Accident Kinematics Parameter Extraction, A Simulation Tool

Abstract

This paper outlines the algorithm behind the Safety Board’s kinematics parameter extraction code. The Metrojet flight 2710 incident will be used as an example of the use of this method when control surface deflections were not recorded. The study of this incident also provides a comparison with the conventional simulation method. The Alaska flight 261 accident illustrates the use of the kinematics parameter extraction method when the recorded stabilizer parameter had exceeded the sensor range. This accident also illustrates the adaptation of the basic kinematics code to calculate loads on the stabilizer jackscrew. This paper is declared a work of the U.S. Government and is not subject to copyright protection in the United States. Nomenclature α Angle of attack β Sideslip angle φ Roll angle θ Pitch angle ψ Heading angle Fxb Longitudinal body axis force Fyb Lateral body axis force Fzb Vertical body axis force g Gravitational acceleration Ixx Inertia about x axis Iyy Inertia about y axis Izz Inertia about z axis Ixz Product of inertia Lb Body axis rolling moment m Mass Mb Body axis pitching moment Nb Body axis yawing moment Nx Longitudinal load factor Ny Lateral load factor Nz Vertical load factor Pb Body axis roll rate . Pb Body axis roll acceleration Qb Body axis pitch rate . Qb Body axis pitch acceleration Rb Body axis yaw rate . Rb Body axis yaw acceleration t Time Ub Body axis longitudinal velocity Vb Body axis lateral velocity Wb Body axis vertical velocity