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Title 14: Aeronautics and Space
CHAPTER I: FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION
SUBCHAPTER C: AIRCRAFT
PART 23: AIRWORTHINESS STANDARDS: NORMAL, UTILITY, ACROBATIC, AND COMMUTER CATEGORY AIRPLANES
Subpart D: Design and Construction
23.609 - Protection of structure.
Each part of the structure must?
(a) Be suitably protected against deterioration or loss of strength in service due to any cause, including?
(1) Weathering;
(2) Corrosion; and
(3) Abrasion; and
(b) Have adequate provisions for ventilation and drainage.
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