Date:         21 Oct 96 02:51:36 
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In article <airliners.1996.2015@ohare.Chicago.COM>, (Charles
Platt) writes:

>By this argument, double or triple redundancy in instruments or control
>systems should also be removed, since the more electronics or the more
>hydraulic lines you have, the greater the chance there is for one of them
>to fail.

Quite right in a sense and this philosophy is applied in satellite design as
I found out in a brief period of involvement with the space side of aerospace
working on spaceplanes. On a satellite where there's no opportunity for
maintenance,  the systems are often simplex, but designed to be ultra ultra
reliable. Minimises weight and maximises reliability.

Its also a fair point in respect of VSTOL aircraft, since its extremely
difficult to protect against engine failure in the vertical phase (ref
Harrier/AV8). Therefore better to only have onte engine.

Gerald Wilson