Carry Deck Cranes anti-two-blocking test

Here is a brief video of the safety anti-two-blocking switches that prevent the wire rope from being wound in or tensed as the mast is extended outward and the load hook bottoms out. All crane operators, must perform this test everyday and mostly prior to each use of any crane. Pre-operational inspections are mandatory and a very good preventive measure to catch any discrepancies early prior to use. No, I am not a certified crane operator, I do maintain, service and repair cranes and other Ground Support Equipment machines for the Aviation Industry at an Aircraft Repair MRO. Thanks for watching. Get your certificación before you attempt to operate and use a crane, OSHA requires it.