Was installing an aircraft tire the other day and checked the psi on it prior to the install and it was a bit high, was going to bleed off some of the pressure until my coworker informed me the psi will drop a bit once installed on the aircraft. In my mind I expected if you add the weight of the aircraft pressing down on the tire that it will increase the pressure inside of the tire but sure enough I checked it afterwards and it was back within limits. What am i missing here? The tires are filled with nitrogen but wouldnt that be irrelevant as it’s still occupying the same volume?
In: Physics
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Interesting. No idea but I’d be curious if you were to remove it from the aircraft and remeasure, would it still be high, or now low.
Increasing the weight of the aircraft deforms the tire. Makes the cross section of the tire more circular, which increases the volume of the tire. Increased volume means lower psi.
However, I wouldn’t think this deformation would be enough to change the psi that much. However, you should always check tire pressure fully loaded.
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