巡航下降 是什么？
巡航下降 A gradual descent initiated by the pilot or ATC from cruising altitude, often to optimize fuel burn or prepare for arrival, not directly tied to an approach clearance.
Source: ICAO Doc 9432, FAA PCG
How is “巡航下降” Used in Practice?
ATC：汉莎211，巡航下降批准，经过高度层240时报告。
Certification Exam Relevance
Who Needs to Know This Term?
- Pilots
- Air Traffic Controllers
- Cabin Crew
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巡航下降 是什么？
A gradual descent initiated by the pilot or ATC from cruising altitude, often to optimize fuel burn or prepare for arrival, not directly tied to an approach clearance.
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