159. On a ship equipped with a gravity type lube oil system, which of the conditions listed will occur FIRST if the main lube oil pump discharge pressure is lost?

Loss of main lube oil pump pressure initially triggers a low-pressure alarm to alert the engineer before gravity feed or complete pressure loss occurs. The alarm system is designed to activate before bearings are deprived of oil, and the gravity tank provides temporary lubrication during rundown, preventing immediate total loss of bearing oil pressure.