Section R. 408.11931 - Operating practices; generalRule 1931.
(1) An operator shall respond to signals only from the designated signalman using appropriate signals, except where voice communications equipment is used (See figure 1). An operator shall obey a stop signal from anyone.(2) A crane shall be equipped with an audible signaling device which shall be actuated before traveling and intermittently during travel when approaching an employee. When moving a crane, the following signals shall be used: (a) Stop, 1 audible signal.(b) Go ahead, 2 audible signals.(c) Back up, 3 audible signals.(3) An operator is responsible for those operations under his control. Whenever there is doubt as to safety, he shall stop operations until safety is assured.(4) An operator shall not close a switch or start an engine if there is a warning sign or tag on the starting controls until the sign or tag has been removed by the employee placing it or removed by an authorized employee after making sure the hazard is removed. Before closing a switch or starting an engine, an operator shall see that all controls are in the off position and all employees are in the clear.(5) If power fails during operation, the operator shall:(a) Set all brakes and locking devices.(b) Move all clutches and other power controls to the off or neutral position, unless such action would create an unsafe condition.(c) If practicable, land any suspended load under brake control.Mich. Admin. Code R. 408.11931