{"id":"F2006B02211","name":"AD/AC-SNOW/20 - Aileron Hinge Bracket Bolts","slug":"ad-ac-snow-20-aileron-hinge-bracket-bolts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41441,"registerId":"commonwealth-F2006B02211-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AC-SNOW/20 - Aileron Hinge Bracket Bolts","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)  \nAyres Thrush (Snow) Commander Series Aeroplanes\n\nAD/AC-SNOW/20 Aileron Hinge Bracket Bolts 9/93 DM\n\nApplicability: All S2R-T65, \\-T34, \\-T15, \\-T11 and \\-R1820 aircraft referenced by Ayres Corporation Service Bulletin SB-AG-22.\n\nRequirement: 1. Replace the lower attachment bolts from all six aileron brackets with larger diameter bolts, in accordance with Ayres Corporation Service Bulletin SB-AG-22, within 5 flight hours after 21 June 1993; or\n\n2. (a) Replace the existing lower attachment bolts from all six aileron brackets with new bolts of the same size within 5 flight hours after 21 June 1993; and\n\n(b) Replace these new bolts with larger diameter bolts, in accordance with Ayres Corporation Service Bulletin SB-AG-22, within 120 flight hours from installation of the new bolts.\n\nCompliance: Effective from 21 June 1993.\n\nBackground: The Authority has received a report of an aircraft on which the controls became jammed in flight due to failure of the lower attachment bolts on the left hand aileron inboard and centre hinges.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1981},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific mechanical defect in defined aircraft models. It maintains its original narrow scope of ensuring airworthiness of aileron hinge assemblies."},"complexity_factors":["Two alternative compliance pathways with different flight hour deadlines","Technical aviation terminology requiring knowledge of aircraft systems","Cross-reference to external manufacturer service bulletin (SB-AG-22)","Specific applicability limited to five aircraft model variants"],"plain_english_summary":"This mandatory Airworthiness Directive requires owners/operators of Ayres Thrush Commander S2R-T65, T34, T15, T11, and R1820 aircraft to replace six lower aileron-hinge bolts to prevent in‑flight bolt failure that can jam ailerons and render the airplane uncontrollable. Compliance allows either immediate replacement with larger bolts within 5 flight hours or a temporary same-size replacement within 5 hours followed by larger bolts within 120 flight hours."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-snow-20-aileron-hinge-bracket-bolts","history":"/api/acts/ad-ac-snow-20-aileron-hinge-bracket-bolts/history","analysis":"/api/acts/ad-ac-snow-20-aileron-hinge-bracket-bolts/analysis","conflicts":"/api/acts/ad-ac-snow-20-aileron-hinge-bracket-bolts/conflicts","importantCases":"/api/acts/ad-ac-snow-20-aileron-hinge-bracket-bolts/important-cases","documents":"/api/acts/ad-ac-snow-20-aileron-hinge-bracket-bolts/documents"}}