{"id":"F2006B11108","name":"AD/LEARJET 35/29 - Retirement Life - Fatigue Critical Components","slug":"ad-learjet-35-29-retirement-life-fatigue-critical-components","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56768,"registerId":"commonwealth-F2006B11108-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/LEARJET 35/29 - Retirement Life - Fatigue Critical Components","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)  Gates Learjet 35 and 36 Series Aeroplanes\n\n \n\n# AD/LEARJET 35/29 Retirement Life - Fatigue Critical Components\n\nApplicability: All Learjet 35 & 36 series aeroplanes.\n\n# 7/95\n\n \n\nRequirement: Retire from service, at or before the times specified therein, all components listed in the Learjet 35 & 36 series Maintenance Manual, Revision 61, Chapter 5, Section\n\n5-11-00.\n\n \n\nCompliance: This Directive is effective 22 June 1995.\n\n \n\nBackground:  This Directive reflects the manufacturer’s mandatory retirement life schedule for fatigue critical components.\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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-purpose safety directive. It has not expanded beyond its original intent of mandating retirement times for fatigue-critical components on specific aircraft models. The scope remains tightly focused on the Learjet 35/36 series and the specific maintenance manual reference."},"complexity_factors":["Very short document (approximately 150 words)","Only 4 operative sections: Applicability, Requirement, Compliance, and Background","No defined terms section — relies entirely on external reference to manufacturer's manual","Single, unambiguous requirement with no exceptions, conditions, or nested logic","No cross-references to other legislation or regulations beyond the generic 'Civil Aviation Regulations 1998, Part 39' header","External incorporation by reference to a specific manual revision (Revision 61), which creates some complexity but is standard aviation practice"],"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 specific aircraft.\n\n**What it does:** It requires owners and operators of **Learjet 35 and 36 series aircraft** to permanently remove from service (\"retire\") certain aircraft parts before they reach a specific age or usage limit. These parts are listed in the manufacturer's maintenance manual (Chapter 5, Section 5-11-00 of Revision 61).\n\n**Why these parts matter:** The directive targets \"fatigue critical components\" — parts that are prone to metal fatigue (wear and tear from repeated stress during flights). If these parts aren't replaced on time, they could crack or fail, potentially causing catastrophic accidents.\n\n**Who must comply:** Anyone operating a Learjet 35 or 36 in Australia. The rule took effect on **22 June 1995**.\n\n**Why it matters:** This isn't optional. Airworthiness Directives are legally binding safety requirements. Ignoring this could mean flying with parts that are statistically likely to fail, putting passengers, crew, and people on the ground at risk. It also reflects the aircraft manufacturer's own mandatory retirement schedule, meaning CASA is enforcing the maker's safety limits as Australian law."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive implements the manufacturer’s mandatory retirement-life schedule by requiring retirement of the components listed in the referenced maintenance manual. It does not expand or narrow applicability beyond \"All Learjet 35 & 36 series aeroplanes\" and does not add exceptions or alternative compliance routes in the text provided. The Directive therefore aligns with the stated original intent to enforce the manufacturer’s retirement schedule (Applicability; Requirement; Background)."},"complexity_factors":["Relies on an external, technical source for the detailed requirements: Learjet 35 & 36 Maintenance Manual, Revision 61, Chapter 5, Section 5-11-00 (Requirement) — operators must obtain and interpret that document.","Applies to an entire fleet type (all Learjet 35 & 36 series aeroplanes), increasing administrative reach though not technical variety (Applicability).","Operational implementation requires accurate service-life tracking, parts replacement logistics and scheduling, creating practical complexity for operators (Requirement).","The Directive is short and prescriptive on the action (retire parts by specified times) but silent on enforcement, allowed replacement procedures, and record formats — these gaps require operators and regulators to coordinate outside the text (Compliance; Requirement).","Technical complexity is concentrated in the maintenance manual referenced rather than in the Directive itself; interpreting fatigue-critical part lists and retirement criteria demands engineering/maintenance expertise (Requirement; Background)."],"plain_english_summary":"This Directive requires owners/operators of all Learjet 35 and 36 aeroplanes to retire every component listed as fatigue‑critical in the Learjet 35 & 36 Maintenance Manual (Rev.61, Ch.5, §5‑11‑00) at or before the retirement times shown. Effective 22 June 1995, it enforces the manufacturer’s mandatory retirement schedule to manage fatigue risk, shifting replacement costs, recordkeeping, and maintenance planning onto operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-learjet-35-29-retirement-life-fatigue-critical-components","history":"/api/acts/ad-learjet-35-29-retirement-life-fatigue-critical-components/history","analysis":"/api/acts/ad-learjet-35-29-retirement-life-fatigue-critical-components/analysis","conflicts":"/api/acts/ad-learjet-35-29-retirement-life-fatigue-critical-components/conflicts","importantCases":"/api/acts/ad-learjet-35-29-retirement-life-fatigue-critical-components/important-cases","documents":"/api/acts/ad-learjet-35-29-retirement-life-fatigue-critical-components/documents"}}