There's been several posts of a 777 (and 747SP) crosswind landing
video .
Here's an amalgamated quote that describe the video:
"Boeing factory test pilots verifying the demonstrated crosswind landing limits on the 777 and the 747SP. The engineers make educated guesses, but then the test crews have to go actually prove the numbers.
The engineers design the landing gear system, goes up for a design review, gets manufactured, the maintenance people install it, ops check it, then jack and retract the system; but then Boeing test crews have to actually prove the design before the landing gear sideload limits gets etched in stone in the -1 flight manual.
So they sneak off to Brazil to do these tests at a certain remote BAF base famous for its continual atrocious crosswinds...
This is some good piloting by the test pilots in getting these planes down. For some people it looks totally unnatural for an aircraft that size doing that, and for others it's a thing of beauty.
If you haven't seen these it's pretty cool to watch planes of this size crabbing in on a landing. "