(3) Enclosed superstructures complying with Regulation 3(10)(b) of
the 1966 Load Line Convention may be taken into account.
(4) The second tier of similarly enclosed superstructures may also be
taken into account.
(5) Deckhouses on the freeboard deck may be taken into account,
provided that they comply with the conditions for enclosed
superstructures laid down in Regulation 3(10)(b) of the 1966 Load Line
Convention.
(6) Where deckhouses comply with the above conditions, except that no
additional exit is provided to a deck above, such deckhouses should not
be taken into account; however, any deck openings such deckhouses shall
be considered as closed even where no means of closure are provided.
(7) Deckhouses, the doors of which do not comply with the
requirements of Regulation 12 of the 1966 Load Line Convention should
not be taken into account; however, any deck openings inside the
deckhouses are regarded as closed where their means of closure comply
with the requirements of Regulations 15,17 or 18 of the 1966 Load Line
Convention.
(8) Deckhouses on decks above the freeboard deck should not be taken
into account, but openings within them may be regarded as closed.
(9) Superstructures and deckhouses not regarded as enclosed can,
however, be taken into account in stability calculations up to the angle
at which their openings are flooded. (At this angle, the statical
stability curve should show one or more steps, and in subsequent
computations the flooded space should be considered non-existent.)
(10) In cases where the ship would sink due to flooding through any
openings, the stability curve should be cut short at the corresponding
angle of flooding and the ship should be considered to have entirely
lost her stability.
(11) Small openings such as those for passing wires or chains, tackle
and anchors, and also holes of scuppers, discharge and sanitary pipes
should not be considered as open if they submerge at an angle of
inclination more than 30° or less, these openings should be assumed
open if the Administration considers this to be a source of significant
flooding.
(12) Trunks may be taken into account. Hatchways may also be taken
into account having regard to the effectiveness of their closures.