What is a key difference between pneumatic and hydraulic actuation in aircraft systems?

What is a key difference between pneumatic and hydraulic actuation in aircraft systems?

• A. Hydraulic is slower but provides higher force and precise control.
• B. Pneumatic is faster and simpler but less precise.
• C. Pneumatic provides higher force and precision.
• D. Hydraulic is faster and simpler but less precise.

Answer: (B)

Pneumatic actuation is faster and simpler but less precise because air is compressible, so the system is lightweight and quick to move, yet the force and position under load can vary due to air compression. Hydraulic actuation uses incompressible fluid, which delivers higher force with tighter, more predictable control, but the system is more complex and heavier. That trade-off is why pneumatic systems are chosen for fast, simple motion, while hydraulics are favored when high force and precision are needed.

Pneumatic actuation is faster and simpler but less precise because air is compressible, so the system is lightweight and quick to move, yet the force and position under load can vary due to air compression. Hydraulic actuation uses incompressible fluid, which delivers higher force with tighter, more predictable control, but the system is more complex and heavier. That trade-off is why pneumatic systems are chosen for fast, simple motion, while hydraulics are favored when high force and precision are needed.