Plain English Meaning

The main lengthwise beam inside a wing. It is the strong backbone that holds the wing together and carries the weight of the aircraft in flight.

Full Definition

The principal spanwise structural member of an aircraft wing, stabilizer, or control surface. The spar runs from root to tip and carries the bending and torsional loads created by lift, weight, and maneuvering forces. Ribs and skin attach to the spar to form the completed surface.

Context Anchor

Seen in aircraft structure descriptions, inspection reports, , and damage discussions.