Sidescuttles and windows together with their glasses, deadlightsfootnote and storm coversfootnote, if fitted,
should be of approved design and substantial construction in accordance
with, or equivalent to, recognized national or international standards.
Non-metallic frames should not be acceptable.
Sidescuttles are defined as being round or oval openings
with an area not exceeding 0.16 m2. Round or oval openings
having areas exceeding 0.16 m2 should be treated as windows.
Windows are defined as being rectangular openings generally,
having a radius at each corner relative to the window size in accordance
with recognized national or international standards, and round or
oval openings with an area exceeding 0.16 m2.
Sidescuttles to the following spaces should be fitted with
efficient hinged inside deadlights:
.1 spaces below freeboard deck;
.2 spaces within the first tier of enclosed superstructures;
.3 first tier deckhouses on the freeboard deck
protecting openings leading below or considered buoyant in stability
The deadlights should be capable of being effectively closed
and secured watertight, if fitted below freeboard deck, and weathertight,
if fitted above.
Sidescuttles should not be fitted in such a position that
their sills are below a line drawn parallel to the freeboard deck
at side and having its lowest point 2.5% of the breadth B,
or 500 mm, whichever is the greatest distance, above the summer load
line (or timber summer load line, if assigned).
Sidescuttles should be of the non-opening type in ships
subject to damage stability regulations, if calculations indicate
that they would become immersed by any intermediate stage of flooding
or the final equilibrium waterplane in any required damage case.
Windows should not be fitted below the freeboard deck, in
the first tier end bulkheads or sides of enclosed superstructures
and in first tier deckhouses considered buoyant in the stability calculations
or protecting openings leading below.
Sidescuttles and windows at the side shell in the second
tier, protecting direct access below or considered buoyant in the
stability calculations, should be provided with efficient hinged inside
deadlights capable of being effectively closed and secured weathertight.
Sidescuttles and windows set inboard from the side shell
in the second tier, protecting direct access below to spaces listed
in paragraph 3.4 above, should be provided with either efficient hinged
inside deadlights or, where they are accessible, permanently attached
external storm covers of approved design and of substantial construction
and capable of being effectively closed and secured weathertight.
Cabin bulkheads and doors in the second tier separating
sidescuttles and windows from a direct access leading below may be
accepted in place of deadlights or storm covers fitted to the sidescuttles
Deckhouses situated on a raised quarter-deck or on the deck
of a superstructure of less than standard height may be regarded as
being in the second tier as far as the provision of deadlights is
concerned, provided the height of the raised quarter-deck or superstructure
is equal to, or greater than, the standard quarter-deck height.
Fixed or opening skylights should have glass thickness appropriate
to their size and position as required for sidescuttles and windows.
Skylights glasses in any position should be protected from mechanical
damage and, where fitted in position 1 or 2, should be provided with
robust deadlights or storm covers permanently attached.