Definition
A pre-takeoff ground check in which the pilot increases engine power to a specified RPM and verifies that the engine, ignition system, propeller, and related systems are operating correctly before flight. The check typically includes testing each magneto individually, checking for proper RPM drop, verifying carburetor heat function, and confirming engine instruments are reading in their normal ranges.
Plain English
A power-up test of the engine on the ground, done in a safe area before takeoff, to confirm the engine is healthy and ready to fly.
Context Anchor
You encounter this during the before-takeoff checklist, usually in the run-up area near the runway.
Derivation
The phrase comes from 'running up' the engine — increasing it from idle to a higher power setting. The 'up' refers to bringing the RPM up to the test value, not to the aircraft moving.
Why Pilots Care
Identifies engine or magneto problems on the ground so they can be fixed before takeoff, when an engine failure would be far more dangerous.
Intuition Check
An engine run-up is not just starting the engine. It is a controlled power check done before takeoff to confirm the engine is ready for flight.
Example Sentence 1
After taxiing to the run-up area, the pilot completed the engine run-up and noted a normal magneto check before calling for takeoff clearance.
Example Sentence 2
After completing the engine run-up, the pilot taxied onto the runway once all instruments showed normal readings.