What is the Dry Motoring Cycle Limit for the first engine?

The Dry Motoring Cycle Limit for the first engine is understood as a specific operational guideline to prevent overheating and ensure safe engine function during ground testing. The correct answer indicates that the dry motoring cycle allows for a maximum duration of 90 seconds of continuous cranking followed by a cooling period of 5 minutes.

This timing is crucial because it enables the engine components, such as the starter and electrical systems, to operate safely without overheating during a dry motoring event, which simulates engine operation without fuel or ignition. The prolonged 90 seconds allows for thorough checks of the engine's systems and performance under specified conditions, while the 5-minute cooling period ensures adequate heat dissipation, making it an appropriate protocol to maintain engine integrity and reliability.