If the BPU is fully loaded, how long can the onboard fuel system sustain engine operation?

If the BPU is fully loaded, how long can the onboard fuel system sustain engine operation?

• A. 30 minutes
• B. 2 hours
• C. 1 hour
• D. 3 hours

Answer: (C)

The onboard fuel system endurance is determined by how much fuel is on hand and how quickly the engine uses it at the given load. When the BPU is fully loaded, the engine is drawing fuel at its maximum rate, so the available onboard fuel will run out after about an hour. This design provides enough time to transfer to external fuel or complete a safe shutdown. Shorter times would be insufficient for full-load operation, and longer times would require more fuel than is onboard.

The onboard fuel system endurance is determined by how much fuel is on hand and how quickly the engine uses it at the given load. When the BPU is fully loaded, the engine is drawing fuel at its maximum rate, so the available onboard fuel will run out after about an hour. This design provides enough time to transfer to external fuel or complete a safe shutdown. Shorter times would be insufficient for full-load operation, and longer times would require more fuel than is onboard.