{"id":"F2006B07297","name":"AD/TB10/29 - Vertical Stabiliser Forward Junction Doubler","slug":"ad-tb10-29-vertical-stabiliser-forward-junction-doubler","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49273,"registerId":"commonwealth-F2006B07297-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TB10/29 - 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) TB9 and TB10 (Tobago) Series Aeroplanes\n\nAD/TB10/29 Vertical Stabiliser Forward Junction Doubler 10/99 DM\n\nApplicability: All Model TB9 and TB10 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, no further action is required under this part.\n\n    b. there is a gap between the vertical stabiliser leading edge and the fuselage, before further flight, contact the manufacturer for rectification action.\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 for rectification action.\n\nNote: DGAC AD T1999-319(A) refers.\n\nCompliance: 1. At each pre-flight inspection after 18 August 1999; until Requirement 2 is accomplished.\n\n2. Within 50 hours time in service after 18 August 1999, or at the next periodic inspection after 18 August 1999, whichever occurs first.\n\nThis 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/TB10/29 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 18 August 1999.\n\nBackground: The DGAC received a report that indicated the vertical stabiliser forward junction doubler was missing on a Model TB10 aircraft.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The directive addresses a missing doubler reported on a Model TB10 but applies to all TB9 and TB10 aircraft, expanding impact beyond the single reported aircraft. It imposes recurring pre‑flight checks until a follow‑up inspection and requires manufacturer engagement for rectification where defects are found."},"complexity_factors":["Limited technical scope: two visual checks (gap and doubler presence) rather than detailed structural work","Broad applicability: affects all Model TB9 and TB10 aircraft (increases affected population)","Compliance timing rules: recurring pre‑flight checks until Requirement 2 is done and a 50‑hour or next periodic inspection deadline","Operational constraint: grounding until manufacturer rectification if defect found (creates potential downtime/cost)","Delegated inspection authority: Pilot in Command may perform Requirement 1 but must enter AD on the maintenance release (administrative step)","Dependence on manufacturer for corrective action introduces external coordination and potential delays","Recordkeeping requirement: copy of the AD must be kept on board (minor administrative burden)","Reference to foreign AD (DGAC T1999-319(A)) adds an external regulatory cross‑reference"],"plain_english_summary":"This directive requires operators of all Aerospatiale (Socata) TB9 and TB10 aircraft to visually check for any gap between the vertical stabiliser leading edge and the fuselage and to verify the presence of the vertical stabiliser forward junction doubler. If a gap or the doubler is missing, the aircraft must not fly until the manufacturer provides rectification. Pilots may perform the required pre‑flight check, but the maintenance release must record the AD and operators bear the cost and downtime of any corrective work."},"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 is a targeted safety directive addressing a specific airworthiness concern (missing structural doubler) on specific aircraft models. It has not expanded beyond its original purpose of ensuring structural integrity of the vertical stabiliser junction."},"complexity_factors":["Single defined aircraft type applicability (TB9/TB10 series only)","Two sequential requirements with clear conditional logic (if/then)","Minimal cross-referencing (one reference to French authority DGAC AD T1999-319(A))","Straightforward compliance timeline with binary trigger (50 hours OR next inspection)","No nested exceptions or complex definitions section","Plain language procedural instructions suitable for pilot execution"],"plain_english_summary":"This safety order (Airworthiness Directive) requires owners/operators of Aerospatiale (Socata) TB9 and TB10 aircraft to carry out two inspections of the tail-to-fuselage attachment—one simple pre‑flight gap check (required before every flight from 18 August 1999 until the second check is done) and a maintenance inspection through an access hole to verify a reinforcing doubler (within 50 flight hours or at the next maintenance). It aims to prevent possible tail structural failure after a missing doubler was discovered."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tb10-29-vertical-stabiliser-forward-junction-doubler","history":"/api/acts/ad-tb10-29-vertical-stabiliser-forward-junction-doubler/history","analysis":"/api/acts/ad-tb10-29-vertical-stabiliser-forward-junction-doubler/analysis","conflicts":"/api/acts/ad-tb10-29-vertical-stabiliser-forward-junction-doubler/conflicts","importantCases":"/api/acts/ad-tb10-29-vertical-stabiliser-forward-junction-doubler/important-cases","documents":"/api/acts/ad-tb10-29-vertical-stabiliser-forward-junction-doubler/documents"}}