4 Airworthiness Directives: 3 airplane, 1 appliance.
AD 52-12-02 · published 1952
Airlift International, Inc., Curtiss-Wright Corporation, Flying Tiger Line, Inc., L. B. Smith Aircraft Corporation, Skyways International Trading and Transport Co., Tempo Design Corporation Airplanes
AD 52-12-03 · published 1952
Lockheed Aircraft Corporation Airplanes
AD 52-13-02 · published 1952
Lockheed Aircraft Corporation Airplanes