{"id":"F2006B11244","name":"AD/M20/4 - Wing Skin at Station 59.25 - Modification","slug":"ad-m20-4-wing-skin-at-station-59-25-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56964,"registerId":"commonwealth-F2006B11244-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/M20/4 - Wing Skin at Station 59.25 - 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)  Mooney M20 Series Aeroplanes\n\n \n\nAD/M20/4 Wing Skin at Station 59.25 - Modification 9/62\n\nApplicability: All model M20-B with S/Nos. 1702 to 1763 except 1703, 1708, 1709, 1710, 1711,\n\n1715, 1730, 1731, 1750 and 1759.\n\n \n\nDocument: Mooney SB 20-100. Compliance:  Forthwith.\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":1695},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This directive remains precisely targeted at its original purpose: addressing a specific structural defect in a limited subset of Mooney M20-B aircraft. There is no expansion beyond the technical safety issue identified in the referenced service bulletin."},"complexity_factors":["Extremely brief substantive text (approximately 60 words)","Single compliance action with clear external technical reference (Mooney SB 20-100)","Specific applicability limited to defined serial number range with 10 explicit exceptions","No conditional logic, definitions, or cross-references to other legislative instruments"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations.\n\n**What it requires:** Owners and operators of specific Mooney M20-B aeroplanes must modify the wing skin at a specific location (\"Station 59.25\") in accordance with Mooney Service Bulletin 20-100.\n\n**Who it affects:** Only Mooney M20-B aircraft with serial numbers 1702 to 1763, **except** for serial numbers 1703, 1708, 1709, 1710, 1711, 1715, 1730, 1731, 1750, and 1759.\n\n**When:** Immediately (\"forthwith\"). This means the aircraft cannot be flown until the modification is completed.\n\n**Why it matters:** ADs address unsafe conditions in aircraft. This directive prevents potential structural failure by ensuring the wing skin is reinforced or repaired at a critical point identified by the manufacturer."}},"importantCases":[],"_links":{"self":"/api/acts/ad-m20-4-wing-skin-at-station-59-25-modification","history":"/api/acts/ad-m20-4-wing-skin-at-station-59-25-modification/history","analysis":"/api/acts/ad-m20-4-wing-skin-at-station-59-25-modification/analysis","conflicts":"/api/acts/ad-m20-4-wing-skin-at-station-59-25-modification/conflicts","importantCases":"/api/acts/ad-m20-4-wing-skin-at-station-59-25-modification/important-cases","documents":"/api/acts/ad-m20-4-wing-skin-at-station-59-25-modification/documents"}}