Plain English Meaning

The engine and everything attached to it that makes the aircraft go. It is not just the engine alone, but the whole working package that produces the power to fly.

Full Definition

The complete engine installation on an aircraft, including the engine itself and all the accessories needed to make it run and produce thrust or power. This typically includes the engine, propeller (on propeller-driven aircraft), engine mounts, cowling, fuel and oil systems, ignition system, starter, and exhaust system.

Context Anchor

You will see this term in aircraft systems, maintenance records, preflight inspection, and discussions of engine operation.