ptr3 口试（Ptr3 oral test）.docVIP

ptr3 口试（Ptr3 oral test） The third stage of oral exams The ninth chapter (ren pumping 4 questions) Effect of 1. wing pollution has the characteristics of what? (1) the lift decreases; (2 points) (2) the stall speed is larger; (2 points) (3) the stall angle is smaller (2 points); (4) the resistance increased; (2 points) (5) the center of lift displacement; (2 points) 2. what is the effect on the aircraft icing system? (1) the air inlet of the engine from pollution, may reduce the available thrust; (2 points) (2) when the main control plane surface area is not clear when the pollution control surface will freeze blocked in the original position or movement. At the same time, should pay attention to in the control surface area freezes, will damage the operation of the aircraft control surface (2); (3) the ice when the landing gear is not cleared, will damage the landing gear. Accumulate in the landing gear and the deflection lever on the snow / snow on takeoff aircraft damaged by falling; (2 points) (4) when the plane external sensor probe or probe hole, or sensor in front of or near the area of pollution, will be on the flight instrument, engine instrument or other instrument, and the automatic control system to provide false information; (2) (5) the gate and the cargo door sealing ring on the remaining water or ice, will cause damage to the aircraft or compromised seal ring. (2 points) 3. step deicing / anti icing and deicing / anti icing step two what are the characteristics? (1) a step of deicing / anti icing: this procedure for heating anti icing fluids. The liquid used for aircraft deicing, and retained in the plane surface, in order to play the role of anti icing. (5 points) (2) the two step deicing / anti icing: this procedure includes two independent steps. The first step is to de icing, then the second step is the application of different anti icing fluid. In addition to the ice, then spray a separate key surface of the anti icing fluid to protect aircraft ant