Definition
The portion of a turbine engine or auxiliary power unit (APU) that produces shaft power or thrust through the gas-generator process — that is, the compressor, combustion chamber(s), and turbine(s) working together to draw in air, burn fuel, and extract usable energy. In a turboprop or turboshaft engine, the power section is often distinguished from the reduction gearbox and accessory section; in an APU, it is distinguished from the load compressor and accessory drives.
Plain English
The part of a turbine engine that actually makes the power — where air is compressed, fuel is burned, and the hot gases drive the turbine.
Context Anchor
Seen in aircraft engine descriptions, maintenance manuals, and discussions that divide an engine into major sections.
Derivation
Power comes from a Latin word meaning ability or capacity. Section comes from a Latin word meaning to cut. Together, power section means the cut-out or identified part of the engine whose job is to make power.
Why Pilots Care
Understanding this section is essential for diagnosing power loss, performing cylinder work, and following correct engine disassembly sequences during maintenance.
Intuition Check
Do not read “power section” as an electrical area or a cockpit power setting. Here it means a physical section of the engine that makes usable mechanical power.
Example Sentence 1
During the start sequence, the pilot monitored the power section temperature to ensure it stayed within limits.
Example Sentence 2
Low compression readings pointed to a problem inside the power section.