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Shutting an Alternator off

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jmjones2000(at)mindspring
Guest

Posted: Tue Apr 07, 2015 10:03 am Post subject: Shutting an Alternator off

Some Maules have a placard in the aircraft that say not to shut the alternator off in flight except in case of emergency.  Any idea why this is so?  Can shutting an alternator down in fight cause damage to the electrical system?

Thanks



Justin

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nuckolls.bob(at)aeroelect
Guest

Posted: Tue Apr 07, 2015 10:26 am Post subject: Shutting an Alternator off

At 12:58 2015-04-07, you wrote:

 	  Quote: 	
		  

<jmjones2000(at)mindspring.com>



Some Maules have a placard in the aircraft that say not to shut the 

alternator off in flight except in case of emergency.  Any idea why 

this is so?  Can shutting an alternator down in fight cause damage 

to the electrical system?


	


    I've spent hundreds of hours in airplanes and on

    test stands flipping switches and cranking knobs

    on various combinations of engine driven power sources,

    batteries and electrical loads. Not once have I

    had any worries about turning the alternator on/off

    while in operation.



    Some years ago, a common aviation hangar-myth migrated

    onto the List: "Turning an alternator on/off while

    in service (1) subjects the alternator or engine drive

    pads to deleterious stresses or (2) generates radio

    killing transients on the bus."



    This myth persists in many factions of the industry

    including notions that (a) avionics master switches

    erect a good and useful firewall against damage to

    radios, (b) a dead battery paralleled with a charged

    battery will discharge the good battery, (c) and

    numerous others.



   Bob . . .

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