Originally Posted by
Efrem
They're called "aircraft landing lights" or ACLs, though they're also used on take-off for safety reasons and are supposed to be on whenever the aircraft is below 10,000 feet.
Thank you for your answer. My main question was why they were active in the middle of the flight at 30'000ft cruising altitude? ANd not just for some minutes. Or did the pilots some routine checks and forgot to turn them off?
W