Which accessory is not driven by the accessory drive housing?

Which accessory is not driven by the accessory drive housing?

• A. Fuel control unit
• B. Oil pump
• C. Starter motor
• D. Air inlet vein

Answer: (D)

The accessory drive housing provides mechanical power to engine accessories that must be driven from the engine, such as the fuel control unit, the oil pump, and the starter motor. These components rely on that drive to perform their functions: metering fuel, circulating oil, and starting the engine. The air inlet vane, however, is part of the compressor’s air intake system and is actuated by its own control mechanism rather than by the accessory drive. It adjusts airflow into the compressor independently of the accessory drive, so it is not driven by the accessory drive housing.

The accessory drive housing provides mechanical power to engine accessories that must be driven from the engine, such as the fuel control unit, the oil pump, and the starter motor. These components rely on that drive to perform their functions: metering fuel, circulating oil, and starting the engine. The air inlet vane, however, is part of the compressor’s air intake system and is actuated by its own control mechanism rather than by the accessory drive. It adjusts airflow into the compressor independently of the accessory drive, so it is not driven by the accessory drive housing.