Which component regulates the engine speed in the fuel metering unit?

The component that regulates the engine speed in the fuel metering unit is the Ng governor. The Ng governor is a critical part of the engine control system. It continuously monitors the speed of the gas generator section of the engine and adjusts the fuel flow accordingly to maintain a desired engine speed.

When the engine speed deviates from the target, the Ng governor makes adjustments to the fuel flow to bring the engine speed back to the desired level. This regulation is essential for safe and efficient engine operation, helping to prevent over-speed conditions and ensuring that the engine performs within its operational limits.

Other components, such as the fuel flow divider and fuel valve, play important roles in managing how fuel is distributed to various parts of the engine, but they do not directly control the engine speed. The 3D cam is involved in the relationship between fuel flow and engine power settings but lacks the direct regulatory capability that the Ng governor provides for engine speed management.