{"id":"F2006B07292","name":"AD/TB10/24 - Fin Intermediate Rib Attachment","slug":"ad-tb10-24-fin-intermediate-rib-attachment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49259,"registerId":"commonwealth-F2006B07292-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TB10/24 - Fin Intermediate Rib 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) TB9 and TB10 (Tobago) Series Aeroplanes\n\n \n\nAD/TB10/24 Fin Intermediate Rib Attachment 3/95\n\nApplicability: Model TB9, TB10 and TB200 aircraft with serial numbers 1 through 1609. Requirement:               Action in accordance with Socata Mandatory Service Bulletin 10.083.55.\n\nNote: DGAC AD 94-248(A) refers.\n\n \n\nCompliance: Unless already accomplished, as specified in the Requirement Document.\n\n \n\nBackground: The fin intermediate rib attachment rivets have been found to be susceptible to working, and loosening as a result.\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":3,"scope_assessment":{"changed":false,"description":"The instrument sets a single, specific scope: TB9, TB10 and TB200 aircraft serial numbers 1–1609, and mandates the manufacturer Service Bulletin as the required action. Nothing in the text indicates an expansion, narrowing, or amendment of that scope compared with the directive as presented here; therefore there is no evident change from an original scope within this document."},"complexity_factors":["Narrow, clearly defined applicability by model and serial number (Applicability).","Technical remedy is specified by reference to an external manufacturer document (Socata Mandatory Service Bulletin 10.083.55), so implementers must obtain and follow that document (Requirement).","Work involves structural rivets on the fin intermediate rib, requiring certified maintenance capability and possible parts procurement (Background; Requirement).","The AD text itself is brief and prescriptive, leaving limited in-text discretion but shifting detail and timing to the referenced Service Bulletin (Compliance).","Cross-reference to a foreign airworthiness directive (DGAC AD 94-248(A)) increases traceability but may add parallel documentation to consult (Note)."],"plain_english_summary":"What this directive does, mechanically\n\n- It requires owners/operators of certain Aerospatiale (Socata) TB9, TB10 and TB200 (Tobago) aeroplanes to carry out the work described in a specific manufacturer instruction: Socata Mandatory Service Bulletin 10.083.55. (Requirement)\n- The directive applies to aircraft with serial numbers 1 through 1609. (Applicability)\n- If the work has already been done, no further action is required. Compliance must be as set out in the Requirement Document. (Compliance)\n\nWhy it was issued (official reason)\n\n- The background supplied states that the fin intermediate rib attachment rivets have been found to be susceptible to working and loosening. The action specified in the Service Bulletin is intended to address that condition. (Background)\n\nWho it affects and who pays\n\n- Affected parties are the registered owners/operators of Aerospatiale (Socata) TB9, TB10 and TB200 aircraft with serial numbers 1–1609. (Applicability)\n- Mechanically, the financial and operational cost of complying (inspection, repair, replacement, downtime, parts, and labour) will fall on those owners/operators because they must implement the Service Bulletin to meet the directive. (Requirement; Applicability)\n\nWhat owners/operators must do and how decisions are made\n\n- Owners/operators must obtain and follow Socata Mandatory Service Bulletin 10.083.55 for the detailed steps and complete the required work. The Airworthiness Directive makes that manufacturer instruction mandatory for the listed aircraft. (Requirement)\n- The Compliance provision leaves no alternative procedures in this text: compliance is achieved by doing the work specified in the Requirement Document unless it is already complete. That limits discretion to the form and content of the referenced Service Bulletin. (Compliance)\n- The AD also cross-references a foreign authority document: DGAC AD 94-248(A). That indicates related action exists in the French authority’s records but this AD relies on the Socata Service Bulletin as the required action here. (Note)\n\nPractical implementation considerations and trade-offs\n\n- Access to the detailed instructions (the Service Bulletin) is necessary to implement the AD; the detailed technical steps, parts lists, and labour standard come from that document rather than this AD text. Therefore implementers must obtain the Service Bulletin before work can proceed. (Requirement)\n- The technical task concerns rivets on the fin intermediate rib attachment. Performing the work typically requires certified maintenance capability and appropriate replacement parts or repair kits; this creates a compliance burden in the form of labour, parts procurement, and aircraft downtime. (Background; Requirement)\n- Benefits are concentrated to users of the affected aircraft (reducing the risk associated with loosening rivets for those specific airframes). Costs (maintenance expense and downtime) are borne directly by those owners/operators. (Applicability; Background)\n- The AD’s mechanism — mandating a manufacturer service bulletin — centralises the technical solution with the manufacturer and gives operators a single, prescriptive source of required corrective action, while limiting alternative compliance pathways within the AD text itself. (Requirement; Compliance)\n\nImplementation and enforcement risks\n\n- Practical risks to timely compliance include availability of parts and access to appropriately certified maintenance facilities, especially for small operators or remote locations. The AD text does not specify time limits or intervals for compliance in this extract; the Service Bulletin will contain any such timing requirements. (Requirement; Compliance)\n- Because this AD points to a manufacturer Service Bulletin for the detailed remedy, the effectiveness of the AD depends on the technical adequacy of that Service Bulletin and on operators following it precisely. (Requirement)\n\nSource references (text locations)\n\n- Applicability: \"Model TB9, TB10 and TB200 aircraft with serial numbers 1 through 1609.\" (Applicability)\n- Requirement: \"Action in accordance with Socata Mandatory Service Bulletin 10.083.55.\" (Requirement)\n- Compliance: \"Unless already accomplished, as specified in the Requirement Document.\" (Compliance)\n- Background: \"The fin intermediate rib attachment rivets have been found to be susceptible to working, and loosening as a result.\" (Background)\n- Note: \"DGAC AD 94-248(A) refers.\" (Note)\n\nSummary sentence\n\n- The AD makes following Socata Mandatory Service Bulletin 10.083.55 compulsory for specified TB9/TB10/TB200 aircraft (serials 1–1609) to address rivets in the fin intermediate rib that have been found to work loose; owners/operators bear the required maintenance costs and must obtain and apply the Service Bulletin to comply. (Applicability; Requirement; Background; Compliance)"},"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 limited aircraft fleet. It has not expanded beyond its original purpose of mandating a specific structural inspection and repair."},"complexity_factors":["Extremely short document (under 200 words)","Only 3 defined elements: applicability, requirement, and compliance","No cross-references to other legislation or regulations beyond a single manufacturer service bulletin","Single, unambiguous mandatory action with no exceptions or conditional logic","No interpretation section or defined terms","Standard AD format following established aviation safety template"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to specific **Socata TB9, TB10 and TB200 aircraft** (light single-engine planes, commonly known as the 'Tobago' series) with serial numbers 1 through 1609.\n\n**What it does:**\n- Orders owners/operators to inspect and fix a specific structural problem with the **vertical fin** (the tail section that keeps the plane stable).\n- The problem: The rivets attaching an internal support rib in the fin can work loose over time, potentially compromising the aircraft's structural integrity.\n\n**What you must do:**\n- Follow the instructions in **Socata Mandatory Service Bulletin 10.083.55** (the manufacturer's official repair notice).\n- Complete the work by the deadlines specified in that bulletin unless it's already been done.\n\n**Why it matters:**\nLoose rivets in the tail structure could lead to control problems or structural failure in flight. This AD ensures the fleet is inspected and repaired before any accidents occur. It references a French aviation safety directive (DGAC AD 94-248(A)), showing this is a known international issue."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tb10-24-fin-intermediate-rib-attachment","history":"/api/acts/ad-tb10-24-fin-intermediate-rib-attachment/history","analysis":"/api/acts/ad-tb10-24-fin-intermediate-rib-attachment/analysis","conflicts":"/api/acts/ad-tb10-24-fin-intermediate-rib-attachment/conflicts","importantCases":"/api/acts/ad-tb10-24-fin-intermediate-rib-attachment/important-cases","documents":"/api/acts/ad-tb10-24-fin-intermediate-rib-attachment/documents"}}