Before revision: Widespread fatigue caused the in-flight failure of the fuselage on Aloha Airlines Flight 243 Widespread fatigue damage (WFD) in a structure is characterised by the simultaneous presence of fatigue cracks at multiple points that are of sufficient size and density such that the structure will no longer meet its damage tolerance requirement and could fail.
After revision: Widespread fatigue caused the in-flight failure of the fuselage on Aloha Airlines Flight 243 Widespread fatigue damage (WFD) in a structure is characterised by the simultaneous presence of fatigue cracks at multiple points that are of sufficient size and density that while individually they may be acceptable, link-up of the cracks could suddenly occur and the structure could fail.