What is the purpose of the foam-lined wing tanks?

• A. To reduce weight
• B. To self-seal holes or damage, decreasing fire and explosion hazards.
• C. To increase fuel capacity
• D. To improve aerodynamics

Answer: (B)

Foam-lined wing tanks are meant to reduce fire risk after damage by acting as a self-sealing layer. When a hole or puncture occurs, the foam helps seal the opening and slows or stops fuel leakage, which in turn lowers the amount of fuel that can reach hot surfaces or ignite. This also reduces the spread of fire and the potential for explosions by keeping fuel contained and cooling the area. It’s not about shedding weight, increasing fuel capacity, or improving aerodynamics—the lining’s main value is safety and fire suppression after damage.