According to the AFP and France24, an Air France pilots’ union will present a report to investigators this week blaming defective air speed probes for the crash of Air France Flight 447 over the Atlantic.

The pilots’ report contradicts the findings of the French agency leading the investigation, the BEA, which has said that the speed monitors were a factor, but not the leading cause of the crash that left 228 people dead on June 1.

According to France’s Journal du Dimanche, the pilots’ union report primarily blames the plane’s manufacturer Airbus, Air France, civil aviation authorities and the European Aviation Safety Agency for neglecting problems with air speed sensors, also called pilot probes, which have been known to Airbus authorities since at least 2001.

Pilots say that if the appropriate measures have been taken, the crash “would have probably been avoided.”