Definition
The lowest airspeed at which a multi-engine airplane can be controlled directionally with the critical engine suddenly inoperative, the remaining engine at takeoff power, and the airplane configured per the manufacturer's certification conditions. Below this speed, the rudder can no longer counter the asymmetric thrust, and the airplane will yaw uncontrollably toward the dead engine.
Plain English
The slowest speed at which a twin-engine airplane can still be kept flying straight after one engine quits. Slower than this, the rudder isn't strong enough to stop the airplane from swinging sideways toward the failed engine.
Context Anchor
Seen in multiengine airplane training, takeoff planning, performance charts, and engine-failure discussions.
Derivation
From 'minimum' (the smallest amount) and 'control' (here meaning directional control — the ability to keep the airplane pointed where you want it). The term names exactly what it measures: the slowest speed at which control is still possible.
Why Pilots Care
Operating below this speed after an engine failure can result in immediate loss of directional control and a possible crash; it sets the lower limit for safe continued takeoff.
Grounding Statement
At very low speed, there may not be enough airflow over the controls to overcome the uneven push from the operating engine.
Intuition Check
Do not read “minimum” as “the slowest speed the airplane can fly.” Minimum control airspeed is about keeping control after an engine fails, not about how slowly the airplane can stay in the air.
Example Sentence 1
During multi-engine training, the instructor demonstrated a VMC scenario at a safe altitude so the student could feel how the airplane wants to yaw when one engine fails near minimum control airspeed.
Example Sentence 2
During the engine-out drill the instructor demonstrated how quickly directional control is lost below minimum control airspeed.