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nuckollsr(at)cox.net
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 Posted: Wed Nov 08, 2006 6:07 am Post subject: PROBABLE SPAM> Re: Transorb voltage for 14V system |
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At 05:58 PM 11/6/2006 -0600, you wrote:
| Quote: |
<paul.mcallister(at)qia.net>
Bob et al.
Some time ago my aircraft took a lightning hit which damaged many electronic
devices, with the exception of the Apollo GX60 and SL70. Now I don't know
if this was because these are well designed products or they were just
having a lucky day, but my question, would a heavy duty transorb help in a
catastrophic even like this ?
Paul
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Yeah, I recall that. When we do DO-160 qualification for
the effects of lightning, there are a bunch of levels of test
stress presumably based on real world indirect effects (device
and associated wiring doesn't take stroke current) and direct
effects (device takes the hit . . . like your strobes).
The levels are adjusted depending on the material from
which the airplane is built and on the device's position
on the airplane. Obviously, direct effects to an antenna
stuck out the top is a stronger test value than for some
3-wire transducer hiding somewhere inside the engine
where only common mode indirect effects are expected.
For your case, you've got the highest/steepest hill to
climb for 'certifiable' resistance to lightning stroke.
In fact, under the current design rules, no plastic airplane
can be expected or tested to withstand much of anything in
terms of real-world effects of lightning.
The short answer to you question is, yeah we COULD design
an electrical system for your airplane that would have
a 95% chance of standing off a direct effects stroke but
the cost, weight and volume of the finished system would
probably be more than you'd want to consider . . . and it
would involve a whole lot more than sprinkling a few
Transorbs around the system.
Bob . . .
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rvbuilder(at)sausen.net
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| Posted: Wed Nov 08, 2006 7:47 am Post subject: PROBABLE SPAM> Re: Transorb voltage for 14V system |
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So that would be a maybe?
--
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