Fail safe

From International Dictionary of Marine Aids to Navigation
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In a remotely or automatically controlled system, that characteristic which, if any component or subsystem fails, ensures that the system will continue to provide the required service but without the remote or automatic control.

Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM