Captain Asseline also reported that the engines didn't respond to his throttle input as he attempted to increase power. In the month prior to the accident, Airbus had posted two Operational Engineering Bulletins (OEBs) indicating anomalous behavior in the A320 aircraft. These bulletins were received by Air France, but were not sent out to pilots until after the accident.
OEB 19/1: Engine Acceleration Deficiency at Low Altitude
This OEB noted that the engines may not respond to throttle input at low altitude.
OEB 06/2: Baro-Setting Cross Check
This OEB stated that the barometric altitude indication on the A320 did not always function properly.
These malfunctions could have caused both the lack of power when the throttle was increased, and the inability of the crew to recognize the sharp sink rate as the plane passed 100 feet into the trees.
Flight recorders: In May of 1998, the Lausanne Institute of Police Forensic Evidence and Criminology (IPSC) determined that the recorders presented to the Court were not the ones taken from the aircraft after the accident.[3]