{"id":"F2006B07344","name":"AD/TB20/39 - Nose Gear Fork","slug":"ad-tb20-39-nose-gear-fork","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49425,"registerId":"commonwealth-F2006B07344-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)  \n\nAerospatiale (Socata) TB20 (Trinidad) Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/TB20/39 Nose Gear Fork 10/2001","sectionType":"part","heading":"AD/TB20/39 Nose Gear Fork 10/2001","content":"# AD/TB20/39 Nose Gear Fork 10/2001\n\nApplicability: TB20 and TB21 aircraft with serial numbers 1893, 1894, 1896 through 1899, 1901,\n\n1902, 1904 through 2021, 2023 through 2033, 2035, 2036, and 2038.\n\nRequirement: Action in accordance with Socata Service Bulletin SB 10-119-32, dated June 2001.\n\nNote: DGAC AD 2001-304(A) refers.\n\nCompliance: At the next scheduled maintenance visit after 4 October 2001 or before 31 March 2002, whichever occurs first.\n\nThis Airworthiness Directive becomes effective on 4 October 2001.\n\nBackground: A fault in the nose gear fork manufacturing process has been identified.\n\n![Signature of David Alan Villiers Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 24 August 2001\n\n![](image.001.png)","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive addressing a specific manufacturing defect in a specific component of specific aircraft. It has not expanded beyond its original purpose of correcting the identified unsafe condition in the nose gear fork."},"complexity_factors":["Single, specific mechanical defect addressed","Limited applicability: only 2 aircraft models with explicitly listed serial numbers","One clear compliance action (follow manufacturer's Service Bulletin)","Simple compliance deadline structure (next maintenance visit OR fixed date, whichever first)","No defined terms section, no cross-references to other legislation beyond a note about a French aviation directive","Total length: approximately 200 words"],"plain_english_summary":"The Civil Aviation Safety Authority has issued a safety order after finding a manufacturing defect in the nose-gear forks of certain Socata TB20 and TB21 aeroplanes. Owners/operators of the affected serial-numbered aircraft must inspect and, if necessary, repair the forks following the manufacturer’s Service Bulletin SB 10-119-32 by the next scheduled maintenance after 4 Oct 2001 or by 31 Mar 2002, whichever is earlier. This prevents possible nose-gear failure on takeoff or landing."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The Directive applies only to the listed TB20/TB21 serial numbers and mandates the remedy set out in the Socata Service Bulletin; it does not broaden applicability or introduce new obligations beyond correcting the identified manufacturing fault (Applicability; Requirement; Background)."},"complexity_factors":["Narrow, explicitly listed applicability by serial number reduces scope and complexity (Applicability).","Single corrective action route: compliance with one Socata Service Bulletin simplifies technical requirements but creates a dependency on that external document (Requirement).","Fixed, short compliance window imposes scheduling constraints for operators (Compliance: next maintenance after 4 Oct 2001 or before 31 Mar 2002).","Legal basis is a single CASR subregulation with limited administrative discretion (opening heading referencing subreg 39.1(1)).","Practical compliance may involve parts inspection/repair costs borne by owners/operators (Requirement; Background)."],"plain_english_summary":"This AD requires certain Aerospatiale (Socata) TB20 and TB21 aircraft (listed by serial number) to have their nose-gear fork inspected or corrected in accordance with Socata Service Bulletin SB 10-119-32 (June 2001). Compliance must occur at the next scheduled maintenance after 4 October 2001 or before 31 March 2002 (Applicability; Requirement; Compliance).\n\nOwners/operators must arrange and pay for the work within that window; CASA issued the directive under CASR subregulation 39.1(1) after identifying a manufacturing fault in the nose-gear fork (Background; heading)."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-tb20-39-nose-gear-fork","history":"/api/acts/ad-tb20-39-nose-gear-fork/history","analysis":"/api/acts/ad-tb20-39-nose-gear-fork/analysis","conflicts":"/api/acts/ad-tb20-39-nose-gear-fork/conflicts","importantCases":"/api/acts/ad-tb20-39-nose-gear-fork/important-cases","documents":"/api/acts/ad-tb20-39-nose-gear-fork/documents"}}