What does an ENG 1 PUMP or ENG 2 PUMP FAULT light indicate along with a PTU FAULT light?

The ENG 1 PUMP or ENG 2 PUMP FAULT light along with a PTU FAULT light indicates a potential issue related to the hydraulic pump system. Specifically, these lights suggest that there could be a problem with the hydraulic pumps themselves, which are crucial for providing the necessary hydraulic pressure for various aircraft systems.

Option D, indicating a hydraulic reservoir problem, is logical in this context because a failure in the hydraulic reservoir can lead to insufficient fluid levels or pressure, which would in turn cause the hydraulic pumps to malfunction. If the reservoir is not supplying adequate fluid, the pumps will be unable to function effectively, triggering the fault lights for both the engine pumps and the PTU (Power Transfer Unit).

By identifying that the issue stems from the hydraulic reservoir, maintenance crews can focus their troubleshooting efforts on ensuring proper fluid levels and reservoir integrity, which is essential for the safe operation of the hydraulic system. This ensures that any underlying problems are addressed, thereby maintaining the reliability and safety of the aircraft.