{"id":"F2006B03951","name":"AD/BEECH 50/27 - Goodyear Fuel Cells","slug":"ad-beech-50-27-goodyear-fuel-cells","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43560,"registerId":"commonwealth-F2006B03951-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 50/27 - Goodyear Fuel Cells","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)  Beechcraft 50 (Twin Bonanza) Series Aeroplanes\n\n \n\nAD/BEECH 50/27 Goodyear Fuel Cells 6/78\n\nApplicability: Models: D50E with S/Nos. DH-334 to DH-347; J50 with S/Nos JH-171 to JH-176; fitted with Goodyear BTC-39 fuel cells.\n\n \n\nRequirement: Action in accordance with Beechcraft SI No. 0895.\n\n \n\nCompliance: Within 100 hours’ time in service after 30 June 1978 and thereafter at intervals not exceeding twelve months.\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, targeted safety directive from 1978 addressing a specific known defect in specific aircraft. It has not expanded beyond its original narrow purpose of ensuring Goodyear BTC-39 fuel cell integrity in affected Beechcraft 50 series aircraft."},"complexity_factors":["Extremely short document — only 4 substantive lines of requirements","No defined terms section; all terms are either common aviation knowledge or reference external documents","Single, unambiguous compliance action (follow Beechcraft SI No. 0895)","Simple applicability test based on model, serial number, and equipment type","Clear, fixed compliance deadline with straightforward recurring interval (12 months)","No cross-references to other legislation, regulations, or conditional exceptions"],"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). Think of it like a compulsory recall notice, but for aircraft instead of cars.\n\n**What it does:** It requires owners and operators of specific Beechcraft 50 series aeroplanes (the \"Twin Bonanza\") to inspect or replace their **Goodyear BTC-39 fuel cells** (the rubber bladders inside the fuel tanks that hold aviation fuel). The work must follow Beechcraft's own Service Instruction No. 0895.\n\n**Who it affects:** Only specific aircraft:\n- **Beechcraft D50E** models with serial numbers DH-334 through DH-347\n- **Beechcraft J50** models with serial numbers JH-171 through JH-176\n- **Only if** they have Goodyear BTC-39 fuel cells installed\n\n**When to comply:**\n- **First check:** Within 100 hours of flying time after 30 June 1978\n- **Ongoing:** Every 12 months after that\n\n**Why it matters:** Fuel cells can degrade, leak, or fail over time. A leaking fuel cell in an aircraft is a serious fire and explosion risk. This directive ensures these specific fuel cells are checked regularly to keep the aircraft safe to fly."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive's scope, as written, applies only to the listed Beechcraft D50E and J50 serial numbers when fitted with Goodyear BTC-39 fuel cells and requires the actions specified in Beechcraft SI No. 0895 on the timetable stated. The text contains no indication that the applicability, required action, or compliance timing has been altered from the instrument as presented. (See \"Applicability\", \"Requirement\", \"Compliance\".)"},"complexity_factors":["Narrow, serial-number-based applicability (specific S/N ranges and model designations) increases administrative tracking complexity (\"Applicability\").","Mandatory reference to an external document (Beechcraft SI No. 0895) requires operators to obtain and follow another source for procedural detail (\"Requirement\").","Recurring compliance interval (initial action within 100 hours after a historical date, then at intervals not exceeding 12 months) creates ongoing scheduling and record-keeping obligations (\"Compliance\").","Vintage timing reference (deadline tied to 30 June 1978) may complicate interpretation for historical records and remaining-in-service aircraft (\"Compliance\")."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of specific Beechcraft 50-series aeroplanes fitted with Goodyear BTC‑39 fuel cells to carry out the work specified in Beechcraft Service Instruction No. 0895. The work must be done within 100 flight hours after 30 June 1978 and repeated at intervals not exceeding 12 months. Owners/operators bear the cost and must obtain and follow the manufacturer’s service instruction to remain compliant."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-50-27-goodyear-fuel-cells","history":"/api/acts/ad-beech-50-27-goodyear-fuel-cells/history","analysis":"/api/acts/ad-beech-50-27-goodyear-fuel-cells/analysis","conflicts":"/api/acts/ad-beech-50-27-goodyear-fuel-cells/conflicts","importantCases":"/api/acts/ad-beech-50-27-goodyear-fuel-cells/important-cases","documents":"/api/acts/ad-beech-50-27-goodyear-fuel-cells/documents"}}