Definition
A type of aircraft fuselage construction in which the outer skin carries most or all of the structural loads, with little or no internal framework. The shape and strength of the structure come from the stressed skin itself, often supported only by formers and bulkheads that give the fuselage its cross-sectional shape.
Plain English
A fuselage design where the outer shell does the work of holding the aircraft together, instead of relying on an internal skeleton of beams and braces.
Context Anchor
Seen in airframe and fuselage construction discussions, especially when comparing older shell-type designs with semi-monocoque construction.
Derivation
From the French mono- (single) and coque (shell). The idea is a 'single shell' that is strong enough on its own to carry the loads, the way an eggshell holds its shape without anything inside it.
Why Pilots Care
Damage to the skin can weaken the entire structure, so pilots check for dents or cracks during preflight inspections.
Analogy
Think of an empty soda can. There is nothing inside holding it up, yet it is surprisingly strong because the thin metal shell carries the load. Crush the side of the can, though, and it collapses easily. A monocoque fuselage works on the same principle.
Intuition Check
Do not read monocoque as meaning the aircraft is made from one solid piece. Here it means the outer shell carries the main structural load.
Example Sentence 1
Early monocoque construction proved strong for its weight, but any damage to the skin could seriously weaken the entire fuselage.
Example Sentence 2
Mechanics reinforced the monocoque construction by carefully riveting new skin panels in place.