To which component are the hydraulic pumps mounted?

• A. Engine AGB
• B. Engine RGB
• C. Transmission main case
• D. Oil cooler drive shaft

Answer: (C)

The hydraulic pumps are mounted to the transmission main case because this design allows for efficient integration and operation of the hydraulic systems within the aircraft. The transmission main case serves as a central component that houses various systems, including those responsible for the transmission of power and fluid energy.

Mounting the hydraulic pumps on the main case ensures that they can effectively draw the necessary hydraulic fluid for operation, utilizing the mechanical power generated by the engine and transmission systems. This configuration optimizes the performance and responsiveness of the hydraulic system, which is critical for various functions such as flight control and landing gear operations.

In contrast, other components like the engine accessory gearbox (AGB) or the engine reduction gearbox (RGB) primarily focus on different functions primarily related to engine performance and power delivery, rather than serving as mounting points for hydraulic operations. The oil cooler drive shaft is also not designated for this purpose as it primarily deals with the cooling system rather than hydraulic functions.