8 Airworthiness Directives: 4 airplane, 4 rotorcraft.
AD 56-15-04 · published 1956
de Havilland Aircraft Co., Ltd., The Airplanes
AD 56-16-02 · published 1956
Lockheed Aircraft Corporation Airplanes
AD 56-16-04 · published 1956
Swift Museum Foundation, Inc. Airplanes
AD 56-16-03 · published 1956
Orlando Helicopter Airways, Inc., Sikorsky Aircraft Corporation Helicopters