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Flight Phase

マッハ数

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.

Quick answer: 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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Quick answer

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.

Why it matters

マッハ数 matters because it supports clear communication in Flight Phase contexts for Pilots, Air Traffic Controllers, and Cabin Crew. It also connects to aviation training and exam language such as ICAO Level 4, ICAO Level 5, ICAO Level 6, and EASA FCL.055.

Editorial context

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Questions and answers

Questions and answers

What is マッハ数?

In this glossary, マッハ数 refers to: 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.

How is マッハ数 used in aviation?

In aviation communication, this term appears in contexts such as: "マッハ0.80以上を維持してください。乱気流や性能制限で不可能な場合は報告してください。"

Why does マッハ数 matter in aviation?

マッハ数 matters because it supports clear communication in Flight Phase contexts for Pilots, Air Traffic Controllers, and Cabin Crew. It also connects to aviation training and exam language such as ICAO Level 4, ICAO Level 5, ICAO Level 6, and EASA FCL.055.

Who uses マッハ数?

マッハ数 is mainly used by Pilots, Air Traffic Controllers, and Cabin Crew.

What category does マッハ数 belong to?

In this glossary, マッハ数 is grouped under Flight Phase. Related pages in this category explain adjacent procedures, commands and operational concepts.

Where does this definition come from?

This definition is sourced from ICAO Doc 9432, FAA PCG and published by Protermify Aviation as a static aviation reference page.

Definition

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.

Operational example

Maintain Mach decimal eight zero or greater, advise if unable due to turbulence or performance limitations.

Localized term

マッハ数

Localized example

マッハ0.80以上を維持してください。乱気流や性能制限で不可能な場合は報告してください。

Definition language

English reference definition

Source

ICAO Doc 9432, FAA PCG

Category

Flight Phase

Exam relevance

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

Target audience

  • Pilots
  • Air Traffic Controllers
  • Cabin Crew

Related terms

Use the related links below to continue through connected aviation terminology.

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