Definition
The individual elements or pieces that together make up a larger system, structure, or assembly. In an aviation context, component parts refers to the discrete items — such as engines, propellers, control surfaces, instruments, or airframe sections — that combine to form a complete aircraft or subsystem.
Plain English
The separate pieces that, when put together, make up the whole thing.
Context Anchor
Seen in FAA discussions about aircraft design, approval, maintenance, and the parts that make up an airplane.
Derivation
From Latin componere, 'to put together' (com- 'together' + ponere 'to place'). A component part is therefore literally a part that has been placed together with others to form a whole — which matches how the FAA uses it when describing aircraft built from many certified pieces.
Why Pilots Care
Pilots do not usually approve or repair component parts, but they do rely on those parts being correct, safe, and properly maintained before flight.
Intuition Check
Do not read “component parts” as just random spare parts in a box. In this FAA context, it means the parts that make up, or are meant to make up, an aircraft or one of its systems.
Example Sentence 1
The mechanic inspected each of the engine's component parts before signing off the annual.
Example Sentence 2
FAA certification requires that all component parts of the fuel system be tested for reliability under flight loads.