Definition
An altitude or altitudes, stated in the order flown, which are to be maintained until reaching a specific point or time. Altitude restrictions may be issued by ATC due to traffic, terrain, or other airspace considerations.
Plain English
A specific altitude that ATC tells you to fly at, or stay at, until you reach a certain point or a certain time. It limits where you can climb or descend.
Context Anchor
Pilots see altitude restrictions in air traffic control clearances, on approach charts, and on published arrival or departure routes.
Derivation
Altitude comes from the Latin altus, meaning high. Restriction comes from a Latin word meaning to bind or hold back. Together, the words point to a height that is not freely chosen; it is controlled by a specific requirement.
Why Pilots Care
Ensures safe separation from terrain, obstacles, and other traffic while complying with published procedures and controller instructions.
Intuition Check
Do not read restriction as a suggestion or general target. In this context, it is a required altitude rule unless air traffic control changes or cancels it.
Example Sentence 1
ATC issued the altitude restriction "cross JONES at or above 8,000," so the crew planned the descent to meet it.
Example Sentence 2
The arrival procedure shows an altitude restriction to cross the fix at or above 6,000 feet.