The forward supporting structure of the engine provides the drive gears for which items?

• A. Starter/generator, N1 fuel control/pump and oil pump
• B. Axial Compressor Assembly
• C. Power Turbine
• D. Transmission Shaft

Answer: (A)

The thing being tested is how the engine uses its forward frame to power accessories. The forward supporting structure houses the accessory drive gearbox, which provides the gears that drive engine accessories. This gearbox is driven by the engine core and powers items such as the starter/generator, the N1 fuel control/pump, and the oil pump. The starter needs to spin the engine to start, the fuel control/pump supplies fuel, and the oil pump circulating lubrication—all of which rely on that forward-frame gearbox.

The axial compressor assembly and the power turbine are part of the core rotating path, driven by the turbine and connected to the main shafts—not by the forward accessory drive. The transmission shaft isn’t the function served by this forward-structure gearbox, either.