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10-16-2009, 11:46 AM
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Join Date: Jul 2007
Location: Petaluma California
Posts: 12
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ELT power?
Where in the "Aeroelectric Connection" world of wiring, would one find which buss or direct to battery, to run the Elt from? Assume that I'm using the E buss method w/ single battery/Alt. combo...
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Opa John 
RV-7A sold
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10-16-2009, 11:48 AM
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fugio ergo sum
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Join Date: Apr 2006
Location: Carlsbad, NM
Posts: 1,912
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Quote:
Originally Posted by Opa John
Where in the "Aeroelectric Connection" world of wiring, would one find which buss or direct to battery, to run the Elt from?...
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ELTs are always powered from their internal batteries.
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Larry Pardue
Carlsbad, NM
RV-6 N441LP Flying
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10-16-2009, 11:54 AM
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Join Date: Feb 2005
Location: Northwestern USA
Posts: 1,209
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Quote:
Originally Posted by n5lp
ELTs are always powered from their internal batteries.
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...unless you have one of the fancy new 406 MHz ELTs with a GPS serial input. All the ones I've seen need a power input to run the serial adapter, although the actual ELT itself is still powered by its own batteries.
mcb
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Matt Burch
RV-7 (last 90%)
http://www.rv7blog.com
VAF #836
Any opinions expressed in this message are my own and not those of my employer.
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10-16-2009, 11:57 AM
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Join Date: Jul 2007
Location: Petaluma California
Posts: 12
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Um Duh
Quote:
Originally Posted by n5lp
ELTs are always powered from their internal batteries.
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Should have remembered that from "BASIC" Flight school...
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Opa John
RV-7A sold
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10-16-2009, 12:00 PM
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Join Date: Jul 2007
Location: Petaluma California
Posts: 12
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Quote:
Originally Posted by mburch
...unless you have one of the fancy new 406 MHz ELTs with a GPS serial input. All the ones I've seen need a power input to run the serial adapter, although the actual ELT itself is still powered by its own batteries.
mcb
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So with 406's would it be feasable to run it on the same buss as the gps? Bob normally has it on the E buss...
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Opa John
RV-7A sold
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10-16-2009, 12:49 PM
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Join Date: Jul 2009
Location: Wilsonville, OR
Posts: 453
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Your installation manual for the ELT should give the recommended bus. Most recommend connecting it to a fuse, directly to the battery. This would be similar to a chronometer with a Always-On wire.
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Trevor Conroy CFII, MEI
Airbus Pilot
N781TD
RV-7
First Flight - April 12, 2015
Construction Log
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10-16-2009, 01:23 PM
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fugio ergo sum
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Join Date: Apr 2006
Location: Carlsbad, NM
Posts: 1,912
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Quote:
Originally Posted by mburch
...unless you have one of the fancy new 406 MHz ELTs with a GPS serial input. All the ones I've seen need a power input to run the serial adapter, although the actual ELT itself is still powered by its own batteries.
mcb
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Aaagh! As soon as I wrote "always" I was reminded about the adage of always and never. I thought and thought though and couldn't think of an exception (sort of). Don't have experience with those new deals.
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Larry Pardue
Carlsbad, NM
RV-6 N441LP Flying
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10-16-2009, 01:43 PM
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Join Date: Jan 2005
Location: Roanoke, VA
Posts: 306
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Use the same fuse as the GPS...
Quote:
Originally Posted by Opa John
So with 406's would it be feasable to run it on the same buss as the gps? Bob normally has it on the E buss...
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It would make sense to power the GPS adapter from the same fuse that the GPS is powered from. If the fuse blows and you lose GPS data, you don't need an adapter.
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Dave Cole RV-7 N97DC reserved
dave.cole@cox.net
Started SB April 2004
Hope to fly in 2011
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10-16-2009, 01:47 PM
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Join Date: Feb 2005
Location: Northwestern USA
Posts: 1,209
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Quote:
Originally Posted by Dave Cole
It would make sense to power the GPS adapter from the same fuse that the GPS is powered from. If the fuse blows and you lose GPS data, you don't need an adapter.
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Not a bad idea. Similarly, in my airplane, I am powering the ELT's GPS adapter from the same fuse that my EFIS uses to sense bus voltage. That way the ELT fuse can't blow without me knowing about it.
mcb
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Matt Burch
RV-7 (last 90%)
http://www.rv7blog.com
VAF #836
Any opinions expressed in this message are my own and not those of my employer.
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