Aircraft instrument, electrical and avionics mechanics, technicians and inspectors install, adjust, repair and overhaul aircraft instrument, electrical or avionics systems on aircraft. This unit group also includes avionics inspectors who inspect instrument, electrical and avionics systems following assembly, modification, repair or overhaul. They are employed by aircraft manufacturing, maintenance, repair and overhaul establishments and by airlines and other aircraft operators. Apprentices are also included in this unit group.