7 Airworthiness Directives: 4 airplane, 3 rotorcraft.
AD 77-18-06 · published Oct 3, 1977, effective Oct 3, 1977
The Boeing Company Airplanes
AD 77-21-03 · published Oct 13, 1977, effective Oct 18, 1977
Piper Aircraft Inc. Airplanes
AD 77-21-06 · published Oct 19, 1977, effective Oct 19, 1977
Lavia Argentina S.A. (Laviasa) Airplanes
AD 77-22-03 · published Oct 28, 1977, effective Oct 28, 1977
Lockheed Martin Corporation Airplanes
AD 76-17-08 · published Oct 4, 1977, effective Oct 4, 1977
Enstrom Helicopter Corporation, The Helicopters
AD 76-17-08 R1 · published Oct 4, 1977, effective Oct 4, 1977
Enstrom Helicopter Corporation, The Helicopters
AD 77-20-02 · published Oct 6, 1977, effective Oct 6, 1977
Enstrom Helicopter Corporation, The Helicopters
