What light is indicated if oil pressure is at or below 15 psi at IDLE?

When oil pressure is at or below 15 psi at idle, the correct indication is the red "OIL PX" light. This light signifies a critical situation concerning the oil pressure in the engine system. Typically, a red light in aviation and vehicle systems indicates a serious issue that requires immediate attention. In this scenario, low oil pressure can lead to inadequate lubrication, resulting in potential engine damage if not addressed promptly.

The threshold of 15 psi is a significant marker that indicates the need to investigate further and take corrective action, such as reducing power settings or preparing for a possible emergency landing, depending on the situation. Recognizing this light's implication is vital for the safety and integrity of the engine operation. Other light indicators, such as amber "OIL PX," are typically used for cautionary alerts rather than indicating immediate danger, making the red "OIL PX" light the appropriate signal for critical low oil pressure conditions.