Definition
A single, continuous operation of an aircraft engine, performed for a specific purpose such as testing, warm-up, ground checks, or measuring performance. A run begins when the engine is started and ends when it is shut down or transitioned to a different operating phase.
Plain English
One uninterrupted period of running the engine for a particular reason, like checking that it works properly or warming it up before flight.
Context Anchor
Seen in phrases such as takeoff run, landing run, engine run, and scheduled run.
Derivation
Run comes from Old English words meaning to move quickly or flow. That original idea of continuous motion helps the aviation meaning: a run is not a single instant, but a stretch of movement or operation from start to finish.
Why Pilots Care
Engine runs are logged for maintenance tracking and must be performed correctly to verify airworthiness before flight.
Intuition Check
Do not read run as only meaning a person moving on foot. In aviation, it usually means a continuous aircraft movement, engine operation, or route operation.
Example Sentence 1
After replacing the spark plugs, the mechanic performed a ground run to verify smooth operation at all power settings.
Example Sentence 2
After the engine start, the pilot noted the total run time in the aircraft logbook.