微软模拟飞行2020空中客车A320Neo通用飞行教程

速度/马赫切换

At high altitudes the Mach number (speed divided by speed of sound) becomes the relevant speed limit for the aircraft. E.g. the A320 can only fly Mach 0.85 (85% the speed of sound). At such high speeds the sound barrier starts to have an effect and creates a lot of drag. For this reason it becomes more economical to fly at lower indicated airspeeds at a fixed economical mach number (ECON Mach). At the crossover altitude the autopilot therefor automatically transitions from a speed target to a Mach target. SPEED becomes MACH.

The button SPD/MACH allows you to manually switch between the Mach and speed reference after pulling out the speed knob for the selected speed mode.

在高海拔地区，马赫数(速度除以声速)成为飞机的相关速度限制。例如，A320只能飞行0.85马赫(85%的声速)。在如此高的速度下，声屏障开始发挥作用并产生大量阻力。因此，以较低的指示空速以固定的经济马赫数(ECON马赫)飞行更加经济。在交叉高度时，自动驾驶仪会自动从速度目标转换为马赫目标。SPEED变为MACH。

通过按SPD / MACH按钮，可以在拉出所选速度模式的速度旋钮之后手动在Mach和速度参考之间切换。