4.14.1 Jacking mechanisms should be:
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.1 arranged so that a single failure of any component
does not cause an uncontrolled descent of the unit;
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.2 designed and constructed for the maximum lowering
and lifting loads of the unit as specified in the unit’s operation
manual in accordance with paragraph 14.1.2.8;
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.3 able to withstand the forces imposed on the
unit from the maximum environmental criteria for the unit; and
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.4 constructed such that the elevation of the
leg relative to the unit can be safely maintained in case of loss
of power (e.g., electric, hydraulic, or pneumatic power).