How many hours is operation with only the engine-driven high-pressure fuel pump limited to?

The operation with only the engine-driven high-pressure fuel pump is limited to a maximum of 10 hours. This limitation is critical for safety and reliability reasons, as extended operation under these conditions could lead to fuel system issues, inadequate fuel delivery, or potential engine performance problems.

In the T-6A, the engine-driven high-pressure fuel pump is a vital component that supplies fuel at the necessary pressure for combustion. If the aircraft were to operate without backup systems or in a configuration that restricts redundancy, it is essential to limit the duration of operation to mitigate risks associated with pump failure or degraded performance. The 10-hour limit ensures that pilot and aircraft safety is prioritized during training and operational flight scenarios.

Understanding this limitation helps in the maintenance planning and operational decision-making required for safe flight practices.