Study on control motion for checked maneuver in civil aircraft

Checked maneuver is one of the most important loads checking cases stated in CCAR-25 for civil aircraft design. Different understanding of corresponding regulations leads to remarkable deviations in load calculations, which greatly affect accurate aircraft loads prediction. From inherent connections between GJB and CCAR-25, an novel operation law for checked maneuver is proposed in this paper. B operation during rapid pitching from GJB is first used, angular accelerations under loads factor of 1.0 and 2.5 are then checked and adjusted correspondingly until both get satisfied. Current method in this paper can guarantee B operation during rapid pitching for military aircraft, and in the meantime meet requirements for angular accelerations in CCAR-25, which eliminate a long existed disagreement in checked maneuver engineering calculation and will benefit future commonality design between civil and military aircrafts. Homemade computer programs implementing this method have been developed and applied successfully in trunk airliner project.