{"id":"F2006L02497","name":"AD/AC/100 - Aileron Inboard and Centre Hinge Support Structure","slug":"ad-ac-100-aileron-inboard-and-centre-hinge-support-structure","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":59699,"registerId":"commonwealth-F2006L02497-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Twin Commander (Gulfstream/Rockwell/ Aer","sectionType":"division","heading":"Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes","content":"### Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes\n\n| AD/AC/100 | Aileron Inboard and CentreHinge Support Structure | 9/2006 |\n| --------- | ------------------------------------------------- | ------ |\n\n| Applicability: | All Model 690, 690A, and 690B aircraft.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | Visually inspect, using fluorescent dye penetrant method, the support structures for the inboard and centre aileron hinge fittings on both wings, in accordance with Twin Commander Aircraft LLC Alert Service Bulletin (ASB) 236A and ASB 238, both dated 21 December 2004, as applicable.If no cracks are evident during the above inspection, before further flight, reinforce the support structures for the inboard and centre aileron hinge fittings that are crack free, in accordance with ASB 236A and 238, as applicable.If cracks are evident during the above inspection, before further flight, replace and reinforce the cracked support structures for the inboard and outboard hinge fittings, in accordance with ASB 236A and ASB 238, as applicable.Note: FAA AD 2006-15-01 Amdt 39-14681. |\n| Compliance:    | Unless already accomplished, within 150 hours time in service or 12 months after 31 August 2006, whichever occurs first.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |\n|                | This Airworthiness Directive becomes effective on 31 August 2006.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n| Background:    | The FAA received reports of cracks in the support structures for the inboard and centre aileron hinge fittings on both wings. The actions specified in this Directive are intended to detect and correct cracks in the support structures, which could result in aileron failure. Aileron failure could lead to reduced controllability or loss of control of the aircraft.                                                                                                                                                                                                                                                                                                                                                                                                                                  |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n21 July 2006","sortOrder":0},{"sectionNumber":"AD/AC/100","sectionType":"part","heading":"AD/AC/100","content":"## AD/AC/100","sortOrder":1},{"sectionNumber":"Aileron Inboard and CentreHinge Support ","sectionType":"part","heading":"Aileron Inboard and CentreHinge Support Structure","content":"## Aileron Inboard and Centre  \nHinge Support Structure","sortOrder":2},{"sectionNumber":"9/2006","sectionType":"part","heading":"9/2006","content":"## 9/2006","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive implements targeted inspection and corrective measures for specified Twin Commander models to address reported cracks; it does not expand the population or introduce new categories of regulated activity beyond the original safety objective described in the instrument."},"complexity_factors":["Narrow applicability — only Model 690, 690A and 690B aircraft are affected (simple target population).","Prescriptive inspection method — requires fluorescent dye penetrant inspection (specialist technique, modest technical burden).","Conditional corrective actions — reinforce if no cracks, replace and reinforce if cracks are found (binary decision after inspection).","References manufacturer service instructions — compliance is performed in accordance with Twin Commander ASB 236A and ASB 238 (dependency on external documents).","Clear compliance deadline — 150 hours TIS or 12 months after 31 August 2006 (firm scheduling constraint).","Safety‑critical consequence — aileron failure risk creates high operational urgency despite procedural simplicity."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Twin Commander Model 690, 690A and 690B aeroplanes to visually inspect the inboard and centre aileron hinge support structures using the fluorescent dye‑penetrant method, and then either reinforce or replace any cracked or crack‑free fittings as directed in Twin Commander Alert Service Bulletins 236A and 238. The stated purpose is to detect and correct cracks that could lead to aileron failure. Operators pay for the inspection and any reinforcement or replacement, and must comply within 150 flight hours or 12 months of 31 August 2006."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard, targeted Airworthiness Directive addressing a specific safety defect in specific aircraft models. The scope remains precisely limited to the aileron hinge support structures of the identified Twin Commander variants, consistent with the original safety concern raised by the FAA."},"complexity_factors":["Short, single-purpose directive with clear applicability (3 specific aircraft models)","Straightforward conditional logic: inspect → if cracks/replace, if no cracks/reinforce","References external technical documents (ASB 236A and ASB 238) without reproducing their content","Single compliance deadline with simple alternative calculation (150 hours OR 12 months)","No nested definitions, interpretation sections, or extensive cross-referencing to other legislation","Background explanation included in plain language"],"plain_english_summary":"This mandatory CASA Airworthiness Directive applies to Twin Commander 690/690A/690B aircraft and requires fluorescent dye-penetrant inspection of the metal supports at the inner and middle aileron hinge points. If no cracks are found the supports must be reinforced; if cracks are found they must be replaced and reinforced before further flight. Compliance is required within 150 flight hours or 12 months from 31 August 2006. Noncompliance grounds an aircraft unairworthy."},"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-ac-100-aileron-inboard-and-centre-hinge-support-structure","history":"/api/acts/ad-ac-100-aileron-inboard-and-centre-hinge-support-structure/history","analysis":"/api/acts/ad-ac-100-aileron-inboard-and-centre-hinge-support-structure/analysis","conflicts":"/api/acts/ad-ac-100-aileron-inboard-and-centre-hinge-support-structure/conflicts","importantCases":"/api/acts/ad-ac-100-aileron-inboard-and-centre-hinge-support-structure/important-cases","documents":"/api/acts/ad-ac-100-aileron-inboard-and-centre-hinge-support-structure/documents"}}