Where do the lube oil pumps take suction from in the propulsion lubrication system?

Where do the lube oil pumps take suction from in the propulsion lubrication system?

• A. Reduction Gear Sump
• B. Main Fuel Oil Tank
• C. Scavenge Pump
• D. Lube Oil Header

Answer: (A)

In propulsion lubrication, the pump that pressurizes and distributes oil draws from the reduction gear sump. This sump is the central reservoir that collects oil after it has lubricated the gears and bearings in the reduction gear box. The pumps pull from this sump to circulate oil through filters, coolers, and the lube oil header to the bearings and gears. Oil returns from the bearings and gear areas to the sump via scavenger pumps, completing the loop. The lube oil header is simply the distribution path after filtration, not the suction source, and the main fuel oil tank is unrelated to the lubrication system.

In propulsion lubrication, the pump that pressurizes and distributes oil draws from the reduction gear sump. This sump is the central reservoir that collects oil after it has lubricated the gears and bearings in the reduction gear box. The pumps pull from this sump to circulate oil through filters, coolers, and the lube oil header to the bearings and gears. Oil returns from the bearings and gear areas to the sump via scavenger pumps, completing the loop. The lube oil header is simply the distribution path after filtration, not the suction source, and the main fuel oil tank is unrelated to the lubrication system.