Where is the accessory drive housing assembly located?

Where is the accessory drive housing assembly located?

• A. Forward bottom side of the engine, attached to the air inlet housing
• B. Forward bottom side of the engine, attached to the exhaust housing
• C. Aft bottom side of the engine, attached to the air inlet housing
• D. Forward top side of the engine, attached to the air inlet housing

Answer: (C)

The accessory drive housing assembly is the platform that carries the gear train for all engine accessories (fuel pump, hydraulic pump, starters, generators, etc.) and it must be mounted where it can be reliably driven by the engine and easily serviced. Placing it on the bottom of the engine, toward the aft side and attached to the air inlet housing, provides a sturdy, accessible mounting linked to the forward structure that supports the intake. This location keeps the drive from interfering with the intake airflow and hot exhaust, allows gravity-assisted lubrication drainage, and keeps the accessories aligned with the drive shaft path coming from the front of the engine. In short, the aft bottom position attached to the air inlet housing supports proper drive geometry, accessibility, and reliable operation of the accessory system.

The accessory drive housing assembly is the platform that carries the gear train for all engine accessories (fuel pump, hydraulic pump, starters, generators, etc.) and it must be mounted where it can be reliably driven by the engine and easily serviced. Placing it on the bottom of the engine, toward the aft side and attached to the air inlet housing, provides a sturdy, accessible mounting linked to the forward structure that supports the intake. This location keeps the drive from interfering with the intake airflow and hot exhaust, allows gravity-assisted lubrication drainage, and keeps the accessories aligned with the drive shaft path coming from the front of the engine. In short, the aft bottom position attached to the air inlet housing supports proper drive geometry, accessibility, and reliable operation of the accessory system.