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glcasey(at)adelphia.net
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 Posted: Sun Sep 24, 2006 5:14 am Post subject: Avionics bus |
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I had my panel "professionally" wired and the result was slightly
different than I had specified - probably just as much my fault as
theirs as I didn't supervise as closely as I should have. The panel
has a Chelton Primary Flight Display (PFD) which includes a (VFR) GPS
as well as a conventional radio stack, including both nav/coms,
transponder, GPS and autopilot, powered by a separate "avionics"
bus. It has 1 battery and 1 alternator. I had asked for an E-bus so
that one of the com radios would be powered by the main bus and only
essential radios off the E-bus. I ended up wiring it so that the PFD
is powered from the battery through the main contactor and the
"avionics bus" is also powered directly from the battery through a
fusible link and an automotive DIN relay. Works just fine and the
backup in case the main bus goes away is no problem as all avionics
and vacuum-powered gyros would still be functional. If the avionics
bus goes away I lose both coms, but still have GPS navigation
capability. I could carry a hand-held com (I lost mine - anyone seen
it....?). Right now my thought is just to leave it the way it is.
Any comments?
Gary Casey
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nuckollsr(at)cox.net
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| Posted: Sun Sep 24, 2006 6:08 pm Post subject: Avionics bus |
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At 06:13 AM 9/24/2006 -0700, you wrote:
| Quote: |
I had my panel "professionally" wired and the result was slightly
different than I had specified - probably just as much my fault as
theirs as I didn't supervise as closely as I should have. The panel
has a Chelton Primary Flight Display (PFD) which includes a (VFR) GPS
as well as a conventional radio stack, including both nav/coms,
transponder, GPS and autopilot, powered by a separate "avionics"
bus. It has 1 battery and 1 alternator. I had asked for an E-bus so
that one of the com radios would be powered by the main bus and only
essential radios off the E-bus. I ended up wiring it so that the PFD
is powered from the battery through the main contactor and the
"avionics bus" is also powered directly from the battery through a
fusible link and an automotive DIN relay. Works just fine and the
backup in case the main bus goes away is no problem as all avionics
and vacuum-powered gyros would still be functional. If the avionics
bus goes away I lose both coms, but still have GPS navigation
capability. I could carry a hand-held com (I lost mine - anyone seen
it....?). Right now my thought is just to leave it the way it is.
Any comments?
|
Hard to say . . . it's all dependent on how
strongly you're oriented to achieving your
design goals. Keep in mind that the main bus
doesn't "go away" . . . it simply becomes too
much stuff to operate for extended periods of
time battery only.
The simplest thing to do is run it as-built
and treat it like a TC aircraft . . . carry
hand-held backups.
I'd be careful about and "band aids" in an
attempt to dual feed the avionics bus. You should
have a diode in series with your avionics master so
that you don't back-feed the main bus from a battery
fed avionics bus. Also, fusible links are not
crash-safety oriented devices. Use a real fuse.
Bob . . .
---------------------------------------------------------
< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
---------------------------------------------------------
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trigo(at)mail.telepac.pt
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| Posted: Mon Sep 25, 2006 1:54 am Post subject: Avionics bus |
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>
| Quote: | The simplest thing to do is run it as-built
and treat it like a TC aircraft . . . carry
hand-held backups.
|
What does TC aircraft mean?
[quote][b]
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nuckollsr(at)cox.net
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| Posted: Mon Sep 25, 2006 4:35 am Post subject: Avionics bus |
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At 10:48 AM 9/25/2006 +0100, you wrote:
| Quote: | >
> The simplest thing to do is run it as-built
> and treat it like a TC aircraft . . . carry
> hand-held backups.
>
What does TC aircraft mean?
|
Type Certificated (alias SpamCan)
Bob. . .
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khorton01(at)rogers.com
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| Posted: Mon Sep 25, 2006 4:47 am Post subject: Avionics bus |
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On 25 Sep 2006, at 05:48, Carlos Trigo wrote:
| Quote: | > > The simplest thing to do is run it as-built> and treat it like a TC aircraft . . . carry> hand-held backups.>
What does TC aircraft mean?
|
Type-certificated, like production Cessnas, Pipers, etc.
Kevin Horton
Ottawa, Canada
[quote][b]
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