with sufficient speed to penetrate the plane and damage the flight controls, which could explain why the plane suddenly pitched up and barrel-rolled immediately after the explosion. 5 years before the crash of Flight 105, in Poland an Ilyushin Il-62 crashed into a moat after its engine number 2 exploded and damaged the plane's elevator and aileron. Immediately after the explosion, the plane nosedived to the ground. The explosion was caused by a detached removable sleeve spacer inside the right engine. The detachment was caused by metal fatigue. Examination of the turbine fragments and their distribution during the explosion led to the conclusion that the ejection of the fragments didn't contribute to the crash, as the velocity of the fragments was substantially absorbed and decreased by the engine cowling. The NTSB noted that several parts of the engine could not be found; they concluded that, based on their calculation and distribution of the fragments on the ground, the unidentified parts were reduced to tiny, harmless bits. The left engine did not exhibit any signs of pre-impact damage or failure The NTSB also stated that, although the explosion caused serious damage to the engine cowling, the cowlings were all latched. None blew outwards, which would have caused a massive drag force on the plane. This, in turn, could have affected the controllability of the plane. Small portions of the cowling did blow outwards, but the NTSB concluded that these parts caused very little drag force. The NTSB later concluded that even if any turbine parts were ejected and somehow able to penetrate the plane, the impact would be small and no controls would be affected. Pilot error In the initial seconds after the explosion, Flight 105 swayed to the right and left. In response, the pilot used the rudder to counteract the plane's movements. The examination concluded that the plane was easily controllable and that it could still be controlled properly without the rudder inputs. Additionally, the crew made a pitch input, raising the aircraft's nose. The crew may have wrongly perceived the nature of the emergency. Since the explosion of the engine caused the loss of engine thrust, the speed of the plane decreased. This rapid deceleration caused the crew to think that the plane was pitching down, which may explain why the crew made a nose-up input, while in reality, it didn't pitch down. This phenomenon is known as