{"id":"F2006B01805","name":"AD/A109/20 - Main Rotor Hydraulic Actuators","slug":"ad-a109-20-main-rotor-hydraulic-actuators","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41003,"registerId":"commonwealth-F2006B01805-current","compilationNumber":null,"startDate":"2026-04-01","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/A109/20 - Main Rotor Hydraulic Actuators","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 1/1994,Rotorcraft,Agusta A109 Series Helicopters,Main Rotor Hydraulic Actuators,20\ntitle: Airworthiness Directive - AD/A109/20 - Main Rotor Hydraulic Actuators\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/A109/20 Main Rotor Hydraulic Actuators 1/94\n\nDM\n\nApplicability:  All model A109A, A109AII and A109C series up to and including serial number 7670 excepting for serial numbers 7450, 7630, 7633, 7645, 7651, 7654 and 7663 which are excluded from this directive.\n\n \n\nRequirement: Unless previously carried out, action in accordance with Agusta mandatory Bollettico Technico No 109-94.\n\n \n\nCompliance: As specified in the requirement document with a revised effective date of 19 November 1993.\n\n \n\nBackground:  The manufacturer has advised that during routine maintenance the retaining bolts from the main rotor hydraulic servo actuator had suffered loss of bolt torque.\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":1419},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This directive maintains its original scope as a targeted safety intervention addressing a specific mechanical defect (loss of bolt torque in main rotor hydraulic actuators) in identified helicopter models. There is no evidence of scope expansion beyond the original airworthiness safety purpose."},"complexity_factors":["References external technical document (Agusta Bollettico Technico No 109-94) without reproducing its contents, requiring operators to source separate manufacturer documentation","Specific serial number exclusions (7 individual serial numbers exempted from an otherwise blanket applicability)","Requires cross-referencing Part 39 of the Civil Aviation Regulations 1998 for enforcement context","Conditional compliance clause ('Unless previously carried out')"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Agusta A109A/A109AII/A109C helicopters (serials up to 7670, with certain serials excluded) to inspect and correct the main rotor hydraulic actuator retaining-bolt torque per Agusta Bollettino Technico No. 109-94. It responds to discovered bolt loosening that could cause main-rotor control failure; compliance was required by 19 November 1993."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a109-20-main-rotor-hydraulic-actuators","history":"/api/acts/ad-a109-20-main-rotor-hydraulic-actuators/history","analysis":"/api/acts/ad-a109-20-main-rotor-hydraulic-actuators/analysis","conflicts":"/api/acts/ad-a109-20-main-rotor-hydraulic-actuators/conflicts","importantCases":"/api/acts/ad-a109-20-main-rotor-hydraulic-actuators/important-cases","documents":"/api/acts/ad-a109-20-main-rotor-hydraulic-actuators/documents"}}