OR- help the manufacturer with the
relatively trivial task of hardening their product.
Over the past 10 years, several dozen leads on "whacked",
"fried" and "smoked" componts have failed to yield any real
cases of design deficiencies . . in fact, of all the
situations I've tried to identify, only two turned out
to be real failures and both were induced by wiring
errors during installation.
You guys are building the best airplanes ever. Our
collective skills can only get better if we extract
ourselves out of the muck and mire of federally
decreed ignorance that plagues our brothers who fly
the heavy iron.
Bob . . .
////
(o o)
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