[DannyTN]

"Maybe they were terrorists planning to sabotage the planes, only they didn't count on it being 40 degrees below zero at altitude."

That's it! They planned to throw themselves in front of the wheel when landing "tripping" the plane.

[Darksheare]

Screaming speedbumps and improvised brake pads?

[mvpel]

Severing hydraulic lines causing a landing gear deployment failure could have a deleterious effect.