{"id":"F2006B03603","name":"AD/BEA 206/1 - Rudder Mass Balance","slug":"ad-bea-206-1-rudder-mass-balance","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43194,"registerId":"commonwealth-F2006B03603-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEA 206/1 - Rudder Mass Balance","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 B206 Series Aeroplanes\n\n \n\nAD/BEA 206/1 Rudder Mass Balance 3/66\n\nApplicability: Model B206 Series 1.\n\n \n\nRequirement: Action in accordance with Beagle SB B206/1 dated 13 December 1965.\n\n \n\nCompliance: Inspect at intervals not exceeding 100 hours time in service until Beagle Mod. 440 is incorporated.\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\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive, as written, applies to Beagle B206 Series 1 aircraft and requires actions set out in Beagle SB B206/1 plus inspections every 100 hours until Beagle Mod. 440 is incorporated. There is no indication within the text that the instrument's scope departs from its stated purpose or original directive language; it sets a limited applicability, a mandatory external-service-bulletin action, and a clear inspection cadence (see \"Applicability\", \"Requirement\", and \"Compliance\" lines)."},"complexity_factors":["Narrow applicability (only Beagle B206 Series 1) reduces scope complexity (\"Applicability: Model B206 Series 1\").","Reference to an external document (Beagle SB B206/1 dated 13 December 1965) means compliance requires obtaining and applying another source, adding procedural dependence (\"Requirement: Action in accordance with Beagle SB B206/1 dated 13 December 1965\").","Simple, fixed inspection cadence (every 100 hours) until a single identified modification is fitted keeps operational rules straightforward (\"Compliance: Inspect at intervals not exceeding 100 hours ... until Beagle Mod. 440 is incorporated\").","Lack of procedural detail in the AD itself (inspection methods and mod particulars are in the service bulletin) increases compliance logistics but not legal complexity.","Temporal dependency (requirement persists until Mod. 440 is incorporated) creates an open-ended compliance duration tied to operators' choices and modification supply/availability."],"plain_english_summary":"This AD requires owners/operators of Beagle B206 Series 1 aeroplanes to comply with Beagle SB B206/1 (13 Dec 1965) to address a rudder mass‑balance issue. \n\nIt mandates inspections at intervals not exceeding 100 hours TIS until Beagle Mod. 440 is incorporated, so operators bear inspection and mod costs and have an incentive to fit Mod. 440 to end the recurring inspections."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific airworthiness concern on a specific aircraft model. It has not expanded beyond its original purpose of ensuring rudder mass balance integrity on Beagle B206 Series 1 aircraft."},"complexity_factors":["Extremely short document (under 150 words)","Only 4 operative provisions: applicability, requirement, compliance, and reference to external document","No defined terms section — uses plain aviation terminology","Single condition (inspection interval) with one terminating event (modification installation)","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","No nested exceptions or conditional logic"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires aircraft owners or operators to take specific action to fix a known safety problem.\n\n**What it does:** This directive applies specifically to **Beagle B206 Series 1 aeroplanes** (a type of small aircraft). It requires owners/operators to **inspect the rudder mass balance** — a weight attached to the aircraft's rudder that prevents dangerous vibrations or flutter at high speeds.\n\n**What action is required:**\n- **Follow the manufacturer's instructions** in Beagle Service Bulletin B206/1 (dated 13 December 1965)\n- **Inspect the rudder mass balance** at least every **100 hours of flight time** (\"time in service\")\n- **Keep doing these inspections** until a permanent fix (\"Beagle Modification 440\") is installed\n\n**Who it affects:** Anyone who owns, operates, or maintains a Beagle B206 Series 1 aircraft in Australia.\n\n**Why it matters:** If the rudder mass balance fails or is missing, the rudder can vibrate uncontrollably (flutter), potentially causing loss of control and a crash. This AD ensures the problem is caught early through regular inspections until a permanent solution is applied."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bea-206-1-rudder-mass-balance","history":"/api/acts/ad-bea-206-1-rudder-mass-balance/history","analysis":"/api/acts/ad-bea-206-1-rudder-mass-balance/analysis","conflicts":"/api/acts/ad-bea-206-1-rudder-mass-balance/conflicts","importantCases":"/api/acts/ad-bea-206-1-rudder-mass-balance/important-cases","documents":"/api/acts/ad-bea-206-1-rudder-mass-balance/documents"}}