Brief Description: Riveted AST assembly, match drilled hinges.
Riveted top flange of four HS-1222 AST Ribs to AST Skin (HS-1221), both left and right. Flush riveted HS-1220 AST Control Horns to inboard HS-1222 Ribs. Riveted top part of HS-1221 Spars to AST Skins. Trimmed AN257-P3X6 (MS 20257-3) Piano Hinge. Match drilled the 2 halves, sanded and deburred holes and edges.
