83-20-03 PIPER: Amendment 39-4739. Applies to Models PA-36-285, PA-36-300 and PA-36-375 (all serial numbers) airplanes certificated in any category. \n\n\tCOMPLIANCE: Required as indicated unless already accomplished. \n\n\tTo prevent failure of wing structural components because of fatigue damage, accomplish the following: \n\n\ta.\tReplace the structural components specified below at the time-in-service set forth in Table I. If, on the effective date of this AD, the component has accumulated or will accumulate within an additional 100 hours time-in-service, the number of hours time-in-service at which replacement is required, accomplish the replacement within the next 100 hours time-in- service after the effective date of this AD. \n\n\t\t\t\t\t\tTable 1 \n\n\n\n\n\n\n\n\nCompliance Times \n(Component time-in-service, hours)\nAirplanes\n\n\n\n\n\n\nParagraph of AD \nModels 2A-36-285 & 300 \nType of Replacement\na.1)* a.2) a.3)\na.4) \na.5) \na.6)\n a.7) \na.8)*\nS/Ns 36-7360001 thru 36-7560003\nInitial\nRepetitive\n4100\n4100\n4100\n4100\nN/A \nN/A\nN/A \nN/A \n3100\n4100\n2000\n2000\nS/Ns 36-7560004 thru 36-7560055\nInitial\nRepetitive\n4100\n4100\nN/A\nN/A\nN/A\nN/A\n4000\n4100\n4000\n4100\n2000\n2000\nS/Ns 36-7560056 thru 36-7660122\nInitial\nRepetitive\n4100\n4100\nN/A\nN/A\n4100\n4100\n4000\n4100\nN/A\nN/A\n2000\n2000\nS/Ns 36-7660123 and up\nInitial \nRepetitive\n4100\n4100\nN/A\nN/A\n4100\n4100\nN/A\nN/A\nN/A\nN/A\n2000\n2000\nModel PA-36-375 \n\n\n\n\n\n\n\nS/Ns 36-7802001 and up\nInitial \nRepetitive\n4100\n4100\nN/A\nN/A\n4100\n4100\nN/A\nN/A\nN/A\nN/A\n2000\n2000\n\n*Compliance with paragraphs a.1) and a.8) is also required whenever applicable bolt is removed.\n\n\t\t1)\tReplace the Wing Attachment Upper Bolts P/N 77245-00 with unused bolts. Replacement is also required whenever bolt is removed. \n\n\t\t2)\tReplace Wing Carry-Through Spar Fittings, P/N 97713-00, -02, or -03, with an unused P/N 97713-03 fitting. \n\n\t\t3)\tReplace Wing Spar Fitting, P/N 97712-00 with an unused P/N 97712-00 fitting. \n\n\t\t4)\tReplace Spar Carry-Through Assembly, P/N 76824-02, if installed with an unused Assembly P/N 76824-02. \n\n\t\t5)\tReplace Spar Assembly P/N 97701-00 and -01, Revision P, or later revision with Piper Spar Cap Replacement Kits Number 764393, Left Spar Assembly, and 764394, Right Spar Assembly. \n\n\t\t6)\tReplace Spar Carry-Through Assembly, P/N 76767-00 or P/N 76824-02 with an unused P/N 76824-02 assembly. (The repetitive replacement time-in-service is applicable to P/N 76824-02 assemblies now installed.) \n\n\t\t7)\tReplace Spar Assemblies P/N 97701-00 and P/N 97701-01, Revision N or earlier, and P/N 764393 and P/N 764394 Right Spar Cap Replacement Kits with an unused Spar Cap Replacement Kit P/N 764393, Left Spar Assembly, and P/N 764394 Right Spar Assembly. (The repetitive replacements time-in-service is applicable to P/N 764393 or P/N 764394, Spar Cap Replacement now installed.) \n\n\t\t8)\tReplace Wing Attachment Lower Bolts P/N 77245-00 with unusedP/N 77245-00 bolts. Replacement is also required whenever bolt is removed. \n\n\tb.\tAirplanes may be flown in accordance with FAR 21.197 to a location where this AD may be accomplished. \n\n\tc.\tAn equivalent method of compliance with this AD may be used if it is approved by the Manager, New York Aircraft Certification Office, 181 South Franklin Avenue, Room 202, Valley Stream, New York 11581; telephone (516) 791-6680. \n\n\tThis AD supersedes AD 76-25-02, Amendment 39-2786. \n\n\tThis amendment becomes effective on November 11, 1983.