A steady OIL FILTER BYPASS alert indicates which condition?

• A. An impending bypass of the scavenge oil filter
• B. Low oil pressure
• C. Oil temperature high
• D. Filter clogging

Answer: (A)

In a lubrication system, filters protect the bearings by removing contaminants, but a bypass path is provided so oil can keep circulating if the filter is blocked or the pressure across it becomes too high. A steady OIL FILTER BYPASS alert means the bypass path is being used and the system is prioritizing keeping oil flow over filtration. That points to the condition where the filtering capability is being bypassed to prevent oil starvation, i.e., an impending bypass of the scavenge oil filter.

This is distinct from a simple low oil pressure warning, which signals inadequate oil pressure overall, or an oil temperature alert, which relates to heat rather than filtration. It’s also more specific than just “filter clogging,” because the alert indicates the bypass route is active rather than only noting a clogged element.