AD 2002-11-05: Air Tractor, Inc. Models AT-400, AT-401, AT-401B, AT-402, AT-402A, AT-402B, AT-501…

This AD applies to certain Models AT-400, AT-401, AT-401B, AT-402, AT-402A, AT-402B, AT-501, AT-802, and AT-802A airplanes. Use paragraph (a)(1) of this AD for affected airplanes that do not incorporate and never have incorporated winglets. Use paragraph (a)(3) of this AD for certain Models AT-401, AT-401B, AT-402, AT-402A, AT-402B, and AT-501 airplanes that incorporate or have incorporated Marburger Enterprises, Inc. winglets. (1) The following presents airplanes (certificated in any category) that are affected by this AD, along with the new safe life (presented in hours time-in-service (TIS)) of the wing lower spar cap for all affected airplane models and serial numbers: Model Serial numbers Safe life AT-400 all serial numbers 13,300 hours TIS. beginning with 0416. AT-401 0662 through 0951 10,757 hours TIS. AT-401B 0952 through 1014 and 6,948 hours TIS. 1016 though 1020. AT-401B 1015 and 1021 through 7,777 hours TIS. 1124. AT-402 0694 through 0951 7,440 hours TIS. AT-402A 0738 through 0951 7,440 hours TIS. AT-402A 0952 through 1020 4,589 hours TIS. AT-402A 1021 through 1124 5,268 hours TIS. AT-402B 0966 through 1020 4,589 hours TIS. AT-402B 1021 through 1124 5,268 hours TIS.…