Section 172.133 - Character of damage(a) If a type I hull is required, design calculations must show that the vessel can survive damage at any location.(b) Except as provided in § 153.7 of this chapter, if a type II hull is required, design calculations must show that a vessel-(1) Longer than 492 feet (150 meters) in length can survive damage at any location; and(2) Except as specified in paragraph (d) of this section, 492 feet (150 meters) or less in length can survive damage at any location.(c) If a Type III hull is required, design calculations must show that a vessel-(1) Except as specified in paragraph (d) of this section, 410 feet (125 meters) in length or longer can survive damage at any location; and(2) Less than 410 feet (125 meters) in length can survive damage at any location except to an aft machinery space.(d) A vessel described in paragraph (b)(2) or (c)(1) of this section need not be designed to survive damage to a main transverse watertight bulkhead bounding an aft machinery space. Except as provided in § 153.7 of this chapter, the machinery space must be calculated as a single floodable compartment.CGD 79-023, 48 FR 51040, Nov. 4, 1983, as amended by CGD 81-101, 52 FR 7799, Mar. 12, 1987