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JOHN TIPTON
Joined: 17 Sep 2006
Posts: 239
Location: Torquay - England
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 Posted: Mon Jun 13, 2016 6:44 am Post subject: If you really want a avionics switch - do it this way |
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Hi Bob (et all)
I've been thinking of using this system (RV9a)
http://www.aeroelectric.com/articles/avmaster.pdf
for a avionics switch - would it be 'acceptable' to use a two pole, changeover (2-10) switch, as neither circuit would/should be on together, so: centre all off, switch up, avionics live, switch down, endurance bus feed live
Regards - John
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user9253
Joined: 28 Mar 2008
Posts: 1938
Location: Riley TWP Michigan
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| Posted: Mon Jun 13, 2016 10:33 am Post subject: Re: If you really want a avionics switch - do it this way |
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The 2-10 switch functions are:
Down: Both OFF
Center: One circuit ON
UP: Both circuits ON
The S700-2-1 switch functions are as you posted:
Down: One circuit ON
Center: Both OFF
UP: The other circuit ON
The S700-2-1 nomenclature is only used by B&C. If purchased elsewhere, it is called a DPDT switch with center off.
If a switch description contains ( ) , that indicates a momentary position.
The disadvantages of having a switch in series with the diode are that the switch adds complexity and can fail. If there is no switch, it can not fail.
There may be rare occasions when it is desired to shut off all avionics. But it is better to shut off each one individually, because switches need exercising to rub off oxidation. Aircraft switches are more likely to fail from corroded contacts than from mechanical failure (wearing out).
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Joe Gores |
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cluros(at)gmail.com
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| Posted: Tue Jun 14, 2016 3:09 am Post subject: If you really want a avionics switch - do it this way |
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Hi John
I have seen many of these good switches fail mechanically in commercial aircraft. Don't forget that any of the switches in that 172 that had manufacturing defects and died early were replaced after they failed.
Sebastien
| Quote: | On Jun 14, 2016, at 05:19, JOHN TIPTON <jmtipton(at)btopenworld.com> wrote:
Hi Bob
I know what you are saying about single point of failure, but a two pole swtich, with both sides failing, I fly a forty plus year old C172 (keeps me current while I build the RV) has switches which are very 'wobbly' and I presume they are original, but still doing their job - A good MS (Hamilton) switch should have some longevity built in I hope
Regards: John
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=457111#457111
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