{"id":"F2006B01839","name":"AD/A109/9 - Engine Mount Installation","slug":"ad-a109-9-engine-mount-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41037,"registerId":"commonwealth-F2006B01839-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/A109/9 - Engine Mount Installation","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 6/1987,Rotorcraft,Agusta A109 Series Helicopters,Engine Mount Installation,9\ntitle: Airworthiness Directive - AD/A109/9 - Engine Mount Installation\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/A109/9 Engine Mount Installation 6/87\n\nApplicability: All models A109A and A109AII up to and including S/N 7361 except S/N 7359. Requirement:               Action in accordance with Bollettino Tecnico 109-61 Part I and Part II.\n\nCompliance: Within 100 hours’ time in service after 4 June 1987 or at the next scheduled inspection for Maintenance Release issue after 4 June 1987, whichever is later.\n\n \n\nNote: RAI AD 87-43/109-42 refers.\n\n \n\nBackground: Chafing of an oil scavenge line against a mount leg has initiated corrosion which has in one case penetrated through the tubing.\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":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in a specific aircraft model. It has not expanded beyond its original purpose of mandating inspection and repair of engine mount oil line chafing."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 1 defined applicability criterion (serial number range)","Single compliance pathway with straightforward alternative timing","No cross-references to other legislation or complex conditional logic","Simple cause-and-effect background explanation","Refers to external technical document but does not reproduce its contents"],"plain_english_summary":"This CASA safety order requires owners/operators of Agusta A109A and A109AII helicopters (serials up to 7361, except 7359) to inspect and rectify engine‑mount installations per Bollettino Tecnico 109‑61 Parts I & II. Work must be done within 100 flight hours after 4 June 1987 or at the next Maintenance Release, whichever is later. It addresses oil‑line chafing and corrosion that can cause engine damage or failure."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"Scope remains limited to the listed A109A and A109AII airframes (up to S/N 7361 except S/N 7359) and prescribes the manufacturer’s installation action to prevent oil-scavenge line chafing; the directive does not expand applicability beyond those models/serial numbers."},"complexity_factors":["Narrow applicability to specific models and serial numbers (Applicability)","Action specified by an external manufacturer bulletin rather than detailed technical steps in the directive (Requirement: Bollettino Tecnico 109-61 Part I & II)","Clear, short compliance window tied to flight hours or next scheduled inspection (Compliance)","Technical maintenance task requires qualified maintenance organisations and possible parts/inspection work","Regulatory enforcement by CASA and implication of Maintenance Release paperwork"],"plain_english_summary":"Requires specified Agusta A109A and A109AII helicopters (all up to S/N 7361 except S/N 7359) to have an engine‑mount installation carried out per Bollettino Tecnico 109‑61 Part I & II to address oil‑scavenge line chafing and corrosion. Operators and approved maintenance organisations must complete the work within 100 hours’ time‑in‑service after 4 June 1987 or at the next scheduled inspection for issuing a Maintenance Release; operators bear the direct compliance cost and CASA enforces the directive."}},"importantCases":[],"_links":{"self":"/api/acts/ad-a109-9-engine-mount-installation","history":"/api/acts/ad-a109-9-engine-mount-installation/history","analysis":"/api/acts/ad-a109-9-engine-mount-installation/analysis","conflicts":"/api/acts/ad-a109-9-engine-mount-installation/conflicts","importantCases":"/api/acts/ad-a109-9-engine-mount-installation/important-cases","documents":"/api/acts/ad-a109-9-engine-mount-installation/documents"}}