At what angle are forward nacelle modulation prohibited until a certain airspeed is exceeded?

Forward nacelle modulation is a critical aspect of aircraft performance management, particularly concerning optimizing lift and maintaining stability. The specific angle at which forward nacelle modulation is prohibited until exceeding a certain airspeed is 75 degrees.

This restriction exists to ensure the safe handling and operation of the aircraft during different phases of flight, especially when transition to forward flight is being made. If modulation is allowed at too high an angle before the aircraft reaches the necessary airspeed, it could lead to undesirable aerodynamic conditions.

By enforcing this limitation at 75 degrees, the aircraft can maintain controllability and avoid excessive drag or loss of lift, which is essential during takeoff and low-speed flight operations. The specified airspeed ensures that the aerodynamic forces acting on the aircraft are sufficiently stable and that structural integrity is maintained during these phases.

Understanding this modulation limit is vital for pilots and operators to

ensure compliance with the aircraft's operating manual and to promote safe flying practices.