{"id":"F2006B04146","name":"AD/BEECH 65/50 Amdt 1 - Wheel Well Fuel Lines","slug":"ad-beech-65-50-amdt-1-wheel-well-fuel-lines","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43875,"registerId":"commonwealth-F2006B04146-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 65/50 Amdt 1 - Wheel Well Fuel Lines","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 65 and 70 (Queen Air) Series Aeroplanes\n\n \n\n# AD/BEECH 65/50\n\nAmdt 1\n\nApplicability: All models 65 and 70.\n\n# Wheel Well Fuel Lines 3/89\n\n \n\nRequirement: Replace all aluminium fuel lines upstream of the fuel selector valve in each main landing gear wheel well with lines fabricated from stainless steel.\n\n \n\nNote: This requirement does not include the large diameter fuel tank interconnect line situated in the aft section of the wheel wells.\n\n \n\nCompliance: Before 1 July 1979.\n\n \n\nBackground: In the event of an uncontained engine compartment fire it is known that flames will be directed by the slipstream into the main landing gear wheel wells, through which unprotected aluminium fuel lines of small diameter are located. Should any line burn through upstream of the fuel selector valve, an uncontrollable amount of fuel will be added to the fire and the integrity of the wing main spar will be endangered. In order to reduce this threat the aluminium fuel lines are to be replaced with those of stainless steel.\n\n \n\nThis amendment consolidates Queen Air 65 and 70 series aircraft. Previous compliance with AD/BEECH 70/21 is equivalent compliance with this AD.\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 amendment performs a simple administrative consolidation — merging two previously separate directives for related aircraft models (65 and 70 series) into one. The substantive safety requirement (replacing aluminium fuel lines with stainless steel) remains identical to the original 1989 directive. No expansion of scope beyond the original fire-safety purpose."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined term implicitly understood ('upstream' — directional term in plumbing)","Single, unambiguous requirement with one clear exception noted","No cross-references to other legislation beyond a simple consolidation note","No conditional logic or nested exceptions","Plain language background explanation included"],"plain_english_summary":"This CASA Airworthiness Directive mandates that operators of Beechcraft 65 and 70 \"Queen Air\" aircraft replace specified small-diameter aluminium fuel lines in the main landing gear wheel wells (upstream of the fuel selector valve) with stainless steel to prevent fuel-fed fires that could destroy the wing spar. Amendment 1 consolidates older model-specific ADs; prior compliance with the earlier Beech 70 AD satisfies this one."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment consolidates coverage for Queen Air 65 and 70 series into a single AD and accepts prior compliance with AD/BEECH 70/21 as equivalent; it does not alter the core technical requirement or expand substantive scope."},"complexity_factors":["Single, well‑specified technical action: replace aluminium lines upstream of the fuel selector valve with stainless steel — low procedural ambiguity.","\"Fabricated from stainless steel\" implies workshop fabrication or part sourcing, creating moderate supply/installation complexity and cost for operators.","Applicability to all Beechcraft 65 and 70 models increases the population affected and aggregate compliance demand on maintenance facilities.","Explicit exclusion of the large‑diameter aft tank interconnect reduces scope but requires accurate identification of lines during inspection.","Fixed compliance deadline (before 1 July 1979) creates scheduling pressure and potential operational downtime; deadline is historic in the text.","Equivalence clause: prior compliance with AD/BEECH 70/21 is accepted, which lowers repeat work and simplifies conformity assessments.","Safety consequence is high (wing spar integrity risk), so regulatory and maintenance documentation/verification burdens are material despite simple technical change."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Beechcraft 65 and 70 (Queen Air) aircraft to replace all small aluminium fuel lines upstream of the fuel selector valve in each main landing‑gear wheel well with stainless‑steel lines (excluding the large‑diameter aft tank interconnect), by 1 July 1979. The stated purpose is to reduce the risk that burning aluminium lines would feed an uncontained engine‑compartment fire and threaten the wing main spar; operators pay for and must schedule the modification."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-65-50-amdt-1-wheel-well-fuel-lines","history":"/api/acts/ad-beech-65-50-amdt-1-wheel-well-fuel-lines/history","analysis":"/api/acts/ad-beech-65-50-amdt-1-wheel-well-fuel-lines/analysis","conflicts":"/api/acts/ad-beech-65-50-amdt-1-wheel-well-fuel-lines/conflicts","importantCases":"/api/acts/ad-beech-65-50-amdt-1-wheel-well-fuel-lines/important-cases","documents":"/api/acts/ad-beech-65-50-amdt-1-wheel-well-fuel-lines/documents"}}