The aircraft was descending through approximately FL210 and the pilots indicated that they needed more than 30 nm. At 21:19, the controller instructed SR 111 to turn left to a heading of 030 for a landing on runway 06 at the Halifax, and advised that the aircraft was 30 nm from the runway threshold. Two minutes later they were cleared down to 3000 feet. At 21:16, the controller cleared SR 111 to descend to 10000 feet. At this time, the pilots donned their oxygen masks. They immediately received an ATS clearance to fly directly to Halifax. The pilots expressed a preference for Halifax. Then the controller asked SR 111 whether they preferred to go to Halifax. The Moncton ACC controller immediately cleared SR 111 to turn right toward Boston and to descend to F元10. The pilots named Boston, which was about 300 nm behind them. The pilots reported that there was smoke in the cockpit and requested an immediate return to a convenient place. The aircraft was about 66 nm southwest of Halifax. Four minutes later a Pan Pan radio call was made to Moncton ACC. They assessed that the odour and smoke were related to the air conditioning system. They determined that some smoke was present in the cockpit, but not in the passenger cabin. At 21:10 the pilots detected an unusual odour in the cockpit and began to investigate. Forty minutes later the copilot contacted Moncton ACC, reporting F元30. Genève-Cointrin Airport (GVA/LSGG), SwitzerlandĪt 20:18 Swissair flight SR 111, departed New York-JFK Airport on a flight to Geneva, Switzerland. Kennedy International Airport, NY (JFK/KJFK), United States of America 9 km (5.6 mls) SW off Peggy’s Cove, NS ( Canada)

Md11 cockpit