What are the characteristics of the scavenge pumps in the oil system?

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The choice of two internal and two external scavenge pumps accurately reflects the configuration of the oil system in the TH-73 helicopter. Scavenge pumps play a crucial role in the lubrication system by ensuring that the oil is effectively collected from various parts of the engine and returned to the oil reservoir.

Having two internal scavenge pumps allows for efficient collection of oil from the engine components, while the two external pumps are designed to manage the flow from the oil cooler and reservoir back to the engine. This configuration helps maintain optimal oil pressure and circulation, essential for effective lubrication and cooling of engine components.

This strategic arrangement of pumps provides redundancy and ensures that even if one pump encounters an issue, the oil system can still function effectively, which is critical for maintaining the reliability and safety of the helicopter's operation.