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rd2(at)evenlink.com
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 Posted: Wed Jan 25, 2006 6:37 am Post subject: AP signal source annunciator LEDs |
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Listers,
Does anyone know if there is a regulatory requirement or guidance re. auto
pilot signall source annunciator LEDs on production aircraft? We have an AP
wired to switch between 2 Navs and a LORAN/GPS and would like to add 3 LEDs
to indicate which source supplies the left/right signal. Planning to use 3
red panel-mount LED's with dimming switch for the purpose.
Rumen
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Bruce(at)glasair.org
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| Posted: Wed Jan 25, 2006 7:02 am Post subject: AP signal source annunciator LEDs |
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There's some nifty self annunciating push button switches out there, but
they're expensive. I see no reason why your low tech solution won't work.
There are annunciating requirements for the certified world but not for us.
Bruce
www.glasair.org
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nuckollsr(at)cox.net
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| Posted: Wed Jan 25, 2006 7:14 am Post subject: AP signal source annunciator LEDs |
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At 09:31 AM 1/25/2006 -0500, you wrote:
| Quote: |
Listers,
Does anyone know if there is a regulatory requirement or guidance re. auto
pilot signall source annunciator LEDs on production aircraft? We have an AP
wired to switch between 2 Navs and a LORAN/GPS and would like to add 3 LEDs
to indicate which source supplies the left/right signal. Planning to use 3
red panel-mount LED's with dimming switch for the purpose.
|
Don't know about "regulatory" . . . in the TC world and on
Part 23 aircraft, the nav source switch was generally installed
on the flight instrument panel or just below it so that switch
position was the "annunciation" for source of current nav data.
On our $bizjet$ the EFIS systems tells all things all the time.
If you're talking about an OBAM aircraft, do what ever makes
sense for you. For a TC aircraft, avoid red/green/amber which
have traditionally been reserved for warning/on/caution
annunciations. Blue, white, yellow, cyan, magenta would be
better selections for "informative" annunciations.
Bob . . .
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rd2(at)evenlink.com
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| Posted: Wed Jan 25, 2006 9:42 am Post subject: AP signal source annunciator LEDs |
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The AP already has a 3 position rotary switch with enough unused contacts
that can be used to supply power to the LEDs. And, unfortunately, it's
production aircraft.
Thanks for the feedback, Bruce.
Rumen
do not archive
_____________________Original message __________________________
(received from Bruce Gray; Date: 10:01 AM 1/25/2006
-0500)
There's some nifty self annunciating push button switches out there, but
they're expensive. I see no reason why your low tech solution won't work.
There are annunciating requirements for the certified world but not for us.
Bruce
www.glasair.org
--
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rd2(at)evenlink.com
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| Posted: Wed Jan 25, 2006 9:45 am Post subject: AP signal source annunciator LEDs |
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Thanks, Bob.
Will use blue or white LEDs (it's certified).
Rumen
do not archive
_____________________Original message __________________________
(received from Robert L. Nuckolls, III; Date: 09:10 AM
1/25/2006 -0600)
<nuckollsr(at)cox.net>
At 09:31 AM 1/25/2006 -0500, you wrote:
| Quote: |
Listers,
Does anyone know if there is a regulatory requirement or guidance re. auto
pilot signall source annunciator LEDs on production aircraft? We have an AP
wired to switch between 2 Navs and a LORAN/GPS and would like to add 3 LEDs
to indicate which source supplies the left/right signal. Planning to use 3
red panel-mount LED's with dimming switch for the purpose.
|
Don't know about "regulatory" . . . in the TC world and on
Part 23 aircraft, the nav source switch was generally installed
on the flight instrument panel or just below it so that switch
position was the "annunciation" for source of current nav data.
On our $bizjet$ the EFIS systems tells all things all the time.
If you're talking about an OBAM aircraft, do what ever makes
sense for you. For a TC aircraft, avoid red/green/amber which
have traditionally been reserved for warning/on/caution
annunciations. Blue, white, yellow, cyan, magenta would be
better selections for "informative" annunciations.
Bob . . .
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Bruce(at)glasair.org
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| Posted: Wed Jan 25, 2006 9:55 am Post subject: AP signal source annunciator LEDs |
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Well, you can always go the STC route (shudder).
Bruce
www.glasair.org
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