Appendix
4 – Examples of changes that may require full-scale fatigue testing
ED Decision 2017/015/R
The following are examples of types of modifications that may require full-scale fatigue testing:
(1) passenger-to-freighter conversions (including addition of cargo doors);
(2) gross weight increases (e.g. increased operating weights, increased zero-fuel weights, increased landing weights, and increased maximum take-off weights);
(3) installation of fuselage cut-outs (e.g. passenger entry doors, emergency exit doors or crew escape hatches, fuselage access doors, and cabin window relocations);
(4) complete re-engine or pylon change;
(5) engine hush kits;
(6) wing modifications (e.g. installation of winglets, changes in flight-control settings such as flap droop, and change of wing trailing-edge structure);
(7) modified or replaced skin splice;
(8) any modification that affects three or more stiffening members (e.g. wing stringers and fuselage frames);
(9) a modification that results in operational-mission change, which significantly changes the original equipment manufacturer’s load/stress spectrum (e.g. extending the flight duration from 2 hours to 10 hours); and
(10) a modification that changes areas of the fuselage from being externally inspectable using visual means to being non-inspectable (e.g. installation of a large, external fuselage doubler that results in hiding details beneath it).
[Amdt 25/19]
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