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Question:

Question about airplane tires?

How often do they change airplane tires and why/what are they filled with?

Answer:

could be wrong. i heard about every 120 landings in a 737
Not often as required and as requested by the captain what I mean is example is it is punctured in the aircraft particular AMM it is written that tires with a puncture or cut with a depth of more than half an inch. must be replaced but the depth is just about 1/4 so it is still a go but the captain's ask you to replace it for he will do 4 legs so pilot's discretion will come first and you have to replace it.
Tires are replaced when the cords show, some tires allow up to 12 layers of nylon cords to show before requiring replacement. They are usually filled with nitrogen because it is resistant to temperature changes.

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