Inspections consist of pre- and post-flight inspections by the user, periodic/annual inspections by a "properly trained" person, and special inspections by a "technically qualified" person. Users should familiarize themselves with the serviceability and inspection criteria found in this Guide and their respective flight helmets' manual. A "properly trained" person shall have completed hands-on training for periodic/annual inspections under the supervision of a "technically qualified" person. A "technically qualified" person shall have completed hands-on training in the disassembly, inspection, repair, and reassembly of flight helmets. Acceptable training may be received from flight helmet manufacturers, military, or other organizations that regularly inspect and repair flight helmets.