V1 is defined as which speed?

• A. Maximum landing distance
• B. Landing speed
• C. Visual reference speed
• D. Takeoff action speed

Answer: (D)

V1 is the speed at which action must be taken during a takeoff—the point where the crew must decide whether to continue the takeoff or reject it. In practice, if an issue (like an engine failure) occurs before reaching V1, you should abort the takeoff because you can safely stop on the remaining runway. If the issue happens at or after V1, you continue with the takeoff because there isn’t enough runway left to stop safely. That’s why it’s described as takeoff action speed: it marks the boundary between stopping the takeoff and continuing it. The other options don’t describe this boundary: maximum landing distance relates to braking on landing, landing speed is a different performance speed (like Vref), and visual reference speed isn’t a standard takeoff term.