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-   Tech Log (https://www.pprune.org/tech-log-15/)
-   -   Nav lights means aircraft electrically powered? (https://www.pprune.org/tech-log/581518-nav-lights-means-aircraft-electrically-powered.html)

spannersatcx 15th Jul 2016 15:53
Originally Posted by Goldenrivett (Post 9439568)
Might have been in the old days Dave, but many modern Aircraft NAV Lights are powered on the ground by an AC BUS (e.g. Ground Service BUS).

No more flat batteries because Nigel forgot to turn off the lights.
Goldenrivett, Some modern a/c have a towing bus that is powered by batteries and a switch, 747-8 and the A350 to name but 2!

ExMaintainer 16th Jul 2016 06:22
Fwiw, in the late 70's Nav lights on meant aircrew on aircraft and anti cols just before turning and burning. Probably all changed now.

NSEU 17th Jul 2016 10:23
Goldenrivett, Some modern a/c have a towing bus that is powered by batteries and a switch, 747-8 and the A350 to name but 2!
It's definitely an option on many aircraft.

Note that to power the nav lights, the towing bus requires an inverter to convert battery DC power to AC.

LimaFoxTango 17th Jul 2016 10:31
Note that to power the nav lights, the towing bus requires an inverter to convert battery DC power to AC.
Perhaps on jets nav lights are AC powered, but on turboprops, lights are usually DC powered. Most notably though on the ATR, landing/taxi lights are AC powered.


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