What differentiates integral cells from traditional fuel tanks?

• A. They are made solely from aluminum
• B. They are located outside the wings
• C. They are built into the structure of the wing
• D. They can only hold jet fuel

Answer: (C)

Integral cells are a type of fuel tank that are integrated into the structure of the wing itself, as opposed to traditional fuel tanks that are separate units that may be installed or removed. This design allows for a more efficient use of space within the aircraft. By incorporating fuel tanks into the wing structure, integral cells help to reduce overall weight and improve aerodynamics. Additionally, this configuration can lead to a more streamlined design and increased structural integrity, as the wing can be designed to support both aerodynamic and fuel-storage functions simultaneously.

The other choices either do not accurately describe integral cells or do not capture their defining feature. Integral cells can be constructed from various materials, not exclusively aluminum, and they are typically located within the wings rather than outside. Furthermore, integral cells are not limited to holding jet fuel, as they can be used for other types of aviation fuels as well. Thus, the defining characteristic of integral cells is their integration into the wing structure.