Appendix 9
APPENDIX 9. LIST OF SIGNIFICANT ALTERATIONS THAT MAY
ADVERSELY AFFECT FATIGUE CRITICAL STRUCTURE
1. Passenger-to-freighter conversions (including addition of main deck cargo doors).
2. Gross weight increases (increased operating weights, increased zero fuel weights, increased landing weights, and increased maximum takeoff weights).
3. Installation of fuselage cutouts (passenger entry doors, emergency exit doors or crew escape hatches, fuselage access doors, and cabin window relocations).
4. Complete re-engine or pylon alterations.
5. Engine hush-kits.
6. Wing alterations such as installing winglets or changes in flight control settings (flap droop), and alteration of wing trailing edge structure.
7. Modified skin splices.
8. Antenna Installations.
9. Any alteration that affects several stringer or frame bays.
10. An alteration that covers structure requiring periodic inspection by the operator’s maintenance program.
11. An alteration that results in operational mission change that significantly changes the manufacturer’s load or stress spectrum (e.g., passenger-to-freighter conversion). Examples of this type of alteration may be an alteration that adds new structural splices, or increases the operational loads causing existing structure to become fatigue critical.
12. An alteration that changes areas of the fuselage which prevents external visual inspections (for example, the installation of a large external fuselage doubler that results in hiding details beneath it).
13. In general, attachment of interior monuments to fatigue critical structure. Interior monuments include large items of mass such as galleys, closets, and lavatories.
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