The assembly that houses the gearbox housing and cover, gas producer gear train, and power turbine gear train is the

• A. Fuel control assembly
• B. Combustor assembly
• C. Accessory gearbox assembly
• D. Starter motor assembly

Answer: (C)

The assembly being described is the accessory gearbox assembly. In a gas turbine, this unit sits on the engine and houses the gearbox itself as well as the gear trains that transfer power from both the gas producer (gas generator) and the power turbine to drive engine accessories. These gear trains provide the rotational input needed to run items like fuel pumps and oil pumps, keeping the engine’s auxiliary systems powered. Other options refer to different subsystems: the fuel control handles fuel metering, the combustor is the combustion chamber, and the starter motor is a separate item that starts the engine but does not encompass the gear trains and housing described.