Except as provided by this section, all rescue boats shall comply with the
requirements of paragraphs 4.4.1 to 4.4.7.4 inclusive and 4.4.7.6, 4.4.7.7, 4.4.7.9,
4.4.7.10 and 4.4.9. A lifeboat may be approved and used as a rescue boat if it meets all
of the requirements of this section, if it successfully completes the testing for a rescue
boat required in regulation IIU4.2, and if its stowage, launching and recovery
arrangements on the ship meet all of the requirements for a rescue boat.