From: "Marvin Kaye" <marv@lancaironline.net>
Subject: Re: [LML] Re: Brent's Reply (Of Men and EFIS)
To: lml
Date: Thu, 16 Oct 2003 16:49:05 -0400
Message-ID: <web-2639563@logan.com>
In-Reply-To: <52548863F8A5D411B530005004759A93747271@QBERT>
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Posted for George Braly <gwbraly@gami.com>:

  
         Brian,
  
     "...how likely are we to see conditions you test for..."
  
     Brian,  the DO-160D testing can reveal a lot of problems that are in
fact real world problems.   Yes... there are some things in there that are
un-realistic  (18 gHz at 200volts/meter) but there is a lot that is
significant for people in simple airplanes.
  
     For example, on a recent circuit board design,  we put the board on the
shaker table - - and at very modest levels of vibration, found a resonant
frequency and manageed to pop a power supply filter  off the board in about
10 seconds.  A single re-design and we fixed that problem. 
  
     You really don't want that to happen on a dark and rainy night when you
happen to park the RPM at 2373.5 RPM for a few seconds. 
  
     Regards,  George