马赫数是什么？

马赫数 The ratio of the true airspeed of an aircraft to the speed of sound under the same atmospheric conditions. Used in ATC for speed assignments and reporting in high-speed flight.

Source: ICAO Doc 9432, FAA PCG

How is “马赫数” Used in Practice?

保持马赫数0.80或更高，如因颠簸或性能限制无法维持请告知。

Certification Exam Relevance

ICAO Level 4ICAO Level 5ICAO Level 6EASA FCL.055

Who Needs to Know This Term?

Pilots
Air Traffic Controllers
Cabin Crew

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Frequently Asked Questions

马赫数是什么？

The ratio of the true airspeed of an aircraft to the speed of sound under the same atmospheric conditions. Used in ATC for speed assignments and reporting in high-speed flight.

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Last updated: March 09, 2026

马赫数 是什么？