{"id":"F2006B03773","name":"AD/BEECH 300/2 - Wing Fatigue Life Limitation","slug":"ad-beech-300-2-wing-fatigue-life-limitation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43369,"registerId":"commonwealth-F2006B03773-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 300/2 - Wing Fatigue Life Limitation","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBeechcraft 300 Series Aeroplanes\n\nAD/BEECH 300/2 Wing Fatigue Life Limitation 11/91\n\nApplicability: All models.\n\nRequirement: For aircraft serial number FA-2 to FA-190 inclusive:\n\n    (a) Modify the lower forward wing spar attachment fittings by installing Beech Kit No. 101-4050, and\n    (b) Retire from service the wing centre and outer section main spar lower cap assemblies, including the attachment fittings.\n\nNote: FAA AD 91-12-10 and Section 4-00-00 of the Beech 300 Service Maintenance Manual refers.\n\nCompliance: For Requirement paragraph (a):\n\nFor Model 300 LW aeroplanes, prior to exceeding 8300 hours component time in service; and for Model 300 aeroplanes, prior to exceeding 9000 hours component time in service.\n\nFor Requirement paragraph (b):\n\nBefore exceeding 15 000 hours component time in service.\n\nBackground: This AD requires the installation of cold-expanded bushes into the wing attachment lugs, to improve their fatigue characteristics. The unmodified lugs failed well short of the interim 15 000 hour life when fatigue tested. Beech is conducting further tests on the modified lugs with a view to extending the fatigue life beyond 15 000 hours. This requirement is based upon a Country-of-Origin FAA Airworthiness Directive and fatigue tests carried out by the manufacturer.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope. It addresses a specific fatigue life safety issue identified in early-production Beechcraft 300 series aircraft. The document references ongoing manufacturer testing with potential for future life extension, but this represents anticipated evolution rather than scope creep. The directive remains tightly focused on wing spar attachment integrity for the identified serial number range."},"complexity_factors":["Single, specific aircraft type and serial number range (FA-2 to FA-190)","Only two distinct requirements with clear deadlines","Minimal defined terms (only 'component time in service' requires industry knowledge)","No cross-references to other legislation sections beyond a note mentioning FAA AD and maintenance manual","Straightforward conditional logic: 'if serial number X, do Y by Z hours'","Short document (approximately 200 words)"],"plain_english_summary":"This safety rule applies to Beechcraft 300 series aircraft (serials FA-2 through FA-190). It requires installing Beech Kit No. 101-4050 (cold‑expanded bushes in the wing attachment lugs) before 8,300 hours for Model 300 LW or 9,000 hours for standard Model 300, and permanently retiring the main wing spar lower cap assemblies before 15,000 flight hours.\n\nIt affects owners/operators of those older aircraft and prevents premature wing‑attachment cracking; non‑compliance grounds the aircraft from Australian airspace."},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"The AD does not broaden model applicability beyond the stated 'All models' heading; instead it limits mandatory actions to aircraft with serial numbers FA-2 through FA-190 and ties compliance to component hours. In other words, applicability remains broad on its face (Applicability) but the operative requirements apply only to the specified serial-number range and specified component-time thresholds (Requirement; Compliance)."},"complexity_factors":["Targeted serial-number scope within an otherwise 'All models' applicability (Applicability; Requirement: serial FA-2 to FA-190).","Two distinct mandatory actions: installation of a specific kit (Beech Kit No. 101-4050) and retirement of specified spar lower cap assemblies (Requirement (a) and (b)).","Different compliance thresholds by model measured in component time-in-service (Model 300 LW: 8300 hours for kit; Model 300: 9000 hours for kit) and a separate retirement threshold (15,000 hours) (Compliance).","Technical specificity of parts and modification method (cold-expanded bushes referenced in Background; Kit number in Requirement (a)) requiring qualified maintenance work and parts sourcing.","Record-keeping and tracking burden: operators must reliably monitor component hours to meet staged deadlines (Compliance).","Dependence on overseas authority and manufacturer documents for method and justification (Note referencing FAA AD 91-12-10 and Beech Service Maintenance Manual).","Ongoing uncertainty about long-term life extension pending manufacturer testing (Background), which affects future compliance planning and potential rework.","Operational impact concentrated on owners/operators of the specified serial-number range (concentrated compliance cost and logistic impact)."],"plain_english_summary":"**What it does:** Requires owners/operators of Beechcraft 300-series aeroplanes with serial numbers FA-2 through FA-190 to install Beech Kit No. 101-4050 on the lower forward wing spar attachment fittings and to retire the wing centre and outer section main spar lower cap assemblies (including attachment fittings). Compliance is measured in component hours and differs by model. The requirement is intended to improve fatigue life of the wing attachment lugs based on manufacturer fatigue tests and an FAA AD, and therefore creates modification, part-retirement and record-keeping obligations for operators."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-300-2-wing-fatigue-life-limitation","history":"/api/acts/ad-beech-300-2-wing-fatigue-life-limitation/history","analysis":"/api/acts/ad-beech-300-2-wing-fatigue-life-limitation/analysis","conflicts":"/api/acts/ad-beech-300-2-wing-fatigue-life-limitation/conflicts","importantCases":"/api/acts/ad-beech-300-2-wing-fatigue-life-limitation/important-cases","documents":"/api/acts/ad-beech-300-2-wing-fatigue-life-limitation/documents"}}