Definition
The airspeed used while flying the traffic pattern around an airport, slower than cruise but faster than approach, set to allow safe maneuvering, configuration changes, and spacing with other traffic before final approach.
Plain English
The speed a pilot flies while circling the airport to land. It is slow enough to make turns and lower flaps and gear safely, but fast enough to stay well above a stall.
Context Anchor
Seen in stall training, traffic-pattern work, and approach practice, especially when the aircraft is slowed and configured as it would be before landing.
Derivation
Pattern' here refers to the rectangular flight path pilots follow around a runway before landing, called the traffic pattern. 'Pattern airspeed' is simply the speed flown while in that pattern. The word 'pattern' comes from the Old French 'patron,' meaning a model or template — the standard shape pilots fly.
Why Pilots Care
Using the correct pattern airspeed keeps the airplane at a safe speed and attitude while turning and changing flaps or gear, reducing the chance of an inadvertent stall.
Intuition Check
Do not read “pattern” as just a general habit or design. Here it means the airport traffic pattern or a maneuver flown as if the aircraft were in that phase. Do not read “airspeed” as ground speed. It is the speed through the air shown to the pilot.
Example Sentence 1
After entering the downwind leg, the pilot reduced power and slowed to pattern airspeed before lowering the first notch of flaps.
Example Sentence 2
On base leg the pilot slowed to the published pattern airspeed while banking to final.