FAA Powerplant Written Practice Test

What significant input does a pilot provide for controlling fuel metering in an EFCU?

1. A Engine RPM reading

2. B Power lever angle

3. C Fuel pressure gauge

4. D Throttle position

The correct answer is: B Power lever angle

The power lever angle is crucial for controlling fuel metering in an EFCU (Electronic Fuel Control Unit) because it directly influences the amount of fuel supplied to the engine based on the pilot's demand for power. When the pilot adjusts the power lever, this changes the angle that signifies how much power is required, and the EFCU responds by modulating the fuel flow to match that demand. This adjustment allows the engine to maintain optimal performance and efficiency during various phases of flight, such as take-off, cruising, and landing. By providing this input, the pilot effectively communicates their power needs, allowing for precise fuel management and engine operation. While engine RPM readings, fuel pressure gauges, and throttle positions offer important information regarding engine performance and health, they do not directly dictate the fuel flow in the manner that power lever angle does. The power lever angle is a direct command input from the pilot, making it the most significant factor in fuel metering control by the EFCU.