Definition
The manufacturer's specified power output limits an engine is approved to produce under defined operating conditions, including the maximum power, the RPM, manifold pressure, fuel flow, and time limits at which that power may be used. Common ratings include takeoff power (often time-limited), maximum continuous power, and maximum cruise power.
Plain English
The official numbers that say how much power an engine can produce, at what settings, and for how long. Each rating has its own limits the pilot must respect.
Context Anchor
Seen in aircraft engine specifications, the pilot’s operating handbook, engine operating limits, and maintenance records.
Derivation
“Engine” comes from an older word meaning a device or machine. “Rating” comes from the idea of setting an amount or value. In this term, a rating is an assigned approved power value, not a review or opinion about how good the engine is.
Why Pilots Care
Ensures safe engine operation and prevents overstress or failure by defining allowable power settings.
Intuition Check
Do not read “rating” as a quality score, like a five-star rating. Here it means an approved power level with conditions and limits attached.
Example Sentence 1
The pilot reduced power to the maximum continuous rating after the five-minute takeoff limit expired.
Example Sentence 2
Exceeding the continuous engine rating can lead to overheating and reduced engine life.