10 Airworthiness Directives: 7 airplane, 2 rotorcraft, 1 appliance.
AD 58-01-01 · published 1958
Twin Commander Aircraft LLC Airplanes
AD 58-01-03 · published 1958
Kelowna Flightcraft R & D Ltd. Airplanes
AD 58-01-05 · published 1958
Lockheed Aircraft Corporation Airplanes