Final answer:
Trimmed in aircraft stability refers to the adjustment of control surfaces to allow an aircraft to maintain steady flight without constant manual input. It ensures the aircraft sustains a set attitude and trajectory, reducing pilot workload and increasing efficiency.
Step-by-step explanation:
In the context of aircraft stability, trimmed refers to the adjustment of control surfaces to ensure that an aircraft maintains steady flight without requiring constant control inputs from the pilot. When an aircraft is well-trimmed, it can sustain flight at a certain attitude, speed, and trajectory without manual corrections. This trimming process involves setting the elevator, ailerons, and rudder to appropriate positions so that the aerodynamic forces acting upon them balance out, and the aircraft does not pitch, roll, or yaw unintentionally.
The trim can be adjusted manually by the pilot or automatically by the aircraft's trim system. A well-trimmed aircraft contributes significantly to efficient flight operations, as it reduces pilot workload and aids in conserving fuel by flying in an optimized state.