{"id":"F2006B01811","name":"AD/A109/26 - Hydraulic System Return Line","slug":"ad-a109-26-hydraulic-system-return-line","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41009,"registerId":"commonwealth-F2006B01811-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/A109/26 - Hydraulic System Return Line","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-description: CASA Airworthiness Directive\nmeta-generator: Aspose.Words for .NET 22.10.0\nmeta-keywords: Issue 4/1996,Rotorcraft,Agusta A109 Series Helicopters,Hydraulic System Return Line,26\ntitle: Airworthiness Directive - AD/A109/26 - Hydraulic System Return Line\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Agusta A109 Series Helicopters\n\n \n\nAD/A109/26 Hydraulic System Return Line 4/96\n\nApplicability: All model A109AII and A109C S/N range as listed in the Requirement Document. Requirement:               Unless previously carried out, action in accordance with Agusta Bollettino Technico\n\n109-98 Rev A dated October 26, 1995.\n\n \n\nCompliance: Prior to 30 June 1996.\n\n \n\nBackground: The manufacturer has advised that disconnection of the quick release coupling in the number 1 hydraulic return line will cause lock-up of the hydraulic system. This condition can easily be detected if the flight manual preflight procedures are being followed.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2250},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific mechanical defect (hydraulic coupling disconnection) in defined helicopter models. The scope remains tightly focused on the original safety issue without expansion into unrelated operational or maintenance areas."},"complexity_factors":["Single page document with minimal procedural text","Only one substantive requirement (compliance with external manufacturer bulletin)","Straightforward applicability limited to specific helicopter models and serial number ranges","No conditional logic, exceptions, or nested provisions within the directive itself","Minor complexity from external reference to Italian technical bulletin (Bollettino Technico)"],"plain_english_summary":"A CASA Airworthiness Directive requires owners/operators of specified Agusta A109AII and A109C helicopters to inspect and modify the number 1 hydraulic return line quick‑release coupling per Agusta Bollettino Tecnico 109‑98 Rev A.  \n\nThe mandated work (to prevent a coupling disconnection that can lock the hydraulic system and risk loss of control) had to be completed by 30 June 1996."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a109-26-hydraulic-system-return-line","history":"/api/acts/ad-a109-26-hydraulic-system-return-line/history","analysis":"/api/acts/ad-a109-26-hydraulic-system-return-line/analysis","conflicts":"/api/acts/ad-a109-26-hydraulic-system-return-line/conflicts","importantCases":"/api/acts/ad-a109-26-hydraulic-system-return-line/important-cases","documents":"/api/acts/ad-a109-26-hydraulic-system-return-line/documents"}}