We perform hundreds of equipment inspections per year ranging from digger derricks, knuckle trucks, drywall delivery booms, mobile cranes, overhead and tower cranes.  We also do repairs and preventative maintenance and we are never asked from a client if we are qualified.  Qualification is a term used by the crane industry and regulators as a person who has extensive knowledge, training and experience.  Certification on the other hand is someone who has passed an exam whether its written or practical or a combination of both.  A certified inspector does not make them qualified to inspect equipment.  As the owner of a crane you should ask from your inspector to substantiate their experience by means of references and some sort of resume.  People who have an extensive mechanical background make some of the best equipment auditors.  The following pictures show violations of ASME B30.5, OSHA 1926.1400 and manufactures requirements.

Inadequate Ply Rating For Pick, Carry & Stability on Rubber
Rope Damage caused by back-lashing creating high / low spots in the rope as the load transfers to these spots the rope crushes
Sheave damage – Rope jumped sheave causing damage to the outside of flange (not seen in this picture) Additional damage to bearing
Wire clip attached to the live side of the rope, inadequate tail length, no rope seizing, wrong termination technique
Jib strike damage
Pins and crush tags missing on all 4 outriggers
No crush tag on rear rotating superstructure