When should a plane test be performed on climbers?

The correct choice highlights the importance of consistent safety measures when using climbing equipment like climbers. Conducting a plane test on climbers should be seen as an integral part of routine maintenance and safety checks. This practice is crucial not only when new climbers are received but also regularly after wear and tear, such as when gaffs have been maintained.

By performing a plane test upon receiving climbers, it ensures that the equipment meets the safety specifications right from the start. Regular monthly tests and checks following maintenance provide an additional layer of assurance that climbers remain safe for use over time.

Overall, the rationale behind the correct choice is that the implementation of a plane test after any of these events reinforces the commitment to safety in climbing, which is paramount for preventing accidents and promoting the proper use of equipment in the field. This comprehensive approach ensures that climbers remain in optimal condition throughout their usage lifecycle.