Definition
The airspeed at which an aircraft stalls in unaccelerated, level flight at a load factor of 1 G, with no bank and no abrupt control inputs. It represents the lowest speed at which the wing can produce enough lift to support the aircraft's weight when only gravity is acting on it.
Plain English
The slowest speed the aircraft can fly straight and level before the wing stops producing enough lift and the aircraft stalls. It assumes wings level and no turning or pulling up.
Context Anchor
Seen in load factor discussions, especially when comparing a straight-ahead stall with the higher stall speed that can occur in a steep turn or abrupt maneuver.
Derivation
“Stall” originally means to stop or come to a standstill. In flying, it means the wing has stopped producing smooth, reliable lift because the airflow has separated from it. “Normal” here means the standard baseline condition, not just what usually happens.
Why Pilots Care
Knowing the normal stall speed lets a pilot calculate how much higher the stall speed will rise during turns or abrupt maneuvers, preserving a safe margin above stall.
Grounding Statement
Picture the airplane slowing in straight, steady flight: that stall speed is the reference point before maneuvering loads make the stall happen faster.
Intuition Check
Do not read “normal” as “the speed where stalls usually happen.” Here it means the standard 1 G reference stall speed, with no extra load from maneuvering.
Example Sentence 1
The pilot noted the normal stall speed from the airspeed indicator and added a margin before flying the approach.
Example Sentence 2
The student remembered that any bank would increase the stall speed well above the normal stall speed shown on the airspeed indicator.