50. Distress call（完）

MAYDAY: 非常紧急的情况下使用，如火警，紧急下降，应急最低燃油等。需要立即采取措施来避免机毁人亡，并取得空中管制部门的优先指挥权。

1. P：MAYDAY, MAYDAY, MAYDAY, Hong Kong Approach, CCA101, engine
failure/flameout, 5 miles south of CH, 6000 feet, heading 360,
inbound for emergency landing.
C：CCA 101, Hong Kong Approach, roger MAYDAY, cleared ILS approach
runway 25R, you are number one.

2. P：MAYDAY, MAYDAY, MAYDAY, Beijing Control, CCA 101, cabin
depressurization, emergency descent to 3000 m, heading 120.
C：CCA 101, roger MAYDAY, break break, all aircraft, emergency descent
between PSN and VMB, aircrafts below 9000m between PSN and
VMB, depart A593 to the east immediately.