What indication will the flight deck show if the hydraulic filter is bypassed?

When a hydraulic filter is bypassed, this is typically a design feature intended to ensure that the hydraulic system continues to function even if the filter becomes clogged. In such cases, the filter bypass mechanism allows unfiltered fluid to flow through the system to maintain hydraulic pressure and operational capability.

As part of this design, there may not be any direct indication on the flight deck showing that the hydraulic filter is bypassed. This is because, under normal operating conditions, the system is still functional, and the bypass does not necessarily interfere with the performance of the aircraft's hydraulic systems. Therefore, pilots would not see a warning light, hear an alarm, or notice an abnormal pressure gauge reading, as the system is designed to operate as normal without any alerts for the bypass condition.

Understanding how the hydraulic system operates and the implications of a filter bypass is crucial for pilots, as it informs them on the status of the aircraft's hydraulic capabilities without unnecessary alarms that could cause distraction or concern.