The Elevator System: An Elevatortor System On The Twin Otter

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The elevator system on the Twin Otter is composed of two non-interchangeable semi-elevators; the right side elevator is equipped with a flap/elevator interconnect trim tab and the left side elevator with a commanded elevator trim tab. A push pull rod connected to the elevator control lever mounted under the floor of the cockpit transfers the movement of the control column. The cables running along the right hand side of the fuselage, under the floor of the cabin transmit the movement to the elevator control quadrant The cables which run under the floor of the cabin along the right side of the fuselage transmit movement to the elevator control quadrant, situated in the vertical stabilizer under the attachment of the rear spar, to the horizontal stabilizer. A push-pull rod connects the control quadrant to a lever which integrates the central articulation and the link between both semi-elevators. …show more content…

These two cables form a closed loop. The failure of one cable makes it impossible to actuate the elevator. On the day of the accident, the elevator cables, reference TBE069053-3 (pitch-down) and TBE069053-4 (pitch-up), totaled 1,181 hours and 6,370 airplane cycles. The DHC 6-300 is fitted with a hydraulic system for controlling the following devices: Flaps, Wheel brakes, Nose wheel steering. SYSTEM OPERATION EVALUATION The system operates on the basis of two elevator control

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