<<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
          <<  Lancair Builders' Mail List  >>
          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
>>
Diodes most frequently fail in the shorted rather than the open condition.
Some time ago in the Lanciar Network News, George Stevenson reported a
primary battery explosion due to an alternator over voltage.  His secondary
battery kept the electronic ignitions going but due to the fried isolation
diode the secibdary battery also tried to run everything else including the
hydraulic pump.  He did a fine job in recognizing the problem and took the
appropriate steps which included a emergency gear extension and immediate
landing.  The secondary battery was probably minutes from being ehausted
which would have resulted in an engine stoppage in addition to the cockpit
smoke and many other problems George was dealing with.

I like the idea of an essential bus that can be isolated from all the non
essentials with a mechanical switch that closes/opens a relay.  I will send
Marve my three bus electrical system for inclusion in the LNN after
Oshkosh.  I too am a Bob N. student and like Bob's approach to aircraft
electrical design.

Jim Frantz
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>