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From: "Dennis O'Connor"
Subject: Re: (Avionics) How can this circuit produce an "inductive surge"?
Date: Thu, 26 Sep 2002 15:17:50 -0400
Organization: Posted via Supernews, http://www.supernews.com
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
Yes... Common knowledge is commonly wrong... The alternator cannot run away
during engine cranking and fry the electronics... Leaving the radios on
during engine start up and shut down involves no more risk of overvoltage
than at any other time or point in flight...
Unfortunately those who know the very least, rant and rave the loudest about
the 'danger of frying your electronics'... As you astutely point out,
aircraft generator/alternator circuits are clones of automobiles and with
millions of autos being started daily, they rarely fry the radio...
Strongly urge that you do a web search on NUCHOLLS and AEROELECTRIC... Lots
of good and accurate information...
"Peter" wrote in message
> The normal procedure in light airfraft startup/shutdown is to have all
> possible avionics disconnected when the engine is being started or
> Moreover, one is normally advised to have the alternator field circuit
> broken at these times (there is a switch for this purpose).
> There are many stories going around of somebody's entire avionics kit
> getting blown up if this procedure is not followed.
> Can anyone offer any clearly reasoned comments on this scenario?
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