Components that are used with an engine, but are not a part of the engine itself. Units such as magnetos, carburetors, generators, and fuel pumps are commonly installed engine accessories.

• A. Accessories
• B. Subsystems
• C. Auxiliaries
• D. Gadgets

Answer: (A)

Engine accessories are components used with an engine but not part of the engine itself. They include magnetos, carburetors, generators, and fuel pumps—devices mounted on or driven by the engine that support its operation (ignition, fuel delivery, electrical power) while staying outside the engine’s core mechanism. This is the standard aviation term for those items. Subsystems implies a larger, integrated grouping; auxiliaries is less precise, and gadgets is informal and not used in technical contexts.