The clutch band of a constant tensioning mooring winch must be set up tight enough to drive the winch drum and should slip only when __________.

In USCG Marine Engineering General Subjects, for engine room systems involving 'The clutch band of a constant tensioning mooring winch must be set up tight enough to drive the winch drum and should slip only when', the standard operating requirement is: 'excessive loads are placed on the winch'.