adhesive layer 58 is then assembled to the lower face 64 centered about the radial location r if u03b4ms is greater than 234 inch pounds but less than or equal to 468 inch pounds two structural film adhesive layers 58 with lengths l s are applied to the spar assembly 36 one structural film adhesive layer 58 at the lower face 64 and one structural film adhesive layer 58 at an upper face 66 finally if u03b4m s is greater than 468 inch pounds but less than or equal to 937 inch pounds two structural film adhesive layers 58 with lengths l s are applied to each of the lower face 64 and the upper face 66 similarly referring to fig7 the leading edge assembly 38 including the leading edge sheath 40 and the plurality of leading edge counterweights 42 is balanced the sheath 40 is loaded onto a sheath balance fixture 68 which is in contact with the plurality of load cells 54 in the embodiment shown the loads cells 54 are secured to the balance table 56 to which the sheath balance fixture 64 is installed further in this embodiment three load cells 54 are utilized but it is to be appreciated that other quantities of load cells 54 may be used to obtain the desired information a moment of the sheath 40 is calculated from readings of load cells 54 a 54 b 54 c in some embodiments the moment is calculated by equation 4 below m sh r 1 u00d7 f a1 r 2 u00d7 f a2 f a3 4 where m sh is the spanwise moment of the sheath 40 next a total moment of the leading edge assembly.