{"id":"F2006B07338","name":"AD/TB20/33 - Upper Attachment of Front Seat Belts","slug":"ad-tb20-33-upper-attachment-of-front-seat-belts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49402,"registerId":"commonwealth-F2006B07338-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TB20/33 - Upper Attachment of Front Seat Belts","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/TB20/33 Upper Attachment of Front Seat Belts 11/96 DM\n\nApplicability: S/Nos. 1 to 1701, 1707 to 1750, 1758 to 1763, 1767 and 1769. Requirement:  Action in accordance with Socata SB 10-103-25.\n\nNote: DGAC AD 96-143(A) refers.\n\n \n\nCompliance: Within 50 hours time in service, or 30 days, after 14 August 1996 whichever occurs first.\n\n \n\nBackground: This Directive is issued to ensure the integrity of the upper attachment of the front seat belts.\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":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive focused specifically on seat belt attachments. It has not expanded beyond its original narrow technical purpose."},"complexity_factors":["Very short document (under 200 words)","Only one substantive requirement (comply with manufacturer service bulletin)","Simple applicability list (serial number ranges)","Single compliance condition with clear deadline","No defined terms, cross-references to other legislation, or conditional logic beyond the applicability criteria"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:** It requires owners or operators of certain Socata TB20 Trinidad aeroplanes to inspect and fix the upper attachment point of the front seat belts. The work must follow instructions in a manufacturer service bulletin (Socata SB 10-103-25).\n\n**Who it affects:** Anyone who owns or operates a Socata TB20 aircraft with serial numbers 1–1701, 1707–1750, 1758–1763, 1767, or 1769.\n\n**Why it matters:** Faulty seat belt attachments could fail in an accident, putting pilots and front-seat passengers at serious risk of injury or death. This directive forces a fix before the problem causes an accident.\n\n**When it had to be done:** Within 50 flight hours or 30 days after 14 August 1996 — whichever came first. (This is now historical, but shows the urgency.)"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD’s scope is consistent with its stated purpose: it applies to a defined set of TB20 serial numbers and mandates corrective action per the manufacturer’s Service Bulletin to ensure the integrity of the upper attachment of front seat belts (Applicability; Requirement; Background). There is no internal indication in the text that the instrument’s scope was broadened or narrowed from that stated purpose."},"complexity_factors":["Narrow applicability limited to specific serial-number ranges (Applicability).","Mandates compliance with an external document (Socata SB 10-103-25) rather than setting technical steps in the AD itself (Requirement).","Short, fixed compliance window with an either/or rule (50 hours TIS or 30 days after 14 Aug 1996, whichever occurs first) (Compliance).","Reference to a related foreign AD (DGAC AD 96-143(A)) that may require cross-checking but is not elaborated here (Note)."],"plain_english_summary":"This AD (AD/TB20/33) mandates owners/operators of the listed Socata TB20 serial numbers to carry out the inspection/rectification in Socata SB 10-103-25 to ensure the integrity of the upper attachment of the front seat belts.  \n\nWork must be done within 50 hours TIS or 30 days after 14 Aug 1996 (whichever is earlier); costs and scheduling burdens fall to the owners/operators, and maintenance must follow the manufacturer’s Service Bulletin."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tb20-33-upper-attachment-of-front-seat-belts","history":"/api/acts/ad-tb20-33-upper-attachment-of-front-seat-belts/history","analysis":"/api/acts/ad-tb20-33-upper-attachment-of-front-seat-belts/analysis","conflicts":"/api/acts/ad-tb20-33-upper-attachment-of-front-seat-belts/conflicts","importantCases":"/api/acts/ad-tb20-33-upper-attachment-of-front-seat-belts/important-cases","documents":"/api/acts/ad-tb20-33-upper-attachment-of-front-seat-belts/documents"}}