Changing the climb speed schedule from 290/0.74 to 280/0.74 will affect the crossover altitude how?

Changing the climb speed schedule from 290 knots to 280 knots at the lower speed limit while maintaining the same true airspeed (TAS) ratio (0.74) impacts the aerodynamic performance of the aircraft. Lowering the indicated airspeed allows the aircraft to achieve a more efficient climb at lower altitudes, which affects the altitude at which the aircraft transitions to the specified climb speed schedule.

The crossover altitude is the point at which the airplane changes from a lower speed schedule to a higher speed one. By reducing the initial climb speed, the aircraft can climb more efficiently, potentially increasing the altitude at which it can maintain optimal climb performance up to the higher speed limits. Essentially, the aircraft may be able to climb higher before it is constrained by speed limits, which results in raising the crossover altitude.

This consideration incorporates factors such as aerodynamic drag, engine performance at various altitudes, and aircraft design characteristics, all of which contribute to altered climb profiles. Therefore, this adjustment in climb speed necessitates a reassessment of the altitude at which the aircraft can effectively transition, resulting in a higher crossover altitude.