May be required to perform such additional duties as structural fire fighting, aircraft fire/crash/rescue duty, security guard, snow removal, munitions loading and handling, heavy equipment operation, maintenance of facilities and equipment, or to serve as a team member on boards to cope with natural disasters or civil emergencies. Work involves the maintenance, troubleshooting, repair, overhaul, and modification of fixed and rotary wing aircraft systems, airframes, components, and assemblies, where the work requires substantive knowledge of the airframe and aircraft mechanical, pneudraulic, and/or electrical systems and their interrelationships.