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Disposition-Notification-To: Brent Regan <brent@regandesigns.com>
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From: Brent Regan <brent@regandesigns.com>
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Subject: R: Of Men and EFIS
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Shannnon writes:

<<Since when does CFS recommend that I can have my experimental IDU on
when cranking?  I've been told over and over this is a no no?  Obviously
it disappointed me (as it did Bob Nuckols), but I dealt with it.  Are
you telling me this is no longer an issue? >>

They don't. There is a difference between "Cant be on during cranking" 
and "we do not recommend having it on during cranking". As an engineer I 
am interested in the equipment's capabilities but the manufacturers 
recommendations may follow convention and be more conservative. Im my 28 
volt airplane there is no avionics buss switch so all my avionics, 
including the EFIS, are on during cranking. If I had built a 12 volt 
airplane then I probably would have included an avionics switch to 
reduce the load on the battery during cranking.

Experience and testing show that the EFIS will ride through or reboot 
and function properly after a brown out.

YOU are obliged to follow the manufacturers recommendations, unless you 
are an idiot like me.

Regards
Brent Regan