The amber OIL PX annunciator illuminates when sensed oil pressure is between which two psi values at idle?

The amber OIL PX annunciator is a critical indicator for monitoring oil pressure in an aircraft's engine. This particular annunciator illuminates when the sensed oil pressure falls within a specific range to alert pilots of potentially insufficient oil pressure, which can lead to engine performance issues or failure.

The correct psi range for the amber OIL PX annunciator to illuminate is between 15 and 40 psi at idle. This specific range is established based on the engine's operational parameters, indicating that while the oil pressure is within this threshold, it is not at ideal levels. The amber light serves as a warning to pilots to take necessary actions, such as monitoring the situation closely, preparing for a potential engine issue, or considering engine shutdown procedures if necessary.

Choosing the range of 15 to 40 psi makes sense as it provides a clear buffer zone below the acceptable pressure levels, ensuring that any oil pressurization issue is highlighted early enough to allow for corrective measures. Thus, this range adequately supports the safety and operational integrity of the engine during critical phases of flight.