| 2002-23-13 | Pratt & Whitney Canada PT6A Series Turboprop Engines | Dec 31, 2002 | Engine (PT6A-60A)Only with: Engines with turbine exhaust ducts P/N 3012290, 3031988, 3032117, 3035784, 3035786, 3105890-01, 3112167-01, or 3111780-01 installed. |
| 2000-14-51 | Air Tractor, Inc. Models AT-501, AT-502, and AT-502A Airplanes | Aug 4, 2000 | Airframe (AT-502)Certain serial numbers: AT-501 501-002–501-0060; AT-502 502-003–502-0061. Only with: AT-501 only if converted to turboprop power; AT-502 excludes those upgraded to 8,000-pound gross weight configuration via Snow Engineering Co. Service Letter #80J; AT-502A all serial numbers. |
| 98-25-01 | Air Tractor, Inc. AT-300, AT-400, and AT-500 Series Airplanes | Jan 19, 1999 | Airframe (AT-502)Certain serial numbers: AT-300, AT-301, AT-302, AT-400, AT-400A, AT-401, AT-401A, AT-401B, AT-402, AT-402A, AT-402B 300-0001–401B-1063; AT-501, AT-502, AT-502A, AT-502B, AT-503A 502-0001–502B-0500. Only with: Airplanes that do not have P/N 70975-1 flap actuator overtravel stop installed per Snow Engineering Co. Service Letter #165, dated May 15, 1998. |
| 96-24-08 | Air Tractor, Inc. Models AT-250, AT- 300, AT-301, AT-302, AT-400, AT-400A, AT-401… | Dec 23, 1996 | Airframe (AT-502)Certain serial numbers: AT-250 250-0491; AT-300 300-0001–300-0708; AT-301 301-0001–301-0708; AT-302 302-0001–302-0708; AT-400 400-0001–400-0708; AT-400A 400A-0001–400A-0708; …. Only with: Equipped with a Gerdes P/N A-850-5 or Cleveland P/N 60-9 parking brake valve. |