underspeed

Definitions

An excessively-low speed; a speed lower than the minimum operating speed.

uncountable

Equivalents

Examples

“An underspeed switch⟳ drops the load⟳ off if engine speed⟳ falls to 380 r.p.m. and an overspeed governor shuts the engine off if its speed⟳ rises above 1,700 r.p.m.”

“These boundaries can vary⟳ from prelaunch predictions due to changing atmospheric conditions and variations in SRB and main engine performance. Using this real-time information, a computer and software program⟳ called the Abort Region Determinator (ARD) allows MCC to predict⟳ the underspeed that will result⟳ from a loss of performance (engine failure, throttle lockup, degraded thrust, etc.). This information is then used to predict⟳ the actual abort mode boundaries on which the real-time voice calls are made. These boundaries vary⟳ from pre-flight predicted boundaries.”

CEFR level