Each incident in which -
(a) the fracture or failure of any part of machinery resulted in a falling or flying object;
(b) machinery ran out of control as a result of the failure of a control or safety equipment and could have caused an injury to a person who had been conveyed on or in such machinery or had been in the vicinity thereof; or
(c) the fracture or failure of any part of machinery in which gas is under pressure resulted in the sudden release of such gas, shall be reported forthwith to an inspector by the employer or user of machinery concerned.