WASHINGTON -LRB- CNN -RRB- -- United States accident investigators are probing two recent failures of airspeed and altitude indications aboard Airbus A330s -- the same type of plane that crashed into the Atlantic nearly a month ago . Investigators are looking into incidents aboard two other Airbus A330s . The planes landed safely and there were no injuries or damage , the National Transportation Safety Board said Thursday . One flight was between the United States and Brazil in May and the other between Hong Kong and Japan in June . The probes were launched in the aftermath of the June 1 crash in the Atlantic Ocean -- when Air France Flight 447 was flying to Paris , France , from Rio de Janeiro , Brazil . All 228 people on board the plane , an A330 , were killed . Investigators are looking at the possible role of airspeed sensors known as pitot tubes , among other factors , as a possible cause of the Flight 447 crash . That flight sent 24 automated error messages in the four minutes before it crashed , the head of the French accident investigation board , Paul-Louis Arslanian , has said . The error messages all indicate there were problems with on-board information about the plane 's speed , which can cause some of the plane 's instruments to stop functioning , Arslanian said . Search teams are looking for the bulk of the plane 's wreckage and for its flight data recorders . The first of the two incidents being investigated by the NTSB happened May 21 , when a TAM Airlines flight from Miami , Florida , to Sao Paulo , Brazil , experienced a loss of primary speed and altitude information while in flight , the NTSB said . `` Initial reports indicate that the flight crew noted an abrupt drop in indicated outside air temperature , followed by the loss of the Air Data Reference System and disconnections of the autopilot and autothrust , along with the loss of speed and altitude information , '' the NTSB said . The flight crew used backup instruments and the primary data was restored in about five minutes , the NTSB said . Another `` possibly similar '' incident happened June 23 on a Northwest Airlines flight between Hong Kong and Tokyo , Japan , the NTSB said . Investigators from the NTSB are gathering data recorder information , monitoring system messages , crew statements and weather information , the NTSB said .