Plain English Meaning
The part of the aircraft's handbook that explains, in plain terms, what each system on the airplane does and how the pilot uses it. It is the section a pilot reads to learn how their specific airplane actually works.
Full Definition
A written explanation, normally found in Section 7 of the Pilot's Operating Handbook (POH) or Aircraft Flight Manual (AFM), that describes how each major system on a specific aircraft is built, how it works, and how the pilot operates it. Typical systems covered include the airframe, powerplant, propeller, fuel system, electrical system, hydraulic system, , , and , , and any or protection equipment installed.