2.2.1 The craft should have a designed reserve
of buoyancy when floating in seawater of not less than 100 per cent
at the maximum operational weight. The Administration may require
a larger reserve of buoyancy to permit the craft to operate in any
of its intended modes. The reserve of buoyancy should be calculated
by including only those compartments which are:
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(a) watertight;
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(b) considered by the Administration to have scantlings
and arrangements adequate to maintain their watertight integrity;
and
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(c) situated below a datum, which may be a watertight
deck or equivalent structure watertight longitudinally and transversely
and from at least part of which the passengers could be disembarked
in an emergency.
2.2.2
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(a) Means should be provided for checking the
watertight integrity of buoyancy compartments. The inspection procedures
adopted and the frequency at which they are carried out should be
to the satisfaction of the Administration.
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(b) Where entry of water into structures above
the datum as defined in 2.2.1 (c) would significantly influence the
stability and buoyancy of the craft, such structures should be of
adequate strength to maintain the weathertight integrity or be provided
with adequate drainage arrangements. A combination of both measures
may be adopted to the satisfaction of the Administration. The means
of closing of all openings in such structures should be such as to
maintain the weathertight integrity.