nuckolls.bob(at)cox.net
Guest
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 Posted: Fri Jul 18, 2008 7:50 am Post subject: Night VFR and Fuse/Breaker Accessibility |
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At 08:18 PM 7/17/2008 -0400, you wrote:
| Quote: | Good Evening Dennis,
Jut as a point of interest, the later Bonanzas have a whole passel of
fuses on the forward side of the firewall, They are quite obviously not
replaceable in flight!
Do Not Archive
Happy Skies,
Old Bob
AKA
Bob Siegfried
Ancient Aviator
628 West 86th Street
Downers Grove, IL 60516
630 985-8502
Stearman N3977A
Brookeridge Air Park LL22
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Yeah, take a peek at:
http://aeroelectric.com/Pictures/Wiring_Technique/Firewall_Ckt_Protection.jpg
Aside from the fact that the FARS have a very limited
influence on design and operation of the OBAM aircraft,
I'll suggest there is a simple, reliable approach to
complying with the spirit and intent of 91.205 . . .
We KNOW that there are countless ways that a useful
appliance can fail such that the fuse or breaker is never
tripped. In fact, 99.99+% of all breakers and fuses in
all kinds of vehicles run the lifetime of the vehicle
never having been called upon to do their job . . .
keep a wire from burning and keep a failure within
a single system from propagating into other systems
in the vehicle.
If there is ANY appliance bolted to your airplane
that you personally depend on for comfortable termination
of flight, then access to fuses and/or breakers contributes
NOTHING to probability of a comfortable termination of
flight. If a breaker or fuse opens, it's because there's
a failure downstream of the fuse that will only open the
fuse again if you take the time and suffer the distraction
to replace it. The other reason for a trip is that the
fuse/breaker is UNDERSIZED and needs to be fixed. On an
OBAM aircraft, no big deal. On a TC aircraft, big deal.
Having considered this, I'll suggest the road to Nirvana
is FAILURE TOLERANT design. For the few items you've put
on your list of real important things, you'd better have
a back up for those devices . . . PLAN B. Once plan-B
is implemented, criticality of all devices in the
airplane goes to zero . . . i.e, there are no single
failures that cause you to break a sweat before you
put the wheels back on the ground.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
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