TM 10-1670-287-23&P  0050 00  0050 00-11  SECTION A-A  SECTION A-A SECTION B-B SECTION B-B  ½-IN. ½-IN. ½-IN.  ½-IN. ½-IN. ½-IN. 1-IN. 1-IN. ¾-IN. $^{1}$/$_{16}$-IN. $^{1}$/$_{16}$-IN. $^{1}$/$_{16}$-IN.  ¾-IN.  INSIDE VIEW  INSIDE VIEW  C. OUTSIDE VIEW  C. TRIANGULAR PATCH AT FRONT  LEADING EDGE OF RIBS.  D. OUTSIDE VIEW  D. FOUR-SIDED PATCH AT  FORWARD LEADING EDGE OF  RIBS.