The NLG knocking noise heard on taxi-in to stand, what could cause this knocking noise?
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That's a pilot taxiing perfectly on the centerline, which makes one of the two nose landing gear tires hit all the taxiway centerline lights.
Just like the sound the tires of a car make when they hit the cat's eyes on a road at speed.
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1Based on the configuration of the 777's nose gear (image), I'd say the pilot was a bit off-center. – FreeMan Mar 06 '19 at 14:51