On the gas turbine engine lube oil system shown in the illustration, air and oil are primarily separated in the air/oil separator through the use of which of the following? Illustration GT-0024

Correct Answer: Option B — Impeller

The air/oil separator utilizes a high-speed impeller to impart centrifugal force on the oil-laden air mixture. This force effectively separates the heavier oil droplets from the air, allowing the oil to return to the sump while the cleaned air is vented, maintaining proper sump pressure and preventing oil mist accumulation.