1974 EgyptAir Tupolev Tu-154 crash
It was the first Tupolev Tu-154 delivered to EgyptAir, on 1 December 1973, and was named Nefertiti after the wife of the Egyptian pharaoh Akhenaten.[1][2] The aircraft was performing a training flight at Cairo International Airport carrying a crew of six; two EgyptAir pilots and four Soviet instructors.[4][5][6] Investigators determined that the pilot flying had applied too many pitch-up inputs, as well as incorrect center of gravity calculations.[5] The following year, in 1975, EgyptAir returned its remaining Tupolev Tu-154s to the Soviet Union.[2] In the same year, during the production of the Tu-154B, systems for flap resynchronization and the rearrangement of stabilizers were installed to prevent any similar incidents.