Plain English Meaning

Small storage areas built into the structures that house the engines on some twin-engine airplanes. Pilots can put luggage or gear in them, but the weight has to be counted when working out how the airplane is loaded.

Full Definition

Storage compartments built into the engine nacelles of some multi-engine airplanes, used for stowing baggage or equipment. Items placed in nacelle lockers must be included in weight and balance calculations, as their location affects both total weight and the airplane's center of gravity.

Context Anchor

Seen in weight and balance data, loading charts, and preflight planning for some multiengine airplanes.

Derivation

Nacelle comes from the French word for a small boat or , originally describing the hung beneath an . In modern it refers to the around an engine. A locker is simply a lockable storage . Together: a storage compartment located inside the engine housing.