Definition
Mach number
The ratio of true airspeed to the speed of sound; e.g., MACH .82, MACH 1.6.
Source: FAA Pilot/Controller Glossary (verbatim from the Federal Aviation Regulations).
Where This Term Is Used
- 14 CFR § 91.818 — § 91.818 Special flight authorization to exceed Mach 1.
- 14 CFR § 91.817 — § 91.817 Civil aircraft sonic boom.
2 sections reference this term in their FAR Decoded content.