{"id":"F2006B06273","name":"AD/PL 12/8 Amdt 3 - Stub Wing Spar","slug":"ad-pl-12-8-amdt-3-stub-wing-spar","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47297,"registerId":"commonwealth-F2006B06273-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PL 12/8 Amdt 3 - Stub Wing Spar","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Transavia PL 12 Series Aeroplanes\n\n \n\n# AD/PL 12/8\n\nAmdt 3\n\nApplicability: All models.\n\n# Stub Wing Spar 7/90 DM\n\n \n\nRequirement: Carry out detailed visual inspection of the complete stub wing main spar for corrosion and cracking paying particular attention to the areas adjacent to the fish plates welded to the rear face of the spar web at the fuselage sides, right angle stiffener, inboard of MLG pylons and all other welds in the spar web. The inspection is to be performed after removal of the lower cowl and access panels. The use of a strong light source and sight aid is recommended. Any cracks found are to be repaired, corrosion to be removed, area blended, checked within limits, repaired as required and reprotected before further flight.\n\n \n\nCompliance: At the next scheduled inspection for issue of a Maintenance Release after 25 April 1990, and thereafter at intervals not exceeding 100 hours time in service.\n\n \n\nBackground: Amendment 3 has been issued to require further inspection of stub wing spar as a result of severe corrosion and cracking being reported in the area inboard of MLG.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"This is Amendment 3 to the original directive, explicitly expanded from earlier versions. The background states it was issued 'to require further inspection' after new reports of 'severe corrosion and cracking' emerged in areas not previously covered (specifically 'inboard of MLG' — main landing gear). The scope has grown from the original AD to cover additional inspection areas and presumably more stringent requirements."},"complexity_factors":["Single, specific technical requirement focused on one aircraft component","No defined terms section or interpretation provisions","Minimal conditional logic — straightforward 'if found, then repair' structure","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","Clear, sequential compliance requirements (initial + recurring)","Technical aviation terminology present but explained through context (fish plates, MLG pylons, blending)"],"plain_english_summary":"This CASA Airworthiness Directive mandates repetitive inspections of the stub wing spar on Transavia PL-12 (Skyfarmer) aircraft after corrosion and cracking were found near landing‑gear attachments and welds. Owners/operators must perform a detailed visual inspection (panels/cowlings removed) at the next check after 25 April 1990 and every 100 flight hours, repair or blend cracks, remove and treat corrosion, and protect the spar before flight. The AD targets operators in Australia to prevent catastrophic wing failure; Amendment 3 broadened the inspection scope."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 3 broadens inspection requirements compared with earlier issuances by requiring further, focused inspection of the stub wing spar (notably inboard of the MLG) and establishing a recurring 100‑hour inspection interval beginning at the next maintenance release after 25 April 1990 (Background; Compliance)."},"complexity_factors":["Technical inspection detail: identifies specific structural areas to examine and recommends tools (Requirement).","Recurring compliance interval: inspection mandated at next maintenance release after 25/04/1990 and every 100 hours thereafter (Compliance).","Access and labour burden: requires removal of lower cowl and access panels, increasing maintenance time and cost (Requirement; Compliance).","Repair discretion: defects must be repaired, blended, checked to limits and reprotected, requiring maintenance judgment and approved repair methods (Requirement).","Universal applicability: applies to all PL‑12 models, expanding the pool of affected operators (Applicability; Background).","Triggering history: issued in response to reported severe corrosion/cracking inboard of MLG, explaining the amendment’s scope increase (Background)."],"plain_english_summary":"This airworthiness directive requires detailed visual inspections of the Transavia PL‑12 stub wing main spar for corrosion and cracking, concentrating on welds, fish‑plate areas, the right‑angle stiffener and the area inboard of the main landing‑gear pylons. Inspections must be done after removal of the lower cowl and access panels and may use strong light and sight aids (Requirement). It applies to all models, at the next maintenance release after 25 April 1990 and then every 100 hours; defects must be repaired and reprotected before further flight (Compliance)."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-pl-12-8-amdt-3-stub-wing-spar","history":"/api/acts/ad-pl-12-8-amdt-3-stub-wing-spar/history","analysis":"/api/acts/ad-pl-12-8-amdt-3-stub-wing-spar/analysis","conflicts":"/api/acts/ad-pl-12-8-amdt-3-stub-wing-spar/conflicts","importantCases":"/api/acts/ad-pl-12-8-amdt-3-stub-wing-spar/important-cases","documents":"/api/acts/ad-pl-12-8-amdt-3-stub-wing-spar/documents"}}