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Service Letter: 2100/2350 Series Bonded Stiffener Corrosion
Serial Letter Number: 212
Applicable Aircraft: Piper PA-12, PA-18, PA-19, American Champion 8GCBC, Aviat Husky A-1, A-1A, A-1B, A-1C-180, A-1C-200, Textron Aviation 170A, 170B, 172 Series, 175 Series, 2100 Floats, 2350 Floats
Applicable Serial Numbers: 21659-21998 and 23097-23180
Revision: A
Release Date: 7/24/2020