How does the speed range between low speed buffet and high speed buffet change with increasing mass and altitude?

The correct answer reflects the relationship between the speed range of buffet and two key factors: mass and altitude. As aircraft mass increases, the stall speed also rises. This means that at a higher mass, the aircraft is less responsive to control inputs and experiences buffet at higher speeds compared to when it is lighter.

On the other hand, as altitude increases, the air density decreases, which influences the aerodynamic characteristics of the aircraft. At high altitudes, the aircraft operates at lower overall air densities, leading to a reduction in lift and a different stall behavior. This can contribute to the narrowing of the speed range between low speed buffet and high speed buffet.

Together, these factors result in a combined effect where the range in which buffet occurs becomes narrower as both mass and altitude increase. Thus, the understanding of flight dynamics at varying masses and altitudes is critical in maintaining safety and control during flight, particularly as they pertain to stall warnings and buffet onset.