{"id":"F2006B07190","name":"AD/SWSA226/5 - Wing Centre Section Improved Venting - Modification","slug":"ad-swsa226-5-wing-centre-section-improved-venting-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114964,"registerId":"commonwealth-F2006B07190-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SWSA226/5 - Wing Centre Section Improved Venting - Modification","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)  Fairchild (Swearingen) SA226 and SA227 Series Aeroplanes\n\n \n\n# AD/SWSA226/5 Wing Centre Section Improved Venting - Modification\n\nApplicability: Model SA226T with S/Nos. T201 to T217. Document:  Swearingen SB 57-30-3021.\n\n# 7/72\n\nCompliance: Within 100 hours time in service or 3 months whichever occurs first after 31 July 1972.\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\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1634},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This appears to be the original scope of the directive — a targeted safety modification for a specific aircraft type and production batch. There is no evidence of scope creep or expansion beyond the original wing venting issue."},"complexity_factors":["Very short directive (under 100 words of substantive content)","Single applicability criterion (specific model and serial number range)","Clear binary compliance requirement (modification must be performed)","No defined terms section or interpretive provisions","Simple time-based compliance trigger"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) requiring owners of specific aircraft to carry out a modification.\n\n**Who it affects:** Owners and operators of Fairchild Swearingen SA226T aircraft with serial numbers T201 through T217.\n\n**What it requires:** You must modify the wing centre section to improve venting (air circulation). The technical details are found in Swearingen Service Bulletin 57-30-3021.\n\n**When it had to be done:** Within 100 hours of flight time or 3 months after 31 July 1972 — whichever came first.\n\n**Why it matters:** This modification addresses a safety issue in the wing structure. Compliance is legally mandatory — flying without completing this modification would breach aviation safety laws."}},"importantCases":[],"_links":{"self":"/api/acts/ad-swsa226-5-wing-centre-section-improved-venting-modification","history":"/api/acts/ad-swsa226-5-wing-centre-section-improved-venting-modification/history","analysis":"/api/acts/ad-swsa226-5-wing-centre-section-improved-venting-modification/analysis","conflicts":"/api/acts/ad-swsa226-5-wing-centre-section-improved-venting-modification/conflicts","importantCases":"/api/acts/ad-swsa226-5-wing-centre-section-improved-venting-modification/important-cases","documents":"/api/acts/ad-swsa226-5-wing-centre-section-improved-venting-modification/documents"}}