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AVSAF_CET-APR24: 5942638V, Misidentification of the initial odour and…
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Air crew were not equipped to recognised and immediately react to signs of potential in-flight fire.
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Aircraft Accident:
MD-11 SR111
Flight from New York, United States to Geneva, Switzerland. The aircraft impacted with water near Peggy's Cove, Nova Scotia, Canada. Pilots detected an unusual odour in the cockpit and began to investigate. They determined that some smoke was present in the cockpit but not in the passenger cabin. They assess that the odour and smoke were related to the air conditioning system. Due to the smoke, the pilots requested for an immediate return to a convenient place. They received an ATS clearance to fly directly to Halifax, Nova Scotia. At this time, the pilots donned their oxygen masks. The controller cleared SR111 to descend to 10,000 feet above the sea level and asked the for the number of passengers and amount of fuel onboard. The pilots asked the controller to to stand by for information. The crew then discussed internally to dump fuel based on the aircraft's gross weight and agreed to dump the fuel. The controller then made a second request for the number of persons and amount of fuel on board but SR111 did not relay the the number of persons onboard. Twenty seconds later, the pilot notified the controller that they had to fly the aircraft manually and asked for a clearance to fly between 11,000 and 9,000 feet. The controller notified SR111 that they were cleared to fly at any altitude between 5,000 and 12,000 feet. Not long later, both pilots almost simultaneously declared an emergency and the controller acknowledged this transmission. SR111 indicated that they were starting to dump fuel and that they had to land immediately. The controller indicated that he would get back to them in just a couple of miles. SR111 acknowledged. The controller cleared SR111 to dump fuel; there was no response from the pilots. The controller repeated the clearance but there was no further communication between SR111 and the controller. At about 0131, several observers heard a sound described as a loud clap. Seismographic recorders on Halifax, Nova Scotia, and in Moncton, New Brunswick, recorded a seismic event at 0131:18, which coincides with the time the aircraft struck the water. The aircraft was destroyed by impact forces and there were no survivors.