7 Airworthiness Directives: 4 airplane, 1 rotorcraft, 2 appliance.
AD 56-19-01 · published 1956
de Havilland Aircraft Co., Ltd., The Airplanes
AD 56-20-04 · published 1956
Kelowna Flightcraft R & D Ltd. Airplanes
AD 56-20-06 · published 1956
Curtiss-Wright/Marquette, Inc., Hamilton Standard Appliances