{"id":"F2006B06246","name":"AD/PITTS S-2/17 Amdt 2 - Rear Lower Fuselage Wing Fittings","slug":"ad-pitts-s-2-17-amdt-2-rear-lower-fuselage-wing-fittings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47211,"registerId":"commonwealth-F2006B06246-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PITTS S-2/17 Amdt 2 - Rear Lower Fuselage Wing Fittings","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nPitts S-1 and S-2 Series Aeroplanes\n\nAD/PITTS S-2/17\n\nAmdt 2\n\n  \nRear Lower Fuselage Wing Fittings 2/99\n\nApplicability: All models, except model S-2B serial number 5337 and on.\n\nRequirement: Action in accordance with the ACCOMPLISHMENT INSTRUCTIONS section of Aviat Aircraft Service Bulletin No.25 dated April 3 1996, initial issue or as revised 12 November 1996 or 11 November 1997.\n\nNote: FAA AD 96-12-03 R2 refers.\n\nCompliance: Unless already accomplished, inspect within 50 hours time in service after 6 November 1997. Re-inspect at intervals not exceeding 50 hours time in service until modified in accordance with the repair scheme at paragraph 6.C. of the requirement document.\n\nThis Amendment becomes effective on 25 February 1999.\n\nBackground: Cracking of the rear lower fuselage fittings has been discovered in models S-2. The same fitting is also used in Models S-1. A cracked fitting may cause an in flight wing separation.\n\nAmendment 1 excluded certain model S-2B aircraft, which have an improved rear lower fuselage wing fitting incorporated during manufacture, and updated the referenced requirement document and FAA airworthiness directive.\n\nThis amendment revises the applicability to S-2B aircraft and updates the referenced requirement document and FAA airworthiness directive. The improved rear lower fuselage wing fitting was installed commencing with aircraft serial number 5337, not 5349 as stated in the earlier directive.\n\nAmendment 1 of this Airworthiness Directive became effective on 6 November 1997\\. The original issue of this Airworthiness Directive became effective on 17 July 1996.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendments revised the applicability and updated referenced documents: the improved rear lower fuselage fitting was confirmed as installed from S-2B serial number 5337 (not 5349), so aircraft serials 5337 and later are excluded from the inspection/repair requirement (Applicability; Amendment). The Requirement and Compliance paragraphs now direct inspections within 50 hours and re-inspection every 50 hours until modified per Aviat Service Bulletin No.25 (Requirement; Compliance). This narrows the obligated subset of S-2B aircraft and updates the compliance references, shifting inspection and repair costs onto operators of earlier-serial aircraft (Background; Amendment)."},"complexity_factors":["Cross-references to external documents (Aviat Aircraft Service Bulletin No.25 and FAA AD 96-12-03 R2) for the detailed repair scheme and accomplishment instructions, requiring operators to obtain and follow another document.","Fleet-specific applicability exception (excludes S-2B aircraft from serial number 5337 onwards), requiring operators to verify serial numbers and individual aircraft configuration.","Short inspection and re-inspection interval (inspect within 50 hours and re-inspect at intervals not exceeding 50 hours until modification), increasing operational and maintenance scheduling burden.","Technical repair action defined by a particular paragraph (repair scheme at paragraph 6.C. of the requirement document), creating dependency on a specific section of the service bulletin for compliance.","Safety-critical consequence (risk of in-flight wing separation) increases regulatory enforcement and recordkeeping expectations for operators and maintenance organisations.","History of amendments and a corrected serial-number reference increases potential for compliance confusion among operators who relied on earlier versions."],"plain_english_summary":"Requires owners/operators of Pitts S-1 and S-2 aeroplanes (except S-2B serial 5337 and later) to inspect the rear lower fuselage wing fittings within 50 flight hours and then every 50 hours until repaired per the Aviat Service Bulletin; the directive references FAA AD 96-12-03 R2. A cracked fitting can lead to in-flight wing separation, so operators pay for inspections, repairs and scheduling of recurring maintenance to meet the directive."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope — safety inspections for cracked wing fittings on Pitts aircraft. It merely corrects a technical error in the serial number cutoff for exempt aircraft (changing from 5349 to 5337) and updates referenced document versions. The core purpose remains unchanged."},"complexity_factors":["Single, specific mechanical issue (cracked wing fittings)","Clear applicability clause with one explicit exemption (S-2B serial 5337+)","Straightforward compliance timeline (50 hours initial, then recurring)","Only one referenced technical document (Aviat Service Bulletin No. 25)","No nested definitions, cross-references to other legislation, or conditional logic beyond the serial number exemption","Background and amendment history provided in plain language"],"plain_english_summary":"This CASA Airworthiness Directive mandates repetitive inspections of the rear lower fuselage wing fittings on Pitts S‑1 and S‑2 aeroplanes (except S‑2B serials 5337 and above) to detect cracks that could cause wing separation. Inspections follow Aviat Service Bulletin No. 25 and must be done every 50 flying hours until a permanent repair/modification is installed.\n\nIt corrects the earlier amendment’s exemption serial number."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pitts-s-2-17-amdt-2-rear-lower-fuselage-wing-fittings","history":"/api/acts/ad-pitts-s-2-17-amdt-2-rear-lower-fuselage-wing-fittings/history","analysis":"/api/acts/ad-pitts-s-2-17-amdt-2-rear-lower-fuselage-wing-fittings/analysis","conflicts":"/api/acts/ad-pitts-s-2-17-amdt-2-rear-lower-fuselage-wing-fittings/conflicts","importantCases":"/api/acts/ad-pitts-s-2-17-amdt-2-rear-lower-fuselage-wing-fittings/important-cases","documents":"/api/acts/ad-pitts-s-2-17-amdt-2-rear-lower-fuselage-wing-fittings/documents"}}