What does HLSB indicate?

What does HLSB indicate?

• A. Lock unlock shaft
• B. Hot line shaft bearing
• C. Hot bearing main reduction gear
• D. Loss of oil pressure in L/O

Answer: (B)

HLSB signals a hot line shaft bearing condition. The line shaft runs from the main engine to the propeller, supported by bearings in the stern area. When that bearing overheats, it points to issues like insufficient lubrication, abnormal load, misalignment, or bearing wear. Treat it as a warning to reduce propulsion effort, verify lubrication oil pressure and temperature, ensure bearing cooling, and inspect for leaks or damage. It isn’t about a lock/unlock function, a hot bearing on the reduction gear, or a loss of oil pressure in the lubrication system.

HLSB signals a hot line shaft bearing condition. The line shaft runs from the main engine to the propeller, supported by bearings in the stern area. When that bearing overheats, it points to issues like insufficient lubrication, abnormal load, misalignment, or bearing wear. Treat it as a warning to reduce propulsion effort, verify lubrication oil pressure and temperature, ensure bearing cooling, and inspect for leaks or damage. It isn’t about a lock/unlock function, a hot bearing on the reduction gear, or a loss of oil pressure in the lubrication system.