NATIONAL BRIEFING / WASHINGTON, D.C.

Federal safety officials said they were investigating two incidents in which airspeed and altitude indications in the cockpits of Airbus A330 planes might have malfunctioned, including one that took place 10 days before the same type of plane crashed into the Atlantic Ocean and killed all 228 people aboard.

The National Transportation Safety Board said the first incident occurred May 21 when TAM Airlines Flight 8091 flying from Miami to Sao Paulo, Brazil, experienced a loss of primary speed and altitude information while cruising.

The second incident involved a Northwest Airlines flight from Hong Kong to Tokyo on Tuesday, the NTSB said.

In both cases, the planes landed safely; no one was hurt.

Air France Flight 447 came down in the mid-Atlantic on May 31 en route from Rio de Janeiro to Paris. The NTSB is a party to the investigation because the some of the plane’s parts came from U.S. manufacturers.