Appendix 4 - Examples of changes that may require full-scale fatigue testing

• ED Decision 2017/015/R found in: CS-25 Amdt 27 - Large Aeroplanes (Jan 2023)

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]