5.2.1 Essential systems identified to be fully
redundant for all fire and flooding casualty cases not exceeding the
threshold (e.g., when runs of cables, pipes and equipment are duplicated
and adequately separated), need not be further analysed as described
in section 6.
5.2.2 For the arrangement of equipment, components
or connections reference may be made to relevant interpretations contained
in paragraph 2 of appendix 1 to these Interim Explanatory Notes. Where
other solutions are adopted, equipment, components or connections
should be further analysed as described in section 6.
5.2.3 Manual action by the crew, to provide ship
systems' capabilities, may also be possible but should be assessed
in detail taking into account that:
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.1 manual action should only be acceptable by
the Administration in connection with an agreed defined number of
fire and flooding casualties and should be clearly described in the
documentation that should be prepared as per section 7;
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.2 compliance with the return to port criteria
should be based on the assumption that any manual action that may
be required for the ship to return to port, or for any essential system
to remain operational, following a casualty:
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.1 is pre-planned, pre-set and instructions as
well as necessary materials are available on board;
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.2 is performed on systems designed to ensure
that the required manual action can be completed within one hour from
the time the action started; and
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.3 emergency lighting and a means of communication
is demonstrated available in the area where manual actions are to
be taken; and
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.3 in general, feasibility of manual actions should
be demonstrated by tests or drills, as applicable.
5.2.4 Performance requirements applicable to any
essential system may be analysed and documented separately; however,
any relevant information should be included in the overall assessment
of essential systems' report.