Appendix F F-2 Acronym/Term Definition V1 The maximum speed in the takeoff at which the pilot must take the first action (for example, apply brakes, reduce thrust, deploy speed brakes) to stop the airplane within the accelerate-stop distance. V1 also means the minimum speed in the takeoff, following a failure of the critical engine at VEF, at which the pilot can continue the takeoff and achieve the required height above the takeoff surface within the takeoff distance.
V2 Takeoff Safety Speed. (The target speed to be reached by the time the airplane is 35 feet above the takeoff surface.)
V2MIN Minimum Takeoff Safety Speed VCW Crosswind Component of Wind Speed VDF/MDF Demonstrated Flight Diving Speed VEF Engine Failure Speed. The speed at which the critical engine is assumed to fail during takeoff.
VFC Maximum Speed for Stability Characteristics VFE Maximum Flaps Extended Speed VMO Maximum Operating Limit Speed VREF Landing Reference Speed VS 1-g 1-g Stall Speed. The calibrated airspeed at which aerodynamic forces alone can support the airplane in 1-g flight.
VSR Reference Stall Speed. VSR may not be less than VS 1-g. For airplanes with a device that abruptly pushes the nose down at a selected angle of attack (for example, a stick pusher), VSR may not be less than 2 knots or 2 percent, whichever is greater, above the speed at which the device operates.
VSR1 Reference Stall Speed in a Specific Configuration
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