The invention discloses a fleet and single
airplane combined fatigue
lifetime extension method. The method comprises the steps that testing results and
field data are analyzed by analyzing a known design to determine
lifetime extension critical parts;
damage control standards and repairing measures are formulated according to the
lifetime extension critical parts; an
airplane of which the
life expectancy is reached is selected as a fatigue tester, repairing including the repairing measures of the lifetime extension critical parts is conducted on the fatigue tester, and full-scale
fatigue testing of the repaired fatigue tester is completed to verify the repairing measures and the lifetime extension standards; fatigue and
damage tolerance analysis is conducted on non lifetime extension critical parts to evaluate lifetime extension demands. The method has the advantages that a concept of lifetime extension critical parts is provided, and by aiming at the lifetime extension critical partsand the non lifetime extension critical parts, different measures and demands are adopted, so that lifetime extension is easy to implement; by means of a unified repairing scheme formulated accordingto a fleet and considering damage difference of a single
airplane, single airplane damage dispersion is eliminated or reduced and controlled to greatly reduce time, cost and risks of
fatigue testing.