What potential hazard is associated with using excessive pressure when emptying aircraft lavatory waste tanks?

The potential hazard associated with using excessive pressure when emptying aircraft lavatory waste tanks is the risk of causing a rupture or damage to the aircraft's lavatory system or the servicing equipment, leading to a spill of hazardous waste. Aircraft lavatory systems are designed to withstand a certain amount of pressure during servicing. Using excessive pressure can overstress the tanks, hoses, or valves, causing them to crack, leak, or burst. This can result in a spill of lavatory waste, which poses a health hazard to personnel and can damage the aircraft. The high pressure can also damage the lavatory service truck's equipment. Therefore, it is essential to use the correct pressure settings and follow the manufacturer's instructions to prevent damage and spills.