What does a Red [OIL PX] annunciator indicate during operation?

The Red [OIL PX] annunciator serves as a critical warning to operators regarding the oil pressure levels within the system. When this light is illuminated, it indicates that the oil pressure has dropped to 15 psi or below while the engine is at idle. This condition is crucial because low oil pressure can lead to insufficient lubrication of engine components, potentially causing serious damage if not addressed promptly.

Maintaining adequate oil pressure is essential for the healthy functioning of the engine. The specific threshold of 15 psi is significant; anything at this level or lower suggests that the engine may not be receiving the necessary oil flow, which can compromise engine performance and longevity. Recognizing this alert allows operators to take immediate corrective action, such as checking the oil levels or consulting maintenance procedures, to ensure the engine's protection and operational safety.