What does LLOPR indicate?

• A. Unusual noise or vibration
• B. Lock unlock shaft
• C. Loss of main reduction gear L/O pressure
• D. Major lube oil leak

Answer: (C)

LLOPR indicates a loss of main reduction gear lube oil pressure. In the propulsion gear train, the reduction gear needs a steady, pressurized supply of lube oil to lubricate bearings and gears and to carry away heat. When the pressure drops, lubrication becomes insufficient, risking bearing wear, overheating, or gear damage. That’s why this alarm demands prompt attention and often a quick check of the oil level, pump operation, and possible leaks or blockages, followed by the appropriate action per procedure. It’s more specific than a general unusual noise or vibration, and it’s about pressure in the lube oil system rather than a simple external leak or a lock/unlock shaft condition.