{"id":"F2006B07334","name":"AD/TB20/3 - Elevator/Elevator Tab Control Attachment Inspection and Modification","slug":"ad-tb20-3-elevator-elevator-tab-control-attachment-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49388,"registerId":"commonwealth-F2006B07334-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TB20/3 - Elevator/Elevator Tab Control Attachment Inspection and 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)  Aerospatiale (Socata) TB20 (Trinidad) Series Aeroplanes\n\n \n\nAD/TB20/3 Elevator/Elevator Tab Control Attachment\n\nInspection and Modification\n\nApplicability: All models TB20 with S/Nos up to and including 479. Requirement: Socata TB SB No. 24 Modification No. 48.\n\nCompliance: Operation 1: before further flight after 22 February 1985.\n\n \n\nOperation 2: within 100 hours time in service after 22 February 1985.\n\n \n\nBackground: Socata warns of the risk of play in the tab rod/lever attachment.\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\n4/85 TX\n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused on a specific mechanical defect in a specific aircraft model. It has not expanded beyond its original purpose of addressing the elevator tab control attachment safety issue."},"complexity_factors":["Very short document (approximately 150 words)","Only 4 defined elements: applicability, requirement, compliance, and background","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","Simple conditional logic: two-tier compliance deadline (immediate vs. 100 hours)","Single technical reference to manufacturer bulletin rather than detailed technical specifications within the document itself"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for a specific type of aircraft: the **Aerospatiale (Socata) TB20 Trinidad** series.\n\n**What it does:**\n- Requires owners and operators of these planes to inspect and modify the elevator and elevator tab control attachment — a part of the tail that helps control the aircraft's pitch (up and down movement).\n\n**Why it matters:**\n- The manufacturer (Socata) identified a safety risk: \"play\" (unwanted movement or looseness) in the connection between the tab rod and lever. This could affect the pilot's ability to control the aircraft properly.\n\n**Who must comply:**\n- Anyone operating a TB20 aircraft with **serial numbers up to and including 479**.\n\n**When it must be done:**\n- **Immediately** (before the next flight) for one part of the work (Operation 1)\n- **Within 100 hours of flying time** after 22 February 1985 for the second part (Operation 2)\n\n**How to comply:**\n- Follow the manufacturer's Service Bulletin (SB No. 24) and Modification No. 48 instructions."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive's scope is the same as stated in the instrument: all Socata TB20 aeroplanes with serial numbers up to and including 479 must undergo the inspection and modification specified in Socata TB SB No. 24, Mod No. 48. The text prescribes the actions and compliance timings (inspection before further flight after 22 February 1985; modification within 100 hours TIS after 22 February 1985) and does not expand or narrow that applicability within the provided document."},"complexity_factors":["Narrow applicability (specific aircraft model and serial number range)","Single identified defect and a single prescribed corrective action (inspection + modification via a specific service bulletin)","Two-step compliance timetable (immediate inspection before next flight; modification within 100 hours TIS)","Dependence on an external technical document (Socata TB SB No. 24 Mod No. 48) for the exact modification procedure","Operational impacts limited to maintenance downtime and parts availability rather than regulatory licensing changes","No alternative methods or exemptions set out in the text (limited discretionary complexity for operators)"],"plain_english_summary":"Owners/operators of Socata TB20 aeroplanes (serial numbers up to 479) must inspect the elevator and elevator‑tab control attachment before the next flight after 22 February 1985 and complete the prescribed modification within 100 flight hours, using Socata Service Bulletin No. 24, Mod No. 48. The work—at owner/operator expense—addresses a manufacturer‑reported risk of play in the tab rod/lever attachment that could affect safety."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tb20-3-elevator-elevator-tab-control-attachment-inspection-and-modification","history":"/api/acts/ad-tb20-3-elevator-elevator-tab-control-attachment-inspection-and-modification/history","analysis":"/api/acts/ad-tb20-3-elevator-elevator-tab-control-attachment-inspection-and-modification/analysis","conflicts":"/api/acts/ad-tb20-3-elevator-elevator-tab-control-attachment-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-tb20-3-elevator-elevator-tab-control-attachment-inspection-and-modification/important-cases","documents":"/api/acts/ad-tb20-3-elevator-elevator-tab-control-attachment-inspection-and-modification/documents"}}