Meaning of ATC flashing white signal

Capt. Geoffrey Thorpe said:
Are the lights battery powered so they could be used in the event of a power failure in the tower, or...?
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I would hope that towers have generator backup, but I don’t really know. Having multiple planes under tower control at the mercy of the local flicker-&-flash power company doesn’t seem wise.
 
mscard88 said:
Man, good question. I don't think ours were in the Air Force, never heard anything about batteries.
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During my tower visit, they showed me the gun, which runs on 18v battery and was rigged with stuff from Home Depot. They also have a sticker on both sides of the gun that explained what the signal means


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It's like a unicorn - you might see pictures, but not the real thing. . .
 
Here's where I think the idea of unicorns came from:

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Never test a fart...true for hippos too.

another red and green, use extreme caution.
 
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