{"id":"F2006B07327","name":"AD/TB20/23 - Console Attachment","slug":"ad-tb20-23-console-attachment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49367,"registerId":"commonwealth-F2006B07327-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TB20/23 - Console 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/TB20/23 Console Attachment 11/91\n\nApplicability: Model TB20 and TB21 with serial numbers 1 through 1286.\n\n \n\nRequirement: Action in accordance with the Technical Requirement of DGAC AD 91-160 (A).\n\nNote: SOCATA TB aircraft SB 49 refers.\n\nCompliance: Within 50 hours time in service after 31 October 1991, and thereafter at intervals not to exceed 200 hours time in service; until Kit No. 9172 is installed.\n\n \n\nBackground: Cracks have been reported on frame No. 0 at the nose gear mount lower attachments.\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 directive keeps scope focused on TB20 and TB21 aeroplanes serial numbers 1–1286 and on addressing cracks at frame No. 0 at the nose-gear mount lower attachments (Applicability; Background). It does not expand or narrow applicability beyond those serial numbers, and it prescribes inspections until a specific corrective kit is installed (Compliance), which aligns with the instrument's stated purpose rather than changing it."},"complexity_factors":["Cross-reference to an external foreign technical requirement (DGAC AD 91-160 (A)) rather than specifying remedial steps in full (Requirement).","Recurring inspection schedule with a terminating condition contingent on installation of a specified kit (Compliance).","Applicability limited by model and serial-number range, requiring operators to check serial numbers (Applicability).","Related service bulletin referenced (SOCATA SB 49) but not reproduced, requiring additional document consultation (Requirement / Note)."],"plain_english_summary":"This Airworthiness Directive affects SOCATA TB20 and TB21 aeroplanes serial numbers 1–1286 and requires recurring inspections of frame No. 0 at the nose‑gear lower attachments for reported cracking. Inspections start within 50 hours TIS after 31 Oct 1991 and repeat at intervals not exceeding 200 hours until Kit No. 9172 is installed.\n\nOwners/operators pay for inspections, repairs, and any kit installation; fitting Kit No. 9172 ends the recurring inspection requirement."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific airframe defect in specific aircraft. It has not expanded beyond its original purpose of mandating inspection/repair of nose gear attachment cracks."},"complexity_factors":["Single, specific applicability (two models, defined serial number range)","One primary requirement referencing an external technical document (DGAC AD 91-160 (A))","Simple compliance timeline: initial deadline + recurring interval + termination condition","No defined terms section, no cross-references to other legislation, no conditional exceptions","Background provided in plain language (one sentence)","Total length: approximately 150 words of substantive content"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires aircraft owners to fix a specific mechanical problem.\n\n**What it does:**\n- **Targets:** Aerospatiale (Socata) TB20 and TB21 Trinidad series aeroplanes with serial numbers 1 through 1286.\n- **The problem:** Cracks have been found on \"frame No. 0\" — a structural frame near where the nose landing gear attaches to the aircraft body. This is a critical safety issue because the nose gear supports the aircraft during takeoff, landing, and ground movement.\n- **What must be done:** Aircraft operators must follow the technical instructions in a French aviation safety document (DGAC AD 91-160 (A)) to inspect or repair this area.\n- **When:** First inspection must happen within 50 flight hours after 31 October 1991, then repeated every 200 flight hours thereafter.\n- **When it stops:** These repeated inspections can stop once \"Kit No. 9172\" — a specific repair kit — is installed.\n\n**Who it affects:** Owners and operators of these specific Socata TB aircraft in Australia.\n\n**Why it matters:** Cracks in the nose gear attachment can lead to gear collapse during landing or taxiing, potentially causing serious accidents. This directive ensures the problem is caught before it becomes dangerous."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tb20-23-console-attachment","history":"/api/acts/ad-tb20-23-console-attachment/history","analysis":"/api/acts/ad-tb20-23-console-attachment/analysis","conflicts":"/api/acts/ad-tb20-23-console-attachment/conflicts","importantCases":"/api/acts/ad-tb20-23-console-attachment/important-cases","documents":"/api/acts/ad-tb20-23-console-attachment/documents"}}