The passages and tubing in the accessory drive train are used for what function?

• A. Lubrication of the accessory drive train
• B. Fuel distribution
• C. Cooling of the turbine
• D. Air circulation

Answer: (A)

The passages and tubing in the accessory drive train are there to lubricate the drive train. They carry oil from the engine’s lubrication system to the gear train bearings and gears, creating a protective film that reduces wear and helps carry away heat. This lubrication is essential for reliable operation of the accessories driven by the gear train, such as pumps and generators. Without this oil flow, the bearings would overheat and wear quickly, risking failure.

Fuel distribution, turbine cooling, and air circulation are handled by other systems and paths, not by the accessory drive train’s oil passages. Fuel distribution is managed by the fuel system, cooling of the turbine by its dedicated cooling paths, and air circulation by ventilation and cooling circuits.