FAA Ground School Practice Test

The color that identifies the never-exceed speed, which is critical for safe aircraft operation, is represented by a red radial line on the airspeed indicator. This line marks the maximum speed that should not be exceeded under any circumstances. Exceeding this speed can lead to serious aerodynamic issues such as structural failure or loss of control.

Understanding that the red radial line signifies this limit is important for pilots to ensure they operate the aircraft safely within its designed capabilities. The other colors on the airspeed indicator denote different speed ranges, such as the green arc for normal operating speeds and the yellow arc for caution or operation in turbulent air, but it is the red radial line that serves the vital function of indicating the never-exceed speed.