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Human Factors and Safety Management Systems
Published in Stephen J Wright, Aviation Safety and Security, 2021
The Trident aircraft is a T-tail jet aircraft that has traditional flight characteristics. The problems with T-tail aircraft are to do with the stall characteristics: namely if the aircraft enters a deep stall, the flight crew will be unable to recover the situation. This is because the elevator surface has become ineffective due to the stalling turbulent air passing over the tail section; thus the usual nose-down attitude required to recover is ineffective. To prevent this type of stalling event transpiring, the manufacturers added a stall warning system, comprising two angle of attack sensors on each side of the nose of the flight deck. In addition to the stall warning system, a stick push device is attached to the elevator control circuit, and this would typically activate after 10 seconds of continuous stall warning. An underlying problem with the Trident aircraft was that of false stall warnings during its previous operational service. A number of operational BEA crews experienced this spurious stall warning activation. Consequently, it was considered acceptable to cancel the warning and to continue flying, treating the warning system with some level of scepticism.
Investigation of propeller slipstream effects on lateral and directional static stability of transport aircraft
Published in Engineering Applications of Computational Fluid Mechanics, 2022
Shuai Zhao, Jie Li, Youxu Jiang, Ruizhan Qian, Ruifei Xu
The basis of this investigation is a typical twin-engine, 70 passengers turboprop airliner with a conventional high-wing, T-tail design. The two propellers rotate clockwise (looking from the rear fuselage), which is similar to the ATR72 and Dash8-Q400. As shown in Figure 1, the take-off configuration of the aircraft that is discussed in this paper consists of the fuselage, empennages, nacelles, propellers, and wings, which include high lift systems and the flap track fairings.