A method for controlling one or more of engine thrust cutback and engine thrust restoration is described which is related to aircraft environmental emissions abatement. The method comprises receiving aircraft location data from at least one navigational sensing system, comparing the aircraft location data against location data identifying an environmental emissions abatement area, and controlling at least one of thrust cutback and thrust restoration of the aircraft engines based on the comparing of aircraft location to the location of the environmental emissions abatement area.

 
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> Rotorcraft having coaxial counter-rotating rotors which produce both vertical and horizontal thrust and method of controlled flight in all six degrees of freedom
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