How long can the engine be operated using only the engine-driven high-pressure fuel pump?

• A. 5 hours
• B. 10 hours
• C. 15 hours
• D. 20 hours

Answer: (B)

The engine can be operated using only the engine-driven high-pressure fuel pump for a maximum duration of 10 hours. This specific time limit is in place to ensure proper fuel flow and system reliability during flight operations. Continuous reliance solely on the engine-driven pump beyond this time could risk fuel starvation or insufficient pressure, leading to potential engine performance issues.

Understanding this limitation is critical for flight safety and operational planning. When pilots or maintenance personnel are aware of the 10-hour operating threshold, they can effectively manage fuel system monitoring and take preemptive actions should the fuel pump fail or show signs of trouble during sustained operation. Moreover, this knowledge helps establish protocols for engine management and system checks, especially during longer missions where fuel delivery mechanisms might need to be scrutinized more tightly.