Modification to add reinforcing straps to the lower spar cap between wing stations 38.00 left and right. Models 500, 500A, 500B, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680FL, 680F(P), 680FL(P), 720, RL26C, RL26D.
Modification increases baggage compartment space to 48 cubic feet / 350 pounds for Models 500A, 500B, 560F, 680E and 680F.
To provide improved visibility for Models 500S, 560E, 560F, 680E, 680F, 680T and 681.
To provide safety feature of prevention of ice formation over fuel tank vents; operates automatically when pitot heat is used. Models 560A, 560E and 680.