If the OIL PX annunciator lights up and oil pressure is below 5 psi, what is the initial recommended action?

When the OIL PX annunciator illuminates and oil pressure drops below 5 psi, it indicates a potentially serious issue concerning the lubrication system of the aircraft. The correct and initial action is to check the OIL TRX circuit breaker. This step is crucial because if the oil pressure is low due to an electrical failure of the oil pressure transmitter, resetting or verifying the circuit breaker status may restore the oil pressure indication to normal levels.

If the circuit is indeed tripped, it could potentially resolve the issue without further complications. This approach aligns with standard troubleshooting procedures, where verifying electrical systems can sometimes rectify misleading indications before moving on to more drastic measures.

The other suggestions, while they may be part of overall procedures in other scenarios, are not appropriate as initial actions in this specific situation. For instance, the oil level check, although important, may not be relevant if the circuit breaker is the cause of the low reading. Activating emergency procedures would typically follow if further indicators confirmed a significant risk to flight safety since it is not yet certain that the aircraft is in an emergency state. Continuing flight without addressing the annunciator could lead to severe damage or failure if the issue is severe. Hence, checking the OIL TRX circuit breaker is the