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Author Topic: "Power lines" warning  (Read 2227 times)
jrdioko
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« on: April 09, 2011, 08:27:58 PM »

During a flight lesson today, on frequency we heard a brief warning siren, then a recorded voice saying "Power lines" several times. What was that?
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StuSEL
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« Reply #1 on: April 09, 2011, 08:42:02 PM »

What were you flying?
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CFI ASEL
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jrdioko
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« Reply #2 on: April 09, 2011, 08:55:12 PM »

A Cessna, the recording was on whatever frequency we were on (tower, I believe). I looked back at the recordings and couldn't find it.
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MikeNYC
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« Reply #3 on: April 09, 2011, 09:41:57 PM »

Jrdioko,

Where are you located? There are automated systems in certain parts of the world to alert aircraft to wind turbine farms, aerial tramway cables, and power lines. You can find more information here:

https://www.pprune.org/archive/index.php/t-341173.html
http://ocas-as.no/solutions_2/power_lines/
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jrdioko
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« Reply #4 on: April 09, 2011, 09:45:36 PM »

Interesting. Hayward, California.
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NoMad
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« Reply #5 on: April 10, 2011, 10:47:49 AM »


The transmission tower on the approach path (presumably) has a receiver that picks up the aircraft's transponder reply so it knows there is a nearby aircraft.  It is a ~ 1/2 watt transmitter on the appropriate comm channel that makes that audible warning.  So it only transmits when there is an A/C nearby and at very low power so only the nearby A/C hear it.
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