Autopilot/flight director underspeed protection system

Details Autopilot/flight director underspeed protection system Autopilot/flight director underspeed protection system

1995-05-15

1998-05-05

Mojica, Virna Lissi

Aeronautics and astronautics

Aircraft control

Automatic

244178, 244182, 244186, 244195, 364432, B64C 1308, G05D 100, G05D 108

Patent

active

057463921

ABSTRACT:
An underspeed protection system for an aircraft under autopilot control selects a target speed based upon the greater of a minimum maneuver speed and a stick shaker speed. The system then compares a monitored speed to the target speed to produce an error signal. The system also monitors vertical speed to determine if the aircraft begins to descend. If the error signal due to the underspeed condition causes the aircraft to descend, the system provides a hold zero vertical speed signal in place of the error signal such that the aircraft seeks to maintain its altitude. The hold zero vertical speed signal overrides the underspeed error signal such that the aircraft does not pitch forward to seek an increased speed.

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