HomeAD libraryBy monthApril 1953ADs published in April 19536 Airworthiness Directives: 3 airplane, 1 rotorcraft, 2 engine.March 1953May 1953AirplaneAD 53-08-01 · published 1953Sierra Hotel Aero, Inc. AirplanesSierra Hotel Aero, Inc. AirplanesAD 53-08-02 · published 1953The Boeing Company AirplanesThe Boeing Company AirplanesAD 53-09-02 · published 1953Viking Air Limited AirplanesViking Air Limited AirplanesRotorcraftAD 53-09-03 · published 1953Hiller Aviation HelicoptersHiller Aviation HelicoptersEngineAD 53-09-01 · published 1953Pratt & Whitney Division EnginesPratt & Whitney Division EnginesAD 53-09-04 · published 1953Continental EnginesContinental Engines
