Which pump is responsible for returning oil to the cooler from the reduction gearbox?

The scavenger pump is responsible for returning oil to the cooler from the reduction gearbox in the Pilatus PC-12 NG. Its primary function is to collect the oil that has circulated through the engine and gearbox systems, where it has absorbed heat and contaminants, and then to return it to the oil cooler for reconditioning. This process is crucial for maintaining optimal operating temperatures within the engine, as overheating can lead to mechanical failures.

Understanding the operation of the scavenger pump highlights its role in the overall lubrication system, ensuring that the oil system not only lubricates components but also maintains proper temperature control by cycling the oil through the cooler. This keeps the engine running efficiently, reduces wear and tear, and extends the life of the components involved.