On 1 June 2009 , Air France Flight 447 , an Airbus A330 en route from Rio de Janeiro to Paris , crashed in the Atlantic Ocean after transmitting automated messages indicating faults with various equipment , including the ADIRU . While examining possibly related events of weather-related loss of ADIRS , the NTSB decided to investigate two similar cases on cruising A330s . On a 21 May 2009 Miami-Sao Paulo TAM Flight 8091 registered as PT-MVB , and on a 23 June 2009 Hong Kong-Tokyo Northwest Airlines Flight 8 registered as N805NW each saw sudden loss of airspeed data at cruise altitude and consequent loss of ADIRS control
Flight 447
Air France Flight 447
Air data inertial reference unit