AD FAA-2006-24281

This final rule amends FAA regulations pertaining to certification and operation of transport category airplanes to prevent widespread fatigue damage in those airplanes. For certain existing airplanes, the rule requires design approval holders to evaluate their airplanes to establish a limit of validity of the engineering data that supports the structural maintenance program (LOV). For future airplanes, the rule requires all applicants for type certificates, after the affective date of the rule, to establish an LOV. Design approval holders and applicants must demonstrate that the airplane will be free from widespread fatigue damage up to the LOV. The rule requires that operators of any affected airplane incorporate the LOV into the maintenance program for that airplane. Operators may not fly an airplane beyond its LOV unless an extended LOV is approved.