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Eric M. Jones
Joined: 10 Jan 2006
Posts: 565
Location: Massachusetts
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 Posted: Mon Apr 23, 2012 5:58 am Post subject: Push to Test |
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| Quote: | Can someone point me in the direction of a '2 pole push switch' or a 'standard' 2 pole switch ie: OFF-ON(mom) - this is to enable me to have a single push to test switch, for both push to earth circuits, and push to
live circuits in one switch John |
Just a note: Using LEDs for indicators pretty much obviates the need for "push-to-test" switches that test only the lamp function. LEDs should last longer than the switch, the socket, the wiring or the airplane. So eliminate this function unless you are actually testing the entire function (which is usually quite impractical).
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_________________
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones(at)charter.net |
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sprocket(at)vx-aviation.c
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| Posted: Mon Apr 23, 2012 1:09 pm Post subject: Push to Test |
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Interesting that a thread over on Van's airforce involves removing the LEDs
from unreliable annunciators and replacing them with after market LEDs.
LEDs can fail if mis-applied or if they are part of some of the cheap junk
lamps sold online.
Eric has tweaked some opinions that I have, that I can distill into "a fools
guide to idiot lights":
Rule 1) Any system that measures must be more reliable than the system it is
measuring.
Rule 2) If rule 1 is violated, it will guarantee that an actual failure in
the underlying system will be ignored.
For example, I had a VDO fuel pressure sender fail on my RV-9A after 400
hours. After in flight diagnosis, I determined that both the mechanical and
electrical boost pumps were functioning properly, so I replaced the sender.
Replacing the sender fixed the problem. The next time I have a fuel
pressure alarm I will suspect the sender has failed again... which may not
be a correct assumption.
I'm sure someone else has a more clever way of saying this than me.
As for Eric's comments, they are spot-on...
--
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