What is the dry motoring cycle duration for the first start?

The dry motoring cycle duration for the first start is set at 90 seconds. This duration is a critical parameter, as it allows for the testing of engine components without fuel and ignition. The primary purpose of this cycle is to verify that the engine is properly cranking and that the various operational systems are functioning as expected before actual fuel introduction occurs.

In the context of engine operations, limiting the dry motoring to 90 seconds helps prevent overheating and potential damage to the starter and electrical systems. It ensures an appropriate balance between testing the engine's functionality and avoiding excessive stress on its components. Conducting the dry motoring cycle within this time frame provides sufficient time to assess the integrity and readiness of the engine for subsequent starts.

While other durations may be found in different contexts or practices, 90 seconds aligns specifically with standard procedures for the initial dry motoring cycle in this training.