What could cause erratic oil pressure indications in a gas turbine?

Erratic oil pressure indications in a gas turbine can primarily be attributed to possible leaks or pump failure. When there are leaks in the oil system, it leads to a reduction in the amount of oil within the system, which can cause inconsistent pressure readings. Additionally, if the oil pump is failing or not functioning correctly, it may not supply a consistent flow of oil, which is crucial for maintaining stable oil pressure. The pump must create a specific pressure to ensure proper lubrication and cooling within the engine. If this pressure is compromised due to pump issues or leaks, the oil pressure gauge may show erratic or fluctuating readings, leading to potential confusion regarding the engine's health.

In contrast, while excessive engine load can affect oil pressure, it typically leads to a consistent drop in pressure rather than erratic fluctuations. Low ambient temperatures might also influence oil viscosity and flow but are less likely to cause erratic indications unless the oil is significantly thickened. Incorrect oil viscosity can cause issues with lubrication efficiency but would not typically lead to erratic measurements unless the oil is completely unsuitable for the operating conditions. Thus, the most direct causes of erratic oil pressure readings are leaks or pump failure, which fundamentally affect the delivery and measurement of oil pressure within the turbine.