What does the FUEL PX annunciator signify?

• A. Fuel tank is full.
• B. Fuel pressure is below 10PSI in the motive flow line.
• C. Fuel supply is normal.
• D. Fuel efficiency is high.

Answer: (B)

The FUEL PX annunciator specifically indicates a situation where the fuel pressure is below 10 PSI in the motive flow line. This pressure drop is critical because the motive flow line is responsible for supplying fuel to the engine. If the pressure falls below this threshold, it could compromise fuel delivery, leading to potential engine performance issues or failures. Such an alert is designed to prompt the pilot to take appropriate actions to ensure aircraft safety and fuel management.

In terms of operational awareness, understanding the significance of the FUEL PX annunciator allows pilots to respond effectively to fuel system anomalies, ensuring that the craft remains operational under safe parameters.