What is the required quantity of fluid for the IGB and TGB combined?

The correct answer indicates that the combined required quantity of fluid for the Intermediate Gearbox (IGB) and the Tail Gearbox (TGB) is 2.75 quarts. This value is critical for maintaining optimal lubrication and cooling within these gearboxes, which are essential for the helicopter's transmission system.

Maintaining the correct fluid level in the IGB and TGB helps ensure that the gears operate smoothly, reduces friction, and minimizes wear on the components. Insufficient lubrication can lead to overheating and potential failure of the gearboxes, which can compromise the aircraft's performance and safety.

While other specified quantities may relate to different components or systems within the helicopter, the 2.75 quarts requirement reflects the specific design and operational needs of the IGB and TGB in the MH-60S, making it essential for successful flight operations and maintenance protocols.