Definition
The specified altitude at which aircraft fly the airport traffic pattern, typically 1,000 feet above airport elevation for propeller-driven aircraft, unless established otherwise for a particular airport. It is flown on the downwind leg and serves as the reference altitude from which the descent to landing is begun.
Plain English
The standard height pilots fly when circling the airport to land. At most airports, that means flying 1,000 feet above the ground around the airport, then descending from there as you turn toward the runway.
Context Anchor
Used when entering, flying, or leaving the airport traffic pattern, especially at non-towered airports or when reviewing airport information before arrival.
Derivation
Pattern' here refers to the rectangular flight path flown around the runway -- the traffic pattern. 'Pattern altitude' is simply the altitude at which that pattern is flown. Calling it out as a named altitude matters because every aircraft in the pattern is expected to be at the same height, which keeps separation predictable.
Why Pilots Care
Flying the correct pattern altitude keeps all aircraft at the same level, reducing collision risk and allowing predictable approaches for everyone in the pattern.
Intuition Check
Pattern altitude does not mean any altitude you happen to have while near the airport. It means the specific target height used for that airport’s traffic pattern.
Example Sentence 1
After takeoff, climb straight ahead and turn crosswind only after reaching pattern altitude.
Example Sentence 2
At the uncontrolled field the pilot entered the downwind leg at pattern altitude and adjusted speed for landing.