Definition
A structural design in which the outer skin and the underlying frame are combined into a single load-bearing shell, so the body itself carries the structural loads rather than relying on a separate internal frame.
Plain English
A one-piece shell where the skin and frame are built as one structure, and the shell itself holds everything together.
Context Anchor
Seen in discussions of monocoque aircraft construction and fuselage design.
Derivation
From 'uni-' (Latin for 'one') and 'body.' Literally 'one body' — the frame and skin are not two separate things bolted together, but one continuous structure.
Why Pilots Care
Understanding that the skin itself is structural explains why even minor dents, cracks, or skin damage on a unibody or monocoque aircraft must be taken seriously — the skin is not just a cover, it is part of what holds the aircraft together.
Analogy
Like an aluminum drink can: the thin outer wall is the structure. There is no internal frame holding the can's shape — the shell does the whole job.
Intuition Check
Unibody does not mean the aircraft is made from one solid piece. It means the body and support structure act together as one unit.
Example Sentence 1
The handbook compares the aircraft's monocoque construction to a car's unibody, where the outer shell carries the structural loads.
Example Sentence 2
Modern light aircraft often use unibody construction to reduce weight while maintaining strength.