What must be done to lifeboat falls every 30 months?

Lifeboat falls must be end-for-ended every 30 months to ensure that wear and stress are evenly distributed along the length of the falls. By swapping the ends of the falls, you can extend their lifespan and prevent localized wear from becoming significant enough to compromise their strength or functionality. This practice helps maintain the integrity of the falls over time, as it distributes wear that naturally occurs during use.

The other options do not align with the established requirements for maintenance of lifeboat falls. While testing for wear and replacing falls are important practices, the specific action mandated at the 30-month interval is to end-for-end them. Lubrication, though beneficial in some scenarios, is not a prescribed maintenance action for lifeboat falls at this interval. Thus, end-for-ending falls is a crucial step in maintaining the overall safety and reliability of lifeboat operations.