{"id":"F2006B07354","name":"AD/TB20/8 - Aileron Balance Weight Attachment","slug":"ad-tb20-8-aileron-balance-weight-attachment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49458,"registerId":"commonwealth-F2006B07354-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TB20/8 - Aileron Balance Weight Attachment","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)  Aerospatiale (Socata) TB20 (Trinidad) Series Aeroplanes\n\n \n\nAD/TB20/8 Aileron Balance Weight Attachment 5/87\n\nApplicability: All TB20 with S/Nos 275 to 700 except S/No 343, 638, 639, 643, 644, 645, 653, 664,\n\n665, 672, 673, 683, 691, 693, 697, 698.\n\n \n\nRequirement: Action in accordance with Socata TB SB No 28.\n\n \n\nCompliance: At the next scheduled inspection for Maintenance Release issue after 7 May 1987 and thereafter at each scheduled inspection for Maintenance Release issue until modified.\n\n \n\nBackground: The manufacturer reports instances of loosening of balance weights and skin cracking in the balance weight attachment area.\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":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD does not indicate any change of scope from an earlier or original intent within the text. It sets a targeted requirement for specified TB20 serial numbers to follow Socata TB SB No 28 at scheduled Maintenance Release inspections and repeats that obligation until a modification removes it. The document neither expands nor narrows applicability beyond the listed serial numbers and exceptions, and it does not record any prior version or amendment in the text provided."},"complexity_factors":["Short, focussed directive with a single external technical reference (Socata TB SB No 28).","Specific applicability limited to a defined serial number range with enumerated exclusions.","Compliance schedule tied to an existing maintenance milestone (Maintenance Release), which is straightforward but requires knowledge of maintenance schedules.","Ambiguity in the term \"until modified\" adds a small interpretive element about when the recurring obligation ends.","No technical repair steps are in the AD itself—operators must consult an external service bulletin for procedural detail, adding dependency complexity."],"plain_english_summary":"The Civil Aviation Safety Authority requires specified Aerospatiale (Socata) TB20 aeroplanes (S/No 275–700, with listed exclusions) to have their aileron balance weight attachment inspected and treated per Socata Technical/Service Bulletin No. 28 at the next Maintenance Release after 7 May 1987 and at every subsequent Maintenance Release until the aircraft is modified to remove the requirement.\n\nThis affects owners/operators and authorised maintenance organisations, who bear the inspection/repair costs; the AD responds to manufacturer reports of loosening balance weights and skin cracking."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in a specific aircraft model. It has not expanded beyond its original purpose of ensuring aileron balance weight integrity."},"complexity_factors":["Single, specific requirement referencing an external document (Socata TB SB No. 28)","Limited applicability scope with explicit serial number exclusions","Simple compliance timeline (next scheduled inspection after fixed date, then recurring)","No defined terms section, no cross-references to other legislation","Straightforward conditional logic (applies to all in range except listed exclusions)","Total length is approximately 200 words"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\nOrders owners and operators of certain **Socata TB20 Trinidad aeroplanes** to inspect the aileron balance weight attachment (a component that helps stabilise the wing's control surfaces). They must follow the manufacturer's Service Bulletin (SB) No. 28.\n\n**Who it affects:**\n- **Aircraft:** All TB20 planes with serial numbers 275 to 700, **except** a specific list of excluded serial numbers (343, 638, 639, 643, 644, 645, 653, 664, 665, 672, 673, 683, 691, 693, 697, 698).\n- **People:** Aircraft owners, operators, and maintenance engineers responsible for keeping these planes airworthy.\n\n**Why it matters:**\nThe manufacturer reported problems where balance weights were coming loose and the surrounding metal skin was cracking. If left unchecked, this could affect aircraft control and safety. The directive requires repeated inspections at every scheduled maintenance check until a permanent fix is installed.\n\n**When to comply:**\n- First inspection: At the next scheduled maintenance check after 7 May 1987\n- Ongoing: Repeated at every scheduled maintenance check until the aircraft is modified to fix the problem permanently"}},"importantCases":[],"_links":{"self":"/api/acts/ad-tb20-8-aileron-balance-weight-attachment","history":"/api/acts/ad-tb20-8-aileron-balance-weight-attachment/history","analysis":"/api/acts/ad-tb20-8-aileron-balance-weight-attachment/analysis","conflicts":"/api/acts/ad-tb20-8-aileron-balance-weight-attachment/conflicts","importantCases":"/api/acts/ad-tb20-8-aileron-balance-weight-attachment/important-cases","documents":"/api/acts/ad-tb20-8-aileron-balance-weight-attachment/documents"}}