Assuming this is correct; due to the design of the 777 MLG, any jacking that was high enough would re-distribute the weight from a 6-point loading to a 3 point loading (two wheels and single jack point). This would place additional loads upon the two tyres and cause increased bending loads on the truck beam.
What happens if the plane is fully loaded at the terminal and the pilot does a last minute walk-around and decides he wants a MLG tire changed? Do passengers and cargo need to be off-loaded?
Photo © Belpix - AirTeamImages
[Edited 2006-10-21 04:40:34]