What is the Airframe Mounted Accessory Drive (AMAD)?

What is the Airframe Mounted Accessory Drive (AMAD)?

• A. A set of hydraulic pumps
• B. Two interchangeable gearboxes, each mechanically connected to an engine by a power transmission shaft (PTS).
• C. An electric motor assembly
• D. A single rigid gear chain

Answer: (B)

The AMAD is the power interface that drives the aircraft’s engine accessories by transferring shaft power from the engine to gearboxes mounted on the airframe. On the Growler, there are two interchangeable gearboxes, each driven through a power transmission shaft from the engine. These gearboxes then drive the accessories such as hydraulic pumps, generators, and the starting system. Having two gearboxes provides redundancy and maintenance flexibility, allowing a failed unit to be swapped or serviced without pulling the engine. The other options describe components or arrangements that aren’t how the AMAD is structured.

The AMAD is the power interface that drives the aircraft’s engine accessories by transferring shaft power from the engine to gearboxes mounted on the airframe. On the Growler, there are two interchangeable gearboxes, each driven through a power transmission shaft from the engine. These gearboxes then drive the accessories such as hydraulic pumps, generators, and the starting system. Having two gearboxes provides redundancy and maintenance flexibility, allowing a failed unit to be swapped or serviced without pulling the engine. The other options describe components or arrangements that aren’t how the AMAD is structured.