For the purpose of § 172.170 -
(a) Design calculations must include both side and bottom damage, applied separately; and
(b) Damage must consist of the penetrations having the dimensions given in Table 172.180 except that, if the most disabling penetrations would be less than the penetrations given in Table 172.180, the smaller penetration must be assumed.
Table 172.180 - Extent of Damage
| Collision Penetration | |
| Longitudinal extent | 0.495L 2⁄3 or 47.6 feet ((1⁄3)L 2⁄3 or 14.5m) whichever is shorter. |
| Transverse extent1 | B/5 or 37.74 feet (11.5m)2 whichever is shorter. |
| Vertical extent | From the baseline upward without limit. |
| Grounding Penetration at the Forward End But Excluding Any Damage Aft of a Point 0.3L Aft of the Forward Perpendicular | |
| Longitudinal extent | 0.495L 2⁄3 or 47.6 feet ((1⁄3)L 2⁄3 or 14.5m) whichever is shorter. |
| Transverse extent | B/6 or 32.81 feet (10m) whichever is shorter. |
| Vertical extent from the molded line of the shell at the centerline | B/15 or 6.6 feet (2m) whichever is shorter. |
| Grounding Penetration At Any Other Longitudinal Position | |
| Longitudinal extent | L/10 or 16.41 feet (5m) whichever is shorter. |
| Transverse extent | B/6 or 16.41 feet (5m) whichever is shorter. |
| Vertical extent from the molded line of the shell at the centerline | B/15 or 6.6 feet (2m) whichever is shorter. |