Which of the following is NOT a function of the oil in an aircraft engine?

• A. Reduces friction.
• B. Seals and cushions.
• C. Uses electrical power to operate sensors.
• D. Removes heat.

Answer: (C)

Oil in an aircraft engine mainly lubricates moving parts to reduce friction, seals gaps and cushions surfaces, and carries heat away from hot components. The lubricating film minimizes wear, the oil fills clearances like piston rings to help seal against combustion gases, and it cushions by damping vibrations between bearings and gear interfaces. It also transfers heat from hot parts to the oil cooler, helping to keep the engine from overheating.

The statement that does not fit is that oil uses electrical power to operate sensors. Oil isn’t a power source; it doesn’t supply energy or power electronics. Sensors are powered by the aircraft’s electrical system (battery/alternator), not by the oil.