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Electrical surges in aircraft power supplies.

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed Mar 24, 2010 10:20 am Post subject: Electrical surges in aircraft power supplies.

At 05:16 AM 3/24/2010, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "LINDA WALKER" <l.p(at)talk21.com>



 Bob et al.

 I have been able to get my BMA Efis G4 Lite repaired.

 The fault may have been caused by a surge in the power supply line.

 Is there an accepted method to catch surges in our type of electrical

 systems?

 Any help much appreciated.

 Patrick C Elliott, England.

 Long-EZ, G-LGEZ. 	


     "Our type of electrical system" is no different than

     the one on automobiles. Designers of sophisticated

     electronics for automobiles and airplanes have been

     well aware of the characteristics of these DC power

     systems for decades. Design rules for crafting accessories

     compatible with such systems have also been well

     established for decades.



     Failure of any modern accessory (and BMA is certainly

     modern) attributed to power "surges, glitches, spikes,

     or gremlins" is a stronger suggestion of design deficiency

     in that accessory than for the DC power system. See:



  http://tinyurl.com/ybhvxal 



     Bottom line is that any device designed after about

     1970 to go into airplanes has been immune to the

     NORMAL operating characteristics of DC power systems

     by design. If the repair technician makes any 

     assertion about your device having suffered a "glitch"

     is essentially accusing the device manufacture of not

     having done their homework.



     Bob . . .

     [quote][b]

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marcausman

Joined: 08 Feb 2007
Posts: 70

Posted: Wed Mar 24, 2010 6:57 pm Post subject: Re: Electrical surges in aircraft power supplies.

The DO-160E category specifications we've designed to state 40 volts for 1 second and 60 volts for 100ms, 10 to 32 volts normal operating range. This, along with other design considerations, has proven to be quite reliable.

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_________________
Marc Ausman
http://www.verticalpower.com "Move up to a modern electrical system"
RV-7 IO-390 Flying

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