{"id":"F2006B07270","name":"AD/TB 200/3 - Vertical Stabiliser Forward Junction Doubler","slug":"ad-tb-200-3-vertical-stabiliser-forward-junction-doubler","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49197,"registerId":"commonwealth-F2006B07270-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TB 200/3 - Vertical Stabiliser Forward Junction Doubler","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nAerospatiale (Socata) TB 200 Series Aeroplanes\n\nAD/TB 200/3 Vertical Stabiliser Forward Junction Doubler 10/99\n\nApplicability: All Model TB200 aircraft.\n\nRequirement: 1. Perform a visual inspection to verify that there is no gap between the vertical stabiliser leading edge and the fuselage.\n\nIf the inspection reveals:\n\n    there is no gap between the vertical stabiliser leading edge and the fuselage, the aircraft is considered airworthy.\n\n    b. there is a gap between the vertical stabiliser leading edge and the fuselage, before further flight, contact the manufacturer.\n\n    2. Check through the air cooling oval hole, located on the leading edge of the vertical stabiliser, the presence of the vertical stabiliser forward junction doubler.\n\nIf the inspection reveals:\n\n    the vertical stabiliser small spar junction doubler is installed, return the aircraft to service.\n\n    b. the absence of the vertical stabiliser forward junction doubler, before further flight, contact the manufacturer.\n\nNote 1: Model TB200 aircraft were subject to the requirements of Direct Mail AD/TB 20/34, and are now subject to the requirements of this Directive which is specific to the Model TB200.\n\nNote 2: DGAC AD T1999-319(A) refers.\n\nCompliance: 1. At each pre-flight inspection after 7 October 1999; until Requirement 2 is accomplished.\n\n2. Within 50 hours time in service after 7 October 1999, or at the next periodic inspection after 7 October 1999, whichever occurs first; unless already accomplished.\n\nNote: This Directive shall be entered on the Maintenance release as maintenance required. The visual inspection required by Requirement 1 may be performed by the Pilot in Command, in which case certification is to be made by entering AD/TB200/3 against the daily inspection certification of the Maintenance Release. A copy of this Airworthiness Directive is to be kept in the aircraft.\n\nThis Airworthiness Directive becomes effective on 7 October 1999.\n\nBackground: The DGAC received a report that indicated the vertical stabiliser forward junction doubler was missing on a Model TB10 aircraft.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"Note 1 states TB200 aircraft were previously subject to Direct Mail AD/TB 20/34 but are now governed by this Directive specific to Model TB200. That narrows the directive's scope from the earlier, broader mailing to a model-specific AD and formalises inspection and reporting requirements for TB200s."},"complexity_factors":["Narrow applicability: only Model TB200 aircraft (single model reduces scope complexity)","Simple, non-technical compliance: visual inspections rather than intrusive tests","Limited compliance timing: recurrent pre-flight checks until corrective action, and a one-off timed inspection (within 50 hours or next periodic inspection)","Low procedural discretion: directs contact with manufacturer when non-compliance is found","Administrative requirement: entry on Maintenance Release and retention of a copy of the Directive","Delegation allowed: Pilot in Command may perform the visual pre-flight check (affects who signs the release)"],"plain_english_summary":"This Airworthiness Directive applies to all Aerospatiale (Socata) TB200 aircraft and requires operators to verify there is no gap at the vertical stabiliser leading edge and to confirm the presence of the forward junction (small spar) doubler by visual inspection. If a gap or the doubler is missing, the aircraft must not fly further until the manufacturer is contacted.\n\nIt matters because it enforces a simple pre-flight and short-term inspection sequence to detect a missing structural reinforcement reported on a related model."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope — addressing a specific structural defect in a single aircraft model (TB200). It replaced an earlier broader directive (AD/TB 20/34) that covered multiple models, but this change actually narrowed and clarified the scope rather than expanding it. The directive remains tightly focused on the vertical stabiliser junction issue."},"complexity_factors":["Single aircraft model applicability (TB200 only)","Only two inspection requirements with binary outcomes (present/absent, gap/no gap)","Clear conditional logic with only two branches per requirement","Minimal cross-referencing (one reference to French aviation authority DGAC and previous directive AD/TB 20/34)","Short document (approximately 300 words)","Only one defined technical term ('doubler' — a reinforcement plate)","Simple compliance timeline with two clear deadlines"],"plain_english_summary":"The Civil Aviation Safety Authority requires owners/operators of Aerospatiale (Socata) TB 200 series aircraft to inspect the tail junction for a visible gap before every flight (from 7 Oct 1999) and to have a licensed engineer confirm a metal reinforcement plate (“doubler”) is fitted inside the tail fin within 50 flying hours or at next maintenance. Pilots may perform the visual check and log it; missing doubler or gap grounds the aircraft until the manufacturer is contacted."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tb-200-3-vertical-stabiliser-forward-junction-doubler","history":"/api/acts/ad-tb-200-3-vertical-stabiliser-forward-junction-doubler/history","analysis":"/api/acts/ad-tb-200-3-vertical-stabiliser-forward-junction-doubler/analysis","conflicts":"/api/acts/ad-tb-200-3-vertical-stabiliser-forward-junction-doubler/conflicts","importantCases":"/api/acts/ad-tb-200-3-vertical-stabiliser-forward-junction-doubler/important-cases","documents":"/api/acts/ad-tb-200-3-vertical-stabiliser-forward-junction-doubler/documents"}}