The lube oil system shown in the illustration, consists of which of the following sub-systems? Illustration GT-0024

Correct Answer: Option D — All of the above.

A complete gas turbine lube oil system integrates scavenging, sump venting, and supply subsystems. The supply system delivers oil to bearings, the scavenging system recovers it, and the venting system manages pressure and air separation, collectively ensuring continuous lubrication and cooling required for reliable operation under high thermal and mechanical loads.