EgyptAir Flight 990

EgyptAir Flight 990 was a scheduled flight from Los Angeles International Airport to Cairo International Airport, with a stop at John F. Kennedy International Airport, New York City. On October 31, 1999, the Boeing 767 operating the route crashed into the Atlantic Ocean about 60 mi south of Nantucket Island, Massachusetts, killing all 217 passengers and crew on board, making it the deadliest aviation disaster for EgyptAir. Since the crash occurred in international waters, it was investigated by the Egyptian Ministry of Civil Aviation's Civil Aviation Agency (ECAA) and the American National Transportation Safety Board (NTSB) under International Civil Aviation Organization rules. Since the ECAA lacked the resources of the NTSB, the Egyptian government asked the American government to have the NTSB handle the investigation.

Two weeks after the crash, the NTSB proposed that it hand the investigation over to the United States Federal Bureau of Investigation (FBI), as all of the evidence that they had collected up until that point suggested that a criminal act had taken place, and that the crash was the result of an intentional act. The Egyptian authorities refused to accept this idea, and repeatedly declined the proposal to hand the investigation over to the FBI. As a result, the NTSB was forced to continue the investigation alone, despite it falling outside their investigative purview.

The NTSB found that the cause of the accident was the airplane's departure from normal cruise flight and subsequent impact with the Atlantic Ocean "as a result of the relief first officer's flight control inputs". However they were ultimately unable to determine any specific reason for his alleged actions.

The ECAA independently concluded that the incident was caused by mechanical failure of the aircraft's elevator control system. The Egyptian report suggested several possibilities for the cause of the accident, focusing on the possible failure of one of the right elevator's power control units. However, the NTSB continues to dispute the findings of the ECAA report, claiming that there is no possible explanation for the flight's final movements, other than an intentional human act.

Flight details

At 1:20 am EST (06:20 UTC), the aircraft took off from JFK's runway 22R.

At 1:44, the flight reached its cruising altitude of 33,000 feet. At 1:48, captain El-Habashi left the cockpit and went to the lavatory. During that time, relief first officer Al-Batouti was alone in the cockpit. At 1:48:39, he began to exclaim, "I rely on God," and, at 1:49:45, disengaged the autopilot. The autopilot-disengagement warning was not heard on the CVR, indicating that the autopilot was disengaged manually, and, for the next 10 seconds, the aircraft remained in straight and level flight.

Flight recorders

The cockpit voice recorder (CVR) recorded the captain excusing himself to go to the lavatory, followed 30 seconds later by the first officer saying in Egyptian Arabic, "Tawakkalt `ala Allah" (Arabic: توكلت على الله), which can be translated as "I put my trust in God" or "I rely on God". A minute later, the autopilot was disengaged, immediately followed by the first officer again repeating the same Arabic phrase. Three seconds later, the throttles for both engines were reduced to idle, and both elevators were moved 3° nose down. The first officer repeated "I put my trust in God" seven more times before the captain suddenly asked repeatedly, "What's happening, what's happening?" The flight data recorder (FDR) reflected that the elevators then moved into a split condition, with the left elevator up and the right elevator down, a condition that is expected to result when the two control columns are subjected to at least 50 lbf of opposing force. At this point, both engines were shut down by moving the start levers from run to cutoff. The captain asked, "What is this? What is this? Did you shut the engines?" The captain is then recorded as saying, "get away in the engines" (this is the literal translation that appears in the NTSB transcript), followed by "shut the engines". The first officer replies "It's shut". The final recorded words are the captain repeatedly stating, "Pull with me" but the FDR data indicated that the elevator surfaces remained in a split condition (with the left surface commanding nose up and the right surface commanding nose down) until the FDR and CVR stopped recording. No other aircraft were in the area, and no indication was given that an explosion occurred on board. The engines operated normally for the entire flight until they were shut down. From the presence of a western debris field about 1200 ft from the eastern debris field, the NTSB concluded that the left engine and some small pieces of wreckage separated from the aircraft before water impact.