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mprather(at)spro.net
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 Posted: Tue Jun 10, 2008 2:40 pm Post subject: Starting the REAL electrical work on my 601XL |
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| Quote: |
<wrgiacona(at)gmail.com>
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snip
| Quote: | firewall. They will be wired along with the ignition so that a single
switch switches both ignition system and fuel pumps.
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It's possible I don't clearly understand how you'll be wiring the fuel
pumps and ignition system(s).. But it sounds like you are saying that
there will be a single switch controlling everything. If so, I believe
this switch represents a single point of failure, which is generally
undesirable for flight critical electrical items - at least when it comes
to switches... If the switch falls apart, the engine could stop
running(?).
Regards,
Matt
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Gig Giacona
Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA
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| Posted: Wed Jun 11, 2008 7:57 am Post subject: Re: Starting the REAL electrical work on my 601XL |
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No, you are right that is a single point of failure and I'm not blowing you off on the issue but is has been discussed to death in other forums and it has become the standard method for the William Wynne Corvair conversion. Very quickly the theory is in the case of an engine failure there is generally going to be only to failure modes you can do anything about in the cockpit. One is the fuel system and one is the ignition system. With the single switch design you put in a fresh fuel pump and a fresh ignition system online. We do try to use the best Mil-Spec switch we can find to at least reduce the chance. The theory goes on that multiple switches introduces multiple single points of failure and while we hate them they are in every plane that ever flew and it also introduces switchology issues that have a greater chance of pilot error than does the single switch.
I agree the more equipment fault resistant method would be 4 switches one for each pump and one for each ignition. But in the case of an engine outage the pilot then has to run through multiple switch settings to figure out the problem.
It all comes down to the guy that designed the conversion came up with this method and there are a bunch of planes flying with it. I'm not tempted at this point to change it.
[quote="mprather(at)spro.net]
It's possible I don't clearly understand how you'll be wiring the fuel
pumps and ignition system(s).. But it sounds like you are saying that
there will be a single switch controlling everything. If so, I believe
this switch represents a single point of failure, which is generally
undesirable for flight critical electrical items - at least when it comes
to switches... If the switch falls apart, the engine could stop
running(?).
Matt[/quote]
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_________________
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR |
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