1.1.2 Items which
have a limited service life, including rolling element bearings, drive
belts and flexible hoses are to be maintained and replaced at intervals
not exceeding that specified by the Original Equipment Manufacturer’s
recommendations. The service life of such components used in the ACV
main propulsion system(s) is to be specified in the maintenance manual,
which is to be submitted for information.
1.1.3 Where items
of machinery are manufactured at a works that have a quality management
system that has been recognised and accepted by LR as meeting the
requirements of the Quality Assurance Scheme for Machinery, direct
survey of individual items may not be required. See Rules
for Ships, Pt 5, Ch 1, 6 Quality Assurance Scheme for Machinery.
1.1.4 Designs deviating
from the requirements of the Rules for machinery will be subject to
special consideration. It is to be demonstrated that the safety of
the design is at least equivalent to that intended by the Rules. The
submission is to be supported by an engineering and safety justification
covering each deviation from the Rules, see
Ch 4, 1.1 General 1.1.5.
1.1.5 An engineering
and safety justification is to include:
-
A technical argument
to demonstrate how the safety of the systems has been realised
-
A confidence argument
to demonstrate how equivalence with the Rule requirements is to be
satisfied
-
A compliance argument
to demonstrate how the design is going to be validated to prove equivalence
with the Rule requirements.
The engineering and safety justification may include reference
to relevant national or international standards and may require risk
assessment in accordance with IEC/ISO 31010:2010 - Risk management
- Risk assessment techniques.