What does it indicate when both red and amber OIL PX annunciators illuminate while oil pressure is normal?

The illumination of both red and amber OIL PX annunciators while oil pressure remains normal indicates a potential failure in the SCU (Sensor Control Unit). This situation suggests that the SCU may not be providing accurate readings or is experiencing a fault that affects the oil pressure monitoring system.

In this scenario, despite the oil pressure being within the normal range, the malfunction of the SCU triggers the warning lights, alerting the pilot to check for possible issues that could affect engine performance or safety. Understanding this is crucial for pilots as it directly relates to engine health and ensures appropriate actions can be taken to maintain flight safety.

While low oil levels, normal operational conditions, or electrical malfunctions could also theoretically cause warnings, they do not specifically relate to the simultaneous illumination of both annunciators in the context of normal oil pressure.