These match the airframe or engine model. Whether each one applies, and whether it's been complied with, depends on serial numbers, equipment and logbook entries. Applicability must be confirmed by a mechanic against the aircraft's records.
Aviat Aircraft, Inc. Models S-1S, S-1T, S-2, S-2A, S-2S, and S-2B Airplanes
Nov 20, 1998
Airframe (S-2A)Certain serial numbers: S-2B 5000–5336. Only with: Equipped with aft lower fuselage wing attach fittings P/N 76090, 2-2107-1, or 1-210-102 not modified on both wings per Aviat SB No. 25 (any revision).
Aviat Aircraft, Inc. Models S-1S, S-1T, S-2, S-2A, S-2S, and S-2B Airplanes (Formerly…
Oct 3, 1997
Airframe (S-2A)Certain serial numbers: S-2B 5000–5348. Only with: Equipped with aft lower fuselage wing attach fittings P/N 76090, 2-2107-1, or 1-210-102 on both wings not modified per Aviat SB No. 25.