An Air Canada A320 made an emergency landing last Thursday due to a hydraulic(?) failure. Fourteen ambulances were lined up as well as a few police cars and numerous fire trucks along the runway.
Apparently the nose-wheel couldn't turn, is this a hydraulic failure? The plane thankfully made a very very smooth landing with no incident and was towed to its gate.
On Sunday, an Air Canada A321 was taxiing out for departure when it lost all steering in its nose-wheel and stopped a few feet short of the grass off the taxiway.
I'm no mechanic, can somone explain to me why these two incidents happened?