What is Mach number?
Mach number 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 “Mach number” Used in Practice?
Maintain Mach decimal eight zero or greater, advise if unable due to turbulence or performance limitations.
Certification Exam Relevance
Who Needs to Know This Term?
- Pilots
- Air Traffic Controllers
- Cabin Crew
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What is Mach number?
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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