pbesing(at)yahoo.com
Guest
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 Posted: Mon Dec 15, 2008 9:28 am Post subject: Redundancies |
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Good point, Linn. "will not fail" was the wrong choice of words while writing in haste (and being tired didn't help). I meant my point to be understood that the pilot and the builder/designer are the weak links most of the time. If one were to subscribe to Bob Knuckolls school of thought, a little redundancy goes a long way. But to over design a system with two electrical systems, vacuum, electric, and backups for the backups are getting a little crazy in some builder's airplanes. IMHO, that introduces more failure points and complexities than it does any good. Regarding the Beech AD, feeding all radios or multiple components are definitely NOT a good idea...single points of failures should be minimized.
Paul Besing
From: linn Walters <pitts_pilot(at)bellsouth.net>
To: rv-list(at)matronics.com
Sent: Sunday, December 14, 2008 10:19:36 PM
Subject: Re: Which is a good vacuum pump?
--> RV-List message posted by: linn Walters <pitts_pilot(at)bellsouth.net (pitts_pilot(at)bellsouth.net)>
Sorry folks, but I'm starting to enjoy this!
Kelly McMullen wrote:
| Quote: | --> RV-List message posted by: Kelly McMullen <kellym(at)aviating.com (kellym(at)aviating.com)>
It doesn't take a total failure. All you need is one little component to let out some electrical smoke in the cockpit while you are on the gauges and you will be faced with no electrics without risk of additional fire.
Actually, once the magic smoke gets loose, the only thing you lose is that little box.
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| Quote: | Argue all you want, or just make your choice. Just don't lead others blindly down the same risky path. I've seen too many electrical failures in 30+ years of flying and wrenching on planes to totally rely on electrics.
You may be a pretty good wrench, but I'm getting the feeling you don't know squat about "electrics".
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| Quote: | A number of Beechcraft are facing an AD right now to replace most of their circuit breakers that on rare occasion leak smoke. So there goes your "will not fail" argument.
Nobody said 'nothing will fail' ..... what they did say is that they have an 'alternate' to go to if a failure occurs. It's unfortunate, but the one component in the airplane that seems to fail more often than any other ...... is the pilot. I think there's more to the Beech AD than meets the eye ..... not knowing for sure, but I have the feeling there's a design problem in the breaker, and that Beech fed all the radios from one breaker. Older airplanes did that. If it was only a rare occasion, I don't think there would be an AD otherwise.
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Linn
pilot & airplane builder
do not archive
[quote] KM
A&P/IA
Paul [quote][b]
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