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From: Richard Lamb
X-Mailer: Mozilla 4.72 [en]C-CCK-MCD NSCPCD472 (Win95; U)
Subject: Re: (Avionics) How can this circuit produce an "inductive surge"?
NNTP-Posting-Date: Fri, 27 Sep 2002 22:03:54 EDT
Organization: Prodigy Internet http://www.prodigy.com
Date: Sat, 28 Sep 2002 02:03:54 GMT
Peter is right, at least as far as aircraft asr concerned.
There is a relay that drops power to the avionics buss when
the starter is engaged. Avionics power is via the normally
Peter Gottlieb wrote:
> Many cars shut off all "accessory" loads during start. There are two good
> reasons I can think of for this:
> 1) Reduces battery drain during cranking to maximize cranking speed.
> 2) Reduces chances of damaging spikes getting to sensitive electronics.
> "Tarver Engineering" wrote in message
> > "Dennis O'Connor" wrote in message
> > news:firstname.lastname@example.org...
> > > 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
> > > than at any other time or point in flight... on
> > a
> > > small battery at a critical time>
> > In fact, all three electronic dash automobiles I have owned switch out
> > "avionics" when starting.
> > John
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