Ground simulation investigation of helicopter decelerating instrument approaches

Improving rotorcraft deceleration guidance for brownout landing

“…These augmented states can reduce the amount of controlling required during an approach and lessen the workload for the pilot. As Lebacqz 44 found during an IMC (instrument meteorological conditions) decelerating rotorcraft approach study, attitude command augmentation was needed in order to have satisfactory handling quality ratings.…”

“…From the study, it was recommended that some form of flight director be included for decelerating approaches to hover. Lebacqz44 tested the Constant Deceleration, the Constant Attitude and an algorithm created to mimic visual flight deceleration (increasing deceleration with decreasing range), though no significant differences were found between them.…”