Section 150.504 - When must the operator service and examine lifeboat and rescue boat launching appliances?(a) The operator must service launching appliances for lifeboats and rescue boats at intervals recommended in the manufacturer's instructions under § 150.502(a) , or according to the deepwater port's planned maintenance program under § 150.502(b) .(b) The operator must thoroughly examine launching appliances for lifeboats and rescue boats at intervals of not more than 5 years. Upon completion of the examination, the operator must subject the winch brakes of the launching appliance to a dynamic test.