{"id":"F2006B03579","name":"AD/BEA 121/15 - Flap Actuating Lever Assemblies","slug":"ad-bea-121-15-flap-actuating-lever-assemblies","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43146,"registerId":"commonwealth-F2006B03579-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEA 121/15 - Flap Actuating Lever Assemblies","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\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)  Beagle B121 (Pup) Series Aeroplanes\n\n \n\nAD/BEA 121/15 Flap Actuating Lever Assemblies 4/75\n\nApplicability: All series 1, 2 and 3 aeroplanes.\n\n \n\nRequirement: Action in accordance with Scottish Aviation SB No. B121/61.\n\n \n\nCompliance: Within 25 hours time in service after 19 May 1975 and thereafter at intervals not exceeding 100 hours time in service.\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\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, single-issue airworthiness directive from 1975 addressing a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original purpose of ensuring flap lever assembly safety in Beagle B121 aircraft."},"complexity_factors":["Extremely short document (under 200 words)","Only 4 operative provisions: applicability, requirement, compliance timing, and reference to external technical document","No defined terms section — all language is plain technical aviation terminology","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","Simple temporal trigger (25 hours after fixed date, then recurring 100-hour intervals)","Single external reference (Scottish Aviation SB B121/61) — the actual technical work is delegated to that document"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for a specific type of aircraft.\n\n**What it does:** This directive requires owners and operators of **Beagle B121 (Pup) Series aeroplanes** to inspect or replace their **flap actuating lever assemblies** (the mechanical parts that control the flaps — the movable surfaces on the wings that help with takeoff and landing).\n\n**Who must follow it:** Anyone operating Series 1, 2, or 3 Beagle B121 Pup aircraft.\n\n**What action is required:** Operators must follow the instructions in **Scottish Aviation Service Bulletin No. B121/61** (a technical notice from the aircraft's original manufacturer).\n\n**When it must be done:**\n- **First time:** Within 25 hours of flying time after 19 May 1975\n- **Ongoing:** Repeated every 100 hours of flying time thereafter\n\n**Why it matters:** Flap failures can be catastrophic during takeoff or landing. This directive ensures a known mechanical defect is caught before it causes an accident. Non-compliance means the aircraft cannot legally fly in Australian airspace."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"Based solely on the text provided, there is no indication that the AD changes scope from an earlier statement of intent. The AD explicitly sets applicability (all series 1, 2 and 3 aircraft), prescribes the required action by reference to Scottish Aviation SB No. B121/61, and fixes compliance intervals (initial within 25 hours after 19 May 1975, then at intervals not exceeding 100 hours). The directive therefore defines its scope and obligations within the document; no textual evidence in the source indicates a change from an original or prior scope."},"complexity_factors":["Short, narrowly targeted directive with a single mandatory action (low complexity).","Relies on an external technical document (Scottish Aviation SB No. B121/61) for procedural detail, creating a dependency on another source.","Time-based compliance schedule with an immediate short-term deadline (25 hours) and recurring intervals (100 hours), which introduces operational scheduling complexity for operators.","Limited applicability to a defined subset of aircraft (series 1, 2 and 3), reducing scope complexity.","Regulatory placement under Civil Aviation Regulations Part 39 references broader enforcement context that is not contained in the AD itself."],"plain_english_summary":"This airworthiness directive makes Scottish Aviation Service Bulletin No. B121/61 mandatory for Beagle B121 (Pup) series 1–3 aircraft, requiring the specified maintenance within 25 hours TIS after 19 May 1975 and thereafter at intervals not exceeding 100 hours TIS.  \n\nIt affects aircraft owners/operators and maintenance organisations by converting a manufacturer bulletin into a regulatory obligation, imposing recurring downtime, labour and parts costs, and shifting maintenance scheduling and workload to comply with the mandated intervals."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bea-121-15-flap-actuating-lever-assemblies","history":"/api/acts/ad-bea-121-15-flap-actuating-lever-assemblies/history","analysis":"/api/acts/ad-bea-121-15-flap-actuating-lever-assemblies/analysis","conflicts":"/api/acts/ad-bea-121-15-flap-actuating-lever-assemblies/conflicts","importantCases":"/api/acts/ad-bea-121-15-flap-actuating-lever-assemblies/important-cases","documents":"/api/acts/ad-bea-121-15-flap-actuating-lever-assemblies/documents"}}