{"id":"F2006B03609","name":"AD/BEA 206/6 - Exhaust Bellows - Retirement Life","slug":"ad-bea-206-6-exhaust-bellows-retirement-life","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43200,"registerId":"commonwealth-F2006B03609-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEA 206/6 - Exhaust Bellows - Retirement Life","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 206/6 Exhaust Bellows - Retirement Life 9/69\n\nApplicability: Model B206 Series 2.\n\nRequirement: Retire from service exhaust bellows P/N CE20901 and P/N CE20806. Compliance:  1. For exhaust bellows with more than 500 hours total time in service as at 29\n\nSeptember 1969:\n\n \n\nWithin the next 100 hours time in service after 29 September 1969.\n\n \n\n2. For exhaust bellows with less than 500 hours time in service:\n\n \n\nBefore 600 hours time in service and thereafter at intervals not exceeding 600 hours time in service.\n\n \n\nNote: Beagle B206, Series 2, Maintenance Schedule, Volume 5, page 40-8, dated 30 April 1967 also refers.\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 vintage 1969 Airworthiness Directive that remains in its original narrow scope. It addresses a specific safety-of-flight issue (exhaust bellows fatigue) for a single aircraft type with clear, limited applicability. There is no evidence of scope creep — the directive has not expanded to cover additional aircraft models, parts, or operational scenarios beyond its original intent."},"complexity_factors":["Single, specific aircraft model and series (Beagle B206 Series 2 only)","Only two part numbers affected (P/N CE20901 and P/N CE20806)","Simple binary compliance structure based on hours threshold (500 hours) at a fixed date (29 September 1969)","No defined terms section, no cross-references to other legislation beyond a maintenance manual note","Straightforward time-in-service calculation with no conditional exceptions or nested logic","Total length is approximately 150 words of substantive content"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for a specific type of aircraft.\n\n**Who it affects:** Owners and operators of **Beagle B206 Series 2 aeroplanes** (a British-made light aircraft from the 1960s).\n\n**What it requires:** The directive orders the **replacement (retirement) of specific exhaust bellows parts** — flexible joints in the aircraft's exhaust system. Two part numbers are targeted: **P/N CE20901** and **P/N CE20806**.\n\n**The safety issue:** Exhaust bellows wear out over time. If they fail in flight, it could lead to exhaust leaks, carbon monoxide entering the cabin, or engine damage. This AD sets strict time limits to prevent failures.\n\n**The deadlines:**\n- **High-time parts** (already flown more than 500 hours by 29 September 1969): Replace within the next 100 hours of flying time after that date.\n- **Lower-time parts** (under 500 hours by that date): Replace before reaching 600 total hours, then replace again every 600 hours thereafter.\n\n**Why it matters:** This is a **life-limit rule** — it doesn't wait for parts to break. It mandates replacement based on accumulated flight hours to prevent catastrophic failure. Non-compliance means the aircraft cannot legally fly in Australian airspace."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive itself prescribes retirement life and replacement intervals for two exhaust bellows on Beagle B206 Series 2 aircraft and cites the existing Beagle maintenance schedule (Volume 5, dated 30 April 1967). The text does not state that it expands or narrows an earlier legal scope; based on the instrument alone it sets enforceable hours-based retirement requirements but does not indicate a change in applicability compared with the referenced maintenance material. [\"Compliance\"; \"Note\"]"},"complexity_factors":["Narrow applicability — single aircraft model (Beagle B206 Series 2) and two specific part numbers (CE20901, CE20806) [\"Applicability\"; \"Requirement\"]","Time-based compliance thresholds (500 hours status as at a cutoff date; within 100 hours after that date; before 600 hours and thereafter every 600 hours) which require accurate hours-in-service records [\"Compliance\"]","A retrospective compliance trigger tied to a historical date (29 September 1969) requiring different initial actions depending on hours accrued by that date [\"Compliance\"]","Cross-reference to an existing maintenance schedule (Volume 5, dated 30 April 1967) which may affect how operators integrate the AD into routines [\"Note\"]","Mandatory nature with limited stated discretion in the text — enforcement and any exemptions sit with the issuing authority (regulatory header)"],"plain_english_summary":"This airworthiness directive from the Civil Aviation Safety Authority targets Beagle B206 Series 2 aeroplanes and requires mandatory retirement and replacement of two exhaust bellows (parts CE20901 and CE20806) on a time-in-service schedule. Operators must track bellows hours, retire items at the specified thresholds and follow the referenced maintenance schedule. Costs for parts, labour and downtime fall to aircraft owners/operators; the rule creates predictable recurring maintenance demand."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bea-206-6-exhaust-bellows-retirement-life","history":"/api/acts/ad-bea-206-6-exhaust-bellows-retirement-life/history","analysis":"/api/acts/ad-bea-206-6-exhaust-bellows-retirement-life/analysis","conflicts":"/api/acts/ad-bea-206-6-exhaust-bellows-retirement-life/conflicts","importantCases":"/api/acts/ad-bea-206-6-exhaust-bellows-retirement-life/important-cases","documents":"/api/acts/ad-bea-206-6-exhaust-bellows-retirement-life/documents"}}