The electrical system should be designed and installed to
the requirements of the Administration so that:
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(a) the probability of the craft being hazarded
by failure of a service is extremely remote footnote,
taking into account:
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(i) operation without fault;
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(ii) the occurrence of single failure; and
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(iii) the occurrence of conditions which could
be imposed on it as a result of a single failure in another system
in the craft;
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(b) the safety of occupants (e.g. from electric
shock) and of the craft (e.g. from fire) is assured.