I claim the ornamental design for an airplane jack adapter, as shown and described.
FIG. 1 of the drawings is a first perspective view showing the front, the top, and a first side of an airplane jack adapter embodying the design of my invention;
FIG. 2 is a second perspective view showing the bottom, the back, and a second side of the airplane jack adapter;
FIG. 3 is an elevation view of the first side of the airplane jack adapter;
FIG. 4 is an elevation view of the front of the airplane jack adapter;
FIG. 5 is a top plan view of the airplane jack adapter;
FIG. 6 is an elevation view of the second side of the airplane jack adapter;
FIG. 7 is an elevation view of the back of the airplane jack adapter; and,
FIG. 8 is a bottom plan view of the airplane jack adapter.
The airplane jack adapter is a device for interfacing an airplane jack to the lower strut fitting of the nose wheel assembly of an aircraft.