Oz Aviation Safety Investigation Report - Final.
Airbus A330-341, PK-GPC. 27 August 2001
200104399
The loss of valid radio altimeter signals did not result in the automatic switching from flight mode to flare mode when the autopilots disengaged. That was due to the water ingress into the radio altimeter antennas, and which resulted in the radio altimeter signals being interpreted as out of range signals, rather than as a failure of the radio altimeters.