Special Features:

Post 4, socket crystal 1, switch section 2; two no. 4/0.112/in.-40 screws 5/16 in. Lg spaced 1-1/2 in. C to c; radio set, radio, exc. Navigation and home types nonairborne

Properties:

Two or more different types of items having a common mounting or mounted on each other which together form a portion of a selector control but which in itself is not a complete functioning item and cannot be assigned a more definite item name.