Air France had begun replacing the existing speed sensors on its Airbus A330 and A340 jet fleet with the Goodrich model.

The first six planes have been fitted with replaced sensors or pitots and the remaining will also be rapidly upgraded, AFP reports, quoting an Air France spokesperson.

The existing Thales Pitots are being replaced for 34 of Air France’s long-haul planes along with ten A330’s from sister firm KLM.

Airbus and the European Aviation Safety Agency have recently asked airlines to replace the speed monitors after two instances where the sensors malfunctioned including the Air France flight 447 that crashed into the Atlantic, killing 228 people.

France’s accident investigation agency, the BEA, has confirmed that the speed monitors on the flight 447 had given false airspeed data, a contributing factor, though not the cause of the crash.