What are the main functions of the lubrication system in a gas turbine?

• A. Filter contaminants.
• B. Remove heat.
• C. Lubricate moving parts.
• D. Supply clean oil at proper pressure to bearings/gearboxes, remove heat, lubricate moving parts, filter contaminants, and provide chip detection.

Answer: (D)

The lubrication system in a gas turbine has several integrated roles that protect bearings and gearboxes and keep the engine running smoothly. It must supply clean oil at the proper pressure to bearings and gearboxes so a protective lubricating film is always present, reducing wear and preventing metal-to-metal contact. It also removes heat from critical components by circulating oil through coolers, helping maintain the oil’s viscosity and the overall temperature of the gear train and bearings. Lubrication of moving parts is essential to minimize friction and wear in bearings, gears, seals, and related components. Filtration is another key function, removing contaminants from the oil to prevent abrasive particles from causing damage. Finally, chip detection provides a troubleshooting signal—magnetic plugs or sensors can detect metallic particles that indicate abnormal wear or damage. Taken together, these functions cover the full scope of what the lubrication system must do, which is why the all-encompassing option is the best choice.