From article and TV report:
... The document (statement of claim) said it did not advise that in certain conditions, the plane's flight path angle could be affected by external forces.
It also claims Airbus failed to incorporate a warning system to alert pilots to a deviation from the planned flight path angle.
"(Airbus) failed to provide adequate and/or accurate information as to how pilots should correct a deviation in the flight path in circumstances where manual intervention was required," ...
... Air Canada's lawsuit against Airbus says the flight crew correctly configured the aircraft for landing, including entering the correct flight path angle into the flight computer.
"Since the aircraft was correctly configured for approach and landing and the approach was stable, the aircraft should have intercepted the threshold to runway 05 at an altitude of 50 feet," the claim said.
"Instead, the aircraft descended at a steeper angle than expected and touched down short of the runway."