Final answer:
The HYD PANEL fault light may remain on after turning off the ENG 1(2) PUMP pushbutton if there's a residual system fault, such as low fluid, overheat, or pump failure, indicating the need for maintenance.
Step-by-step explanation:
The HYD PANEL fault light on an aircraft's hydraulic system may remain illuminated after an ENG 1(2) PUMP pushbutton is turned off if there is a residual system fault or condition that warrants attention. This could be due to a number of reasons, such as low fluid level, system overheat, or pump failure. Despite turning the pump off, if the underlying issue is not resolved, the fault light will stay on to alert the crew of the persisting problem. It is important for maintenance personnel or the crew to troubleshoot and rectify the issue to ensure the hydraulic system's integrity and proper function.
The fault light on the HYD panel will remain illuminated even after the ENG 1(2) PUMP pushbutton is selected to off when there is a fault in the hydraulic system that is unrelated to the pump.
The fault light on the HYD panel will remain illuminated even after the ENG 1(2) PUMP pushbutton is selected to off when there is a fault in the hydraulic system that is unrelated to the pump. In other words, the fault light indicates a problem with the hydraulic system as a whole, not just with the pump itself.
For example, if there is a leak in the hydraulic lines or a malfunction in a valve, the fault light will stay illuminated regardless of the pump's status. Turning off the pump will not resolve the underlying issue.