Quote:
Originally Posted by secretone
On a separate topic, I have also read that some American control towers used light guns with green, red and white colors to communicate with aircraft that did not have radios.
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It seems this system is still in use. While browsing youtube I came across the following video about landing an aircraft with full electric failure. The tower uses such a colored light to instruct it(Even if it's not very visible on camera).
Edit: And an intructional video on the subject from my youtube suggestions: