Crane Alteration Request Summary

This is a Navy Crane Alteration Request (CAR) form N3258A-19-008 for the replacement of electric wire rope hoists and hoist/trolley units on a standing crane. The document supersedes Standing CAR Number N3258A-07-005 and was approved by the Navy Crane Center on 8/6/2019. The alteration applies to standing cranes with rated capacities of 20,000 lbs or greater used in ordnance handling, molten metal applications, Special Purpose Service (SPS) designations, and hazardous area applications, though it excludes microprocessor-controlled hoists and those with rotation-resistant wire rope.

The CAR establishes comprehensive technical and performance requirements for replacement hoists and hoist/trolley units, including compliance with ASME, NFPA, and other referenced standards. Key requirements encompass electrical safety specifications, mechanical load brake systems with specific design criteria, trolley compatibility, wire rope selection and handling, control systems with dual upper limit switches, overload protection mechanisms, and various hardware specifications for hooks, sheaves, and fasteners. For radio-controlled hoists, additional attributes include digitally pulse-encoded transmitter signals, continuous status signal monitoring, and eight-hour battery endurance. The CAR also includes recommendations for keyed-bypass switches for primary and secondary limit switch testing, gearedLimit switch activation, and optional enhancements for trolley drive systems. Activities proposing replacement hoists must reference this Standing CAR and provide documentation demonstrating compliance; if all requirements cannot be met, a separate CAR seeking Navy Crane Center approval is required.