After how many seconds will the SCU trigger the OIL PX annunciators if oil pressure is insufficient?

The SCU (System Control Unit) is designed to monitor the oil pressure in an engine system. When oil pressure drops below a predefined threshold, the SCU is programmed to trigger the OIL PX annunciators to alert the crew of the insufficient oil pressure condition. This trigger occurs after a short delay to confirm that the oil pressure anomaly is sustained and not just a transient fluctuation.

In this case, the correct answer indicates that the SCU will initiate the warning about insufficient oil pressure after just 5 seconds. This relatively brief time frame ensures that any potential issue can be conveyed to the crew promptly, allowing them to take necessary actions to safeguard the system and ensure operational safety.

The other options represent longer delays, which would not align with the operational requirement for timely alerts regarding critical systems like oil pressure. An effective response to engine performance notices, especially concerning oil pressure, calls for immediate recognition due to the potential consequences of low oil pressure on engine health and performance.