{"id":"F2008L00541","name":"AD/LJ45/12 - Airworthiness Limitations","slug":"ad-lj45-12-airworthiness-limitations","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":119443,"registerId":"commonwealth-F2008L00541-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Learjet 45 Series Aeroplanes","sectionType":"division","heading":"Learjet 45 Series Aeroplanes","content":"### Learjet 45 Series Aeroplanes\n\n| AD/LJ45/12 | Airworthiness Limitations | 3/2008 |\n| ---------- | ------------------------- | ------ |\n\n| Applicability: | Model 45 aircraft, serial numbers 45-002 through 45-302, and 45-2001 through45-2049.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2008-01-03 Amdt 39-15328.Note: Learjet 45 Maintenance Manual Chapter 4, Revision 38, dated 24 April 2006, and Learjet 40 Maintenance Manual Chapter 4, Revision 6, dated 24 April 2006, refer.                                                                                                                                                                                                                                                                                                               |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of13 March 2008.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |\n|                | This Airworthiness Directive becomes effective on 13 March 2008.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n| Background:    | This Directive requires revising the Airworthiness Limitations section of the Aircraft Maintenance Manual to incorporate certain inspections and compliance times to detect fatigue cracking of certain Principal Structural Elements (PSEs). The Requirement document of this Directive results from new and more restrictive life limits and inspection intervals for certain PSEs. This Directive is intended to ensure that fatigue cracking of various PSEs is detected and corrected, as such cracking can adversely affect the structural integrity of the aircraft. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n30 January 2008","sortOrder":0},{"sectionNumber":"AD/LJ45/12","sectionType":"part","heading":"AD/LJ45/12","content":"## AD/LJ45/12","sortOrder":1},{"sectionNumber":"Airworthiness Limitations","sectionType":"part","heading":"Airworthiness Limitations","content":"## Airworthiness Limitations","sortOrder":2},{"sectionNumber":"3/2008","sectionType":"part","heading":"3/2008","content":"## 3/2008","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"The Directive tightens scope relative to prior maintenance requirements by imposing new, more restrictive life limits and inspection intervals for certain Principal Structural Elements and by requiring revision of the Airworthiness Limitations section of the Aircraft Maintenance Manual (Background; Requirement)."},"complexity_factors":["Incorporation by reference of FAA AD 2008-01-03 with technical inspection intervals and life limits (Requirement).","Applicability confined to specific serial-number ranges, requiring aircraft-level tracking and record checks (Applicability).","Mandatory amendment of the Aircraft Maintenance Manual Airworthiness Limitations section (Requirement; Note to AMM Chapter 4 revisions).","Scheduling and recordkeeping implications for recurring inspections and life-limited parts (Background; Compliance).","Potential need for technical/engineering judgement to detect and correct fatigue cracking of Principal Structural Elements (Background).","Cross-jurisdictional reliance on an external regulatory document (FAA AD) increases reference complexity (Requirement).","Revised effective date and compliance timing that operators must implement from 13 March 2008 (Compliance).","Enforcement and administrative oversight by the Civil Aviation Safety Authority (signature/issuance)."],"plain_english_summary":"This Airworthiness Directive applies to Learjet 45 series aircraft (serial numbers 45-002–45-302 and 45-2001–45-2049) and requires revising the Aircraft Maintenance Manual Airworthiness Limitations to add inspections and stricter life limits per FAA AD 2008-01-03. It becomes effective 13 March 2008. The directive imposes compliance costs on operators, who must perform additional inspections and meet stricter life limits on certain Principal Structural Elements."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original, narrow scope: mandating specific maintenance manual updates for a defined aircraft type to address a known safety issue. There is no evidence of scope creep; the document precisely targets fatigue cracking in Principal Structural Elements of Learjet 45 series aircraft as originally intended."},"complexity_factors":["Very short document (approximately 200 words of substantive content)","Only 2 defined applicability criteria (aircraft model and serial number ranges)","Single primary requirement with reference to external technical documents","No nested conditional logic or exceptions","Clear, single compliance date","Heavy reliance on incorporated external documents (FAA AD and maintenance manuals) for technical detail, keeping the directive itself brief"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of specified Learjet 45 aircraft (S/N 45‑002–45‑302 and 45‑2001–45‑2049) to revise their maintenance manuals with new inspection intervals and life limits to detect fatigue cracking in principal structural elements. It affects operators, maintenance organisations and CASA enforcement, and aims to prevent structural failure; compliance is required by 13 March 2008."}},"importantCases":[],"_links":{"self":"/api/acts/ad-lj45-12-airworthiness-limitations","history":"/api/acts/ad-lj45-12-airworthiness-limitations/history","analysis":"/api/acts/ad-lj45-12-airworthiness-limitations/analysis","conflicts":"/api/acts/ad-lj45-12-airworthiness-limitations/conflicts","importantCases":"/api/acts/ad-lj45-12-airworthiness-limitations/important-cases","documents":"/api/acts/ad-lj45-12-airworthiness-limitations/documents"}}