At the start of each flight phase, an ACARS message is transmitted to the ground describing the flight phase, the time at which it occurred, and other related information such as the amount of fuel on board or the flight origin and destination.
在每一飞行阶段的开始时刻，ACARS将一个数字报文发送到地面，其中包括飞行阶段名称、发生时刻，以及其他诸如燃油量或始发地和目的地。