| Scope and method of study. The research develops a systematic methodology to achieve the following goals: (1) to develop the multi-axis dynamic models for a specific aircraft with various types and degrees of damage, (2) to relate Cooper-Harper pilot ratings to the performance index for pilot closed loop control of damaged aircraft dynamics by use of optimal control pilot model, (3) to monitor and predict the states of loss of control for various maneuvers performed by a specific aircraft with damage. The utilized aircraft is Gates Learjet 24B. The strategy of the methodology is as follows: (1) establishing dynamic models, (2) obtaining the single-axis transfer functions, (3) obtaining the single-axis performance index, (4) transforming the single-axis performance index into single-axis pilot opinion rating(POR), (5) integrating single-axis PORs to multi-axis POR.;Findings and conclusions. The controllability of the specific aircraft with damage is monitored and predicted while the aircraft is performing a specific maneuver. The sensitivity to a specific damage of the aircraft is also examined. Moreover, the vulnerability of the aircraft is identified. That is, the controllability can be more seriously reduced due to the loss of wing surface than the tail failure. Finally, a set of safety criteria for operating this aircraft is established. |
