An Air Canada Airbus A330-300, registration C-GFAH performing flight AC-878 (dep Nov 24th) from Toronto,ON (Canada) to Zurich (Switzerland) with 275 passengers and 11 crew, landed on Zurich’s runway 14 however suffered the loss of nose wheel steering during roll out. The crew was unable to steer the aircraft off the runway, the aircraft needed to be towed off the runway.
Canada’s TSB reported maintenance replaced the hydraulic block, functional and leak tests revealed no further fault.
A hydraulic block can be caused by particles of anything building up in the fluid and causing a blockage in the cables. This can affect many of the aircraft systems, including the landing gear, flaps, brakes, some flight controls, spoilers, thrust reverses and many more systems.