What happens if the OIL PX warning annunciator illuminates after initially extinguishing during the start sequence in cold temperatures?

If the OIL PX warning annunciator illuminates after initially extinguishing during the start sequence in cold temperatures, the correct approach is to determine whether the oil pressure rises. This situation can occur as the oil warms up and its viscosity decreases, potentially allowing for improved circulation and pressure in the system. If the oil pressure indeed rises to a normal operating range, continued operation of the aircraft is permissible.

Monitoring the oil pressure closely during this period is essential, as oil pressure is a critical parameter for the safe operation of the engine. In cold temperatures, the initial oil pressure may be lower due to the increased viscosity of cold oil, leading to momentary warnings. If the pressure stabilizes within the normal limits, it confirms that the oil system is functioning correctly, and the aircraft can be operated safely.