4 Airworthiness Directives: 2 airplane, 1 rotorcraft, 1 propeller.
AD 60-20-03 · published 1960
Lockheed Martin Corporation Airplanes
AD 60-20-01 · published Sep 28, 1960, effective Oct 28, 1960
Twin Commander Aircraft LLC Airplanes
AD 60-19-01 · published 1960
Sikorsky Aircraft Corporation Helicopters
AD 60-20-02 · published 1960
Hamilton Standard Division Propellers
