def absolute_lateral_stability(F_y, F_z, F_R, mu, W_sub, gamma_SC
    ) ->'abs_lat_stab_uty':
    """Absolute lateral stability unity check. 
    Reference:
    DNVGL-RP-F109 (2017-05) 
        sec:3.6.1, eq:3.38, page:31 
    """
    abs_lat_stab_uty = gamma_SC * (F_y + mu * F_z) / (mu * W_sub + F_R)
    return abs_lat_stab_uty
