Modification provides an improved entrance door locking mechanism and bayonet release assembly for Model 680FL(P) and a bayonet release assembly for Models 680T, 680V, 680W.
Modification provides an improved cabin door seal assembly that allows a more positive door seal and smoother door operation for Models 680T, 680V, 680W, 681.
Modification approved for ?All-Weather? flight conditions with new visual speed control indicator and ?Tellite? switch installations for Models 500A, 500B, 500U, 560F, 680F, 680FL, 680FL(P), 680F(P), 680T.
Provides night flying safety feature by illuminating wing leading edge. Models 500A, 500B, 500S, 500U, 560F, 680F, 680FL, 680FL(P), 680F(P), 680T, 680V, 680W, and 681.