{"id":"F2006B11231","name":"AD/M20/24 Amdt 2 - Main Spar","slug":"ad-m20-24-amdt-2-main-spar","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56950,"registerId":"commonwealth-F2006B11231-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/M20/24 Amdt 2 - Main Spar","content":"COMMONWEALTH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)  \nMooney M20 Series Aeroplanes\n\nAD/M20/24\n\nAmdt 2\n\n  \nMain Spar 11/95\n\nApplicability: All models except M20J and subsequent, which have exceeded 5 years time in service.\n\nRequirement: Drain the fuel tanks, remove the fuel tank inspection panels, and inspect the main spar structure for signs of corrosion particularly in the area of the web stiffeners.\n\nCompliance: Before 30 September 1976, and thereafter at intervals not to exceed 3 calendar years.\n\nThe Compliance of the initial issue of this Directive remains unchanged. This Amendment is effective from 12 October 1995.\n\nBackground: The investigation of a fuel leak in a local aircraft revealed a severely corroded main spar web.\n\nAmendment 1 excluded J and K models from applicability. These models are a later build standard and no reports of spar corrosion have been received.\n\nAmendment 2 is issued to expand applicability to exclude all later models.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1441},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"The scope has been narrowed through amendments. Amendment 2 expands the exclusion of aircraft models, removing all later production models (M20J and subsequent) from the requirements, whereas earlier versions may have applied to a broader range. The directive now targets only older aircraft with demonstrated corrosion risk."},"complexity_factors":["Single, clearly defined mechanical inspection task","Simple applicability criteria based on aircraft model designation and time in service","Minimal cross-referencing to other legislation","Straightforward periodic compliance interval (3 calendar years)"],"plain_english_summary":"This airworthiness directive requires owners of older Mooney M20 variants (those in service more than five years, excluding M20J and later) to drain wing fuel tanks, remove inspection panels, and inspect the main wing spar—especially around web stiffeners—for corrosion. The first inspection was mandated by 30 September 1976 and must be repeated every three years.\n\nIt addresses a discovered severely corroded spar that could cause catastrophic wing failure, targeting only models proven at risk."}},"importantCases":[],"_links":{"self":"/api/acts/ad-m20-24-amdt-2-main-spar","history":"/api/acts/ad-m20-24-amdt-2-main-spar/history","analysis":"/api/acts/ad-m20-24-amdt-2-main-spar/analysis","conflicts":"/api/acts/ad-m20-24-amdt-2-main-spar/conflicts","importantCases":"/api/acts/ad-m20-24-amdt-2-main-spar/important-cases","documents":"/api/acts/ad-m20-24-amdt-2-main-spar/documents"}}