Redundancy

[Bill Glaze]

Ron:
Two elevator servos is probably a wise choice.  I have 2 elevator servos 
on my Extra 300, and had a neutral failure on one some time ago.  It 
sure seemed sluggish on elevator!  Decided to land and check it out.  No 
big deal, instead of taking it home in a sack  Bill Glaze.

Ron Van Putte wrote:

> There's been a lot of discussion about using two battery packs to 
> provide extra capacity and redundancy.  However, as Dean Pappas 
> mentioned earlier, most battery packs fail shorted, so they still 
> provide energy, albeit at reduced voltage and with limited current.  
> However, I have seen many servos fail and their failure mode is 
> usually "dead at neutral" or "dead hard over".  Neither of these modes 
> of failure is particularly conducive to airplane well being.  Most of 
> us use two aileron servos and having two aileron servos saved two 
> different airplanes of mine.  One servo failed "dead at neutral" and 
> the other "dead hard over".  The first was not a problem.  The second 
> was a struggle, but I got it on the ground safely.  After the second 
> servo failure on aileron, I started using dual elevator servos on all 
> my airplanes.  I haven't had a servo fail on elevator yet, but, if one 
> does, I'll have a fighting chance to get the airplane back on the 
> ground safely.
>
> Ron Van Putte
>
>
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