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Aviation Glossary :: Mach Number  Aviation Glossary :: Mach Number FAA Written Test Preparation
Aviation Glossary Welcome to the Dauntless Aviation Glossary!

At Dauntless, our editorial staff maintains the web's largest unified glossary of aviation terms. This glossary is built from a combination of official, quasi-official, and proprietary sources (including original material that we develop oursselves). Uniquely, we often provide multiple definitions of a given term so that you can find that which best applies to you. In order to maximize your learning efficiency, this glossary (and similar ones for our international users) is incresingly fully integrated into our aviation learning apps, including our FAA written test prep and FAA practical test prep software and apps. If you like this glossary, you'll love them with their polished learning environments and world's best and clearest content (please do give them a try.).

Mach Number
Mach Number
A measurement of speed based on the ratio of the speed of the aircraft to the speed of sound under the same atmospheric conditions. An airplane fling at Mach 1 is fling at the speed of sound.
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source: FAA Aviation Maintenance Technician Airframe Handbook (FAA-H-8083-31)

The ratio of the speed of an object through the air to the speed of sound under the same atmospheric conditions. An object traveling at the speed of sound is traveling at Mach one (M1.0).
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source: FAA Aviation Maintenance Technician Powerplant Handbook (FAA-H-8083-32)

Mach number means the ratio of true airspeed to the speed of sound.
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source: FAA Federal Aviation Regulations (CFR 14 Part 1)

The ratio of the velocity of a body to that of sound in the surrounding medium.
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source: FAA Flight Navigator's Handbook (FAA-H-8083-18)

The ratio of true airspeed to the speed of sound; e.g., MACH .82, MACH 1.6.
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source: FAA Pilot/Controller Glossary

The ratio of the true airspeed of the aircraft to the speed of sound in the same atmospheric conditions, named in honor of Ernst Mach, late 19th century physicist.
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source: FAA Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25A)

the ratio of the speed of the aircraft to the speed of sound: The aircraft is flying at Mach 0.89
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source: ICAO English Pro Aviation Glossary


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Disclaimer: While this glossary in most cases is likely to be highly accurate and useful, sometimes, for any number of editorial, transcription, technical, and other reasons, it might not be. Additionally, as somtimes you may have found yourself brought to this page through an automated term matching system, you may find definitions here that do not match the cotext or application in which you saw the original term. Please use your good judgement when using this resource.


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