Definition
A description of fuel tanks (or other components) that are built directly into the wing itself rather than installed as separate, removable units. The wing's internal structure — its skin, ribs, and spars — forms the walls of the tank, sealed to hold fuel.
Plain English
It means the part is built into the wing as one piece, not added in afterward. The wing itself acts as the container.
Context Anchor
Seen in discussions of wing design, wing construction, fuel storage in wings, and aircraft maintenance or inspection.
Derivation
Integral' comes from the Latin integer, meaning 'whole' or 'untouched.' Something integral is part of the whole — not separate from it. So an integral fuel tank is one that is part of the wing, not a separate tank bolted inside it.
Why Pilots Care
Knowing fuel is stored inside the wing structure itself — not in a removable bladder or container — helps pilots understand why wing damage, leaks, or inspections directly affect fuel containment.
Analogy
Think of an ice cube tray: the walls of the tray are the container. An integral wing tank works the same way — the wing's own walls hold the fuel, with no separate cup inside.
Intuition Check
Integral does not only mean “important” here. It means built into the wing and part of the wing’s physical structure.
Example Sentence 1
On many aircraft, the fuel tanks are an integral part of the wing's structure, with the wing skin itself forming the tank walls.
Example Sentence 2
Ribs maintain the airfoil shape and serve as an integral part of the wing's structure.