An OSHA-Compliant Training Class Online for Articulated Boom Trucks (Knuckle Boom Cranes, Drywall Cranes). I-CAB Recognized. This course satisfies OSHA's requirements for the classroom portion of operator safety training. Quiz questions along the way prepare you for the final written exam. Upon completion, gain access to and print off your test, certificate, and a checklist which can be used by your employer to administer the required practical observation.