# AD 83-20-03: Structural Components Replacements - Type: Airworthiness directive - Status: Historical - Products: Piper PA-36-285, PA-36-300 and PA-36-375 - Effective: November 11, 1983 - Superseded by: [AD 2021-11-16](https://openairdocs.org/ad/2021-11-16) - Product type: Aircraft, Small airplane - Amendment: 39-4739 - Registered aircraft: 99 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C16BE2380AE18DAC862569A6005C979F.0001 - DRS record last changed: August 7, 2025 - Page: https://openairdocs.org/ad/83-20-03 ## The airworthiness directive 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. COMPLIANCE: Required as indicated unless already accomplished. To prevent failure of wing structural components because of fatigue damage, accomplish the following: a. Replace 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. Table 1 Compliance Times (Component time-in-service, hours) Airplanes Paragraph of AD Models 2A-36-285 & 300 Type of Replacement a.1)* a.2) a.3) a.4) a.5) a.6) a.7) a.8)* S/Ns 36-7360001 thru 36-7560003 Initial Repetitive 4100 4100 4100 4100 N/A N/A N/A N/A 3100 4100 2000 2000 S/Ns 36-7560004 thru 36-7560055 Initial Repetitive 4100 4100 N/A N/A N/A N/A 4000 4100 4000 4100 2000 2000 S/Ns 36-7560056 thru 36-7660122 Initial Repetitive 4100 4100 N/A N/A 4100 4100 4000 4100 N/A N/A 2000 2000 S/Ns 36-7660123 and up Initial Repetitive 4100 4100 N/A N/A 4100 4100 N/A N/A N/A N/A 2000 2000 Model PA-36-375 S/Ns 36-7802001 and up Initial Repetitive 4100 4100 N/A N/A 4100 4100 N/A N/A N/A N/A 2000 2000 *Compliance with paragraphs a.1) and a.8) is also required whenever applicable bolt is removed. 1) Replace the Wing Attachment Upper Bolts P/N 77245-00 with unused bolts. Replacement is also required whenever bolt is removed. 2) Replace Wing Carry-Through Spar Fittings, P/N 97713-00, -02, or -03, with an unused P/N 97713-03 fitting. 3) Replace Wing Spar Fitting, P/N 97712-00 with an unused P/N 97712-00 fitting. 4) Replace Spar Carry-Through Assembly, P/N 76824-02, if installed with an unused Assembly P/N 76824-02. 5) Replace 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. 6) Replace 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.) 7) Replace 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.) 8) Replace Wing Attachment Lower Bolts P/N 77245-00 with unusedP/N 77245-00 bolts. Replacement is also required whenever bolt is removed. b. Airplanes may be flown in accordance with FAR 21.197 to a location where this AD may be accomplished. c. An 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. This AD supersedes AD 76-25-02, Amendment 39-2786. This amendment becomes effective on November 11, 1983. ## Registered aircraft it may apply to (OpenAirDocs) Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment. - Aircraft: 99 (99 by airframe model, 0 by engine model) - Makers: Piper 99 Models with the most aircraft: - [Piper PA-36-285](https://openairdocs.org/model/piper-pa-36-285): 40 aircraft (airframe model) - [Piper PA-36-300](https://openairdocs.org/model/piper-pa-36-300): 38 aircraft (airframe model) - [Piper PA-36-375](https://openairdocs.org/model/piper-pa-36-375): 21 aircraft (airframe model) All 3 models: https://openairdocs.org/ad/83-20-03/models.md Every aircraft: https://openairdocs.org/ad/83-20-03/aircraft.md ## Related documents - [AD 2021-11-16](https://openairdocs.org/ad/2021-11-16): Wings ยท Piper PA-36-285, PA-36-300 and PA-36-375. Effective Jul 15, 2021. Supersedes this AD Its text cites no advisory circulars or STCs. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.