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Narrative: After a brief flight of approximately 9 minutes, the helicopter established hover above the Mathare area in Nairobi, at approximately 5700ft barometric altitude. Witnesses from the ground reported that the aircraft spent about 2 minutes in HOGE above Mathare, before suddenly losing altitude and crashing inside the perimeter of the National Youth Service Engineering Institute, while spinning around the vertical axis with a significant yaw rate at 13.15 UTC, consistent with videos posted on social media. Three POB suffered serious injuries and one minor injuries.
At 13:14:49, the following chain of events occurred: The pilot significantly increased the collective. The torque limiter logic prevented the engines from exceeding 110% torque. The Nr drooped to 96% with the “ROTOR LOW” Aural Warning. The pilot compensated for the right yaw with left pedal. The pilot lowered the collective 20% in about 2.5s. Nr returned to 100%, descent rate increased, and the aircraft started to yaw left. Aircraft reached 20°nose-down, 4000ft vertical speed, and 60kts ground speed.
At 13:15:03, the following occurred: A sudden rise in collective input without any pedal compensation; the yaw rate increased. The aircraft crashed with a spiraling motion.