Which material property is necessary for high-pressure hydraulic lines used in aircraft landing gear and flaps?

Which material property is necessary for high-pressure hydraulic lines used in aircraft landing gear and flaps?

• A. High strength and abrasion resistance
• B. Low density
• C. Thermal insulation
• D. Color

Answer: (A)

High-pressure hydraulic lines must withstand substantial internal pressure and the wear and flexing that occur as they route around the aircraft’s structures. The material needs to be strong enough to resist bursting under pressure and tough enough to resist abrasion from movement, fittings, and contact with nearby components. This combination—high strength to handle the fluid pressure and abrasion resistance to survive wear—keeps the lines safe and leak-free in critical systems like landing gear and flaps. While low density (weight reduction) or thermal insulation can be desirable in some designs, they don’t address the essential requirement for safely carrying high-pressure fluid. Color is not relevant to performance.

High-pressure hydraulic lines must withstand substantial internal pressure and the wear and flexing that occur as they route around the aircraft’s structures. The material needs to be strong enough to resist bursting under pressure and tough enough to resist abrasion from movement, fittings, and contact with nearby components. This combination—high strength to handle the fluid pressure and abrasion resistance to survive wear—keeps the lines safe and leak-free in critical systems like landing gear and flaps. While low density (weight reduction) or thermal insulation can be desirable in some designs, they don’t address the essential requirement for safely carrying high-pressure fluid. Color is not relevant to performance.