Aviation English
Flight Phase

Qu'est-ce que Nombre de Mach ?

Nombre de Mach 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 “Nombre de Mach” Used in Practice?

Maintenez Mach zéro huit zéro ou plus, informez si impossible à cause de la turbulence ou des limitations.

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

Qu'est-ce que Nombre de Mach ?

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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