Frequently Asked Question

This either an intermittent electrical connection (intermittent short if the pressure drops, or intermittent open if the pressure increases), or the engine's oil pressure is actually fluctuating. Variations in the ground voltage between the EIS and the oil pressure sensor can also cause this problem. This is rare in aluminum airplanes, but can sometimes be seen in composite airplanes when the EIS shares the same ground path to the battery with other devices that can draw large currents.