What are the three subsystems of the lubrication oil system?

The correct choice identifies the three essential subsystems of the lubrication oil system as lube supply, lube scavenge, and sump vent.

The lube supply subsystem is responsible for delivering oil to various components of the gas turbine, ensuring that vital areas are lubricated to reduce friction and wear. This system plays a critical role in maintaining the overall operational efficiency and longevity of the engine.

The lube scavenge subsystem collects the oil after it has been cycled through the turbine components. It returns the used oil to a central point, usually back to the lube tank or sump, where it can be filtered and reused. This process is vital to maintain proper oil circulation and to ensure that the system remains efficient and free of contaminants.

The sump vent subsystem allows for the release of any excessive pressure that may build up in the lubrication system and helps to prevent oil leaks. Maintaining proper venting is crucial for overall lubrication performance and air management within the oil system.

Each of these functions is integral to the lubrication process, which is essential for proper gas turbine operation. The other choices do not encapsulate these fundamental functions of the lubrication oil system accurately, as they propose combinations that do not align with the standard operational subsystems recognized in gas turbine