{"id":"F2007L01593","name":"AD/LJ45/10 - APU Fuel Shutoff Valve","slug":"ad-lj45-10-apu-fuel-shutoff-valve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":66154,"registerId":"commonwealth-F2007L01593-current","compilationNumber":null,"startDate":"2026-04-02","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/LJ45/10 | APU Fuel Shutoff Valve | 7/2007 |\n| ---------- | ---------------------- | ------ |\n\n| Applicability: | Learjet Model 45 aeroplanes, serial numbers 45-005 through 45-321, equipped with an auxiliary power unit (APU).                                                                                                                                                                                                                                                                                                  |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Deactivate the APU, cap/plug the fuel lines to the APU, and remove the APU fuel shutoff valve, in accordance with the Accomplishment Instructions of Bombardier Alert Service Bulletin A45-49-11, dated 26 March 2007.Note: FAA AD 2007-09-03 Amdt 39-15033 dated 16 April 2007 refers.                                                                                                                          |\n| Compliance:    | Within 50 flight hours after the effective date of this AD, unless previously accomplished.                                                                                                                                                                                                                                                                                                                      |\n|                | This Airworthiness Directive becomes effective on 5 July 2007.                                                                                                                                                                                                                                                                                                                                                   |\n| Background:    | This AD results from reports of fuel leaking from the APU fuel shutoff valve into a flammable fluid fire protection area that is also interconnected with the main landing gear's wheel well bay. The issuing of this AD is to prevent fuel leaking from the fuel shutoff valve of the APU, which could result in an uncontrollable fire and adversely affect the aeroplane's continued safe flight and landing. |\n\n![](image.001.png)  \nCharles Lenarcic  \nDelegate of the Civil Aviation Safety Authority\n\n2 May 2007","sortOrder":0},{"sectionNumber":"AD/LJ45/10","sectionType":"part","heading":"AD/LJ45/10","content":"## AD/LJ45/10","sortOrder":1},{"sectionNumber":"APU Fuel Shutoff Valve","sectionType":"part","heading":"APU Fuel Shutoff Valve","content":"## APU Fuel Shutoff Valve","sortOrder":2},{"sectionNumber":"7/2007","sectionType":"part","heading":"7/2007","content":"## 7/2007","sortOrder":3}],"analysis":{"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, targeted Airworthiness Directive addressing a specific mechanical defect in a specific aircraft type. The scope remains precisely limited to the identified safety risk (APU fuel shutoff valve leakage) and the specified aircraft population. There is no evidence of scope creep or expansion beyond the original safety purpose."},"complexity_factors":["Very short document (approximately 250 words)","Only 1 defined term implicitly used (APU — explained in context)","Single, unambiguous compliance requirement with clear reference to external technical document (Bombardier Service Bulletin)","No nested exceptions or conditional logic — only one exemption ('unless previously accomplished')","No cross-references to other legislation beyond a note about the related FAA AD","Straightforward applicability criteria (specific aircraft serial number range plus equipment requirement)"],"plain_english_summary":"This CASA Airworthiness Directive applies to certain Learjet 45s (S/N 45‑005–45‑321) with an APU: a leaking APU fuel‑shutoff valve can dump fuel into the main‑gear bay and create an uncontrollable fire risk. Operators must follow Bombardier’s 26 Mar 2007 Alert Service Bulletin to deactivate the APU, cap fuel lines and remove the shutoff valve within 50 flight hours of 5 July 2007. It affects owners, maintainers and flight crew."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD's scope is confined to Learjet 45 aeroplanes serials 45-005 through 45-321 that are fitted with an APU and prescribes removal of the APU fuel shutoff valve to address reported fuel leaks. The text does not expand applicability or prescribe additional measures beyond the specified population and the single corrective action described (Applicability; Requirement; Background)."},"complexity_factors":["Narrow applicability: specific serial-number range (Learjet Model 45, serials 45-005 through 45-321) and only aircraft equipped with an APU (Applicability).","Prescriptive technical remedy: deactivate APU, cap/plug fuel lines, and remove the APU fuel shutoff valve — must follow Bombardier Alert Service Bulletin A45-49-11 (Requirement).","Fixed short compliance window: mandatory action within 50 flight hours after the AD's effective date, 5 July 2007 (Compliance).","Operational and cost impact rests with operators/owners: removing the APU and modifying fuel lines changes aircraft capability and incurs maintenance expense (Requirement, Applicability).","Dependency on an external document: compliance requires following the Bombardier service bulletin dated 26 March 2007 (Requirement).","Regulatory alignment: AD notes and cross-references FAA AD 2007-09-03, indicating parallel foreign regulatory action (Requirement/Note).","Low administrative discretion: directive is mandatory with an effective date and was issued by CASA (Delegate signature and dates).","Safety rationale tied to a specific failure mode: reports of fuel leaking from the APU shutoff valve into a fire-protection area connected to the main landing gear wheel well (Background)."],"plain_english_summary":"This Airworthiness Directive orders owners/operators of Learjet Model 45 aeroplanes (serials 45-005 to 45-321) fitted with an APU to deactivate the APU, cap/plug its fuel lines and remove the APU fuel shutoff valve under Bombardier Alert Service Bulletin A45-49-11. It must be done within 50 flight hours of the AD becoming effective (5 July 2007). CASA says the measure prevents APU fuel leaking into a flammable area that could cause an uncontrollable fire."}},"importantCases":[],"_links":{"self":"/api/acts/ad-lj45-10-apu-fuel-shutoff-valve","history":"/api/acts/ad-lj45-10-apu-fuel-shutoff-valve/history","analysis":"/api/acts/ad-lj45-10-apu-fuel-shutoff-valve/analysis","conflicts":"/api/acts/ad-lj45-10-apu-fuel-shutoff-valve/conflicts","importantCases":"/api/acts/ad-lj45-10-apu-fuel-shutoff-valve/important-cases","documents":"/api/acts/ad-lj45-10-apu-fuel-shutoff-valve/documents"}}