16 Airworthiness Directives: 13 airplane, 3 rotorcraft.
AD 91-20-07 · published Oct 7, 1991, effective Oct 7, 1991
Airbus Industrie, Airbus Airplanes
AD 91-18-16 · published Oct 8, 1991, effective Oct 8, 1991
Fokker Services Airplanes
AD 91-19-06 · published Oct 10, 1991, effective Oct 10, 1991
Piaggio Aero Industries S.p.A. Airplanes
AD 91-18-20 · published Oct 15, 1991, effective Oct 15, 1991
Viking Air Limited Airplanes
AD 91-18-21 · published Oct 15, 1991, effective Oct 15, 1991
Viking Air Limited Airplanes
AD 91-18-13 · published Oct 16, 1991, effective Oct 16, 1991
Short Brothers PLC Airplanes
AD 91-18-19 · published Oct 21, 1991, effective Oct 21, 1991
Hawker Beechcraft Corporation Airplanes
AD 91-21-02 · published Oct 23, 1991, effective Oct 23, 1991
The Boeing Company Airplanes
AD 91-21-05 · published Oct 23, 1991, effective Oct 23, 1991
McDonnell Douglas Corporation Airplanes
AD 91-21-09 · published Oct 28, 1991, effective Nov 29, 1991
Piper Aircraft Inc. Airplanes
AD 91-21-11 · published Oct 30, 1991, effective Oct 30, 1991
McDonnell Douglas Corporation Airplanes
AD 91-20-08 · published Oct 31, 1991, effective Oct 31, 1991
Textron Aviation Inc. Airplanes
AD 89-20-13 · published Oct 15, 1991, effective Oct 15, 1991
Bell Helicopter Textron Canada Limited Helicopters
AD 90-13-01 R1 · published Oct 17, 1991, effective Oct 17, 1991
Bell Helicopter Textron Canada Limited Helicopters
AD 90-03-10 · published Oct 18, 1991, effective Oct 18, 1991
Arrow Falcon Exporters, Inc., AST, Inc, Bell Helicopter Textron, Inc., California Department of Forestry, Global Helicopter Technology, Inc., Hagglund Helicopters, LLC, International Helicopters, Inc., Northwest Rotorcraft, LLC, Overseas Aircraft Support Inc, Richards Heavylift Helo, Inc., Rotorcraft Development Corporation, San Joaquin Helicopters, Smith Helicopters, Sou
