What is the maximum duration for dry motoring the first engine?

The maximum duration for dry motoring the first engine is 90 seconds. This limit is established to prevent excessive wear and heat buildup in the engine components during the dry motoring process. Prolonged dry motoring could lead to potential damage or failure of the engine due to insufficient lubrication, as the engine is not operating under normal conditions where fuel would typically be introduced for combustion.

This restriction is an important aspect of engine maintenance and operational procedures, ensuring the longevity and reliability of the engine. The practice of limiting dry motoring time reflects a well-considered balance between necessary checks on engine function and the prevention of damage, ensuring that the engines can be relied upon when actual operation is required.