11 Airworthiness Directives: 5 airplane, 3 rotorcraft, 1 propeller, 1 appliance, 1 glider.
AD 77-23-02 · published Dec 7, 1977, effective Dec 7, 1977
BAE Systems (Operations) Limited Airplanes
AD 77-23-04 · published Dec 10, 1977, effective Dec 10, 1977
Dassault Aviation Airplanes
AD 77-23-05 · published Dec 10, 1977, effective Dec 10, 1977
British Aerospace, Aircraft Group Airplanes
AD 77-13-21 · published Dec 12, 1977, effective Dec 16, 1977
Piper Aircraft Inc. Airplanes
AD 77-25-02 · published Dec 12, 1977, effective Dec 12, 1977
Sabreliner Corporation Airplanes
AD 77-25-05 · published Dec 21, 1977, effective Dec 21, 1977
Enstrom Helicopter Corporation, The Helicopters
AD 77-23-08 · published Dec 27, 1977, effective Dec 27, 1977
Schweizer Aircraft Corporation Helicopters
AD 74-15-06 · published Dec 30, 1977, effective Dec 30, 1977
Sikorsky Aircraft Corporation Helicopters
AD 77-12-06 · published Dec 21, 1977, effective Dec 21, 1977
Hartzell Propeller, Inc. Propellers
AD 74-20-10 · published Dec 30, 1977, effective Dec 30, 1977
Leigh Systems Appliances
AD 77-25-04 · published Dec 27, 1977, effective Dec 27, 1977
Alexander Schleicher GmbH & Co. Gliders
