The E-701-L/R elevator skins and E-720 (A-L) elevator skin stiffeners are provided with pre-punched holes. The various E-720 stiffeners are snipped from the pre-punched lengths of aluminum angle. The double notch in the edge denotes the overall length of the stiffener. Use aviation snips to cut from center to center of the guide holes (See E-720 Trim Detail, DWG 5).
Trim the flange of the stiffener (surface perpendicular to the skin) to fit inside the tapered elevator. Single notches on the edge of the stiffener note the beginning points of these trim cuts. Trim the stiffeners and clean up the edges with a file and the Scotchbrite wheel (See E-720 Trim Detail, DWG 5).
Make stiffeners E-720J, E-720K and E-720L from the existing E-720D, E-720E and E-720F (See E-720 Trim Detail and Note 1, DWG 5). Set aside stiffeners for use in the left elevator assembly.
