{"id":"F2006L01348","name":"AD/AL501/2 - 2nd Stage Turbine","slug":"ad-al501-2-2nd-stage-turbine","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":58870,"registerId":"commonwealth-F2006L01348-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Rolls Royce (Allison) Turbine Engines - ","sectionType":"division","heading":"Rolls Royce (Allison) Turbine Engines - AL501 Series","content":"### Rolls Royce (Allison) Turbine Engines - AL501 Series\n\n| AD/AL501/2 | 2nd Stage Turbine | 6/2006 |\n| ---------- | ----------------- | ------ |\n\n| Applicability: | Rolls Royce (formerly DETROIT DIESEL ALLISON) Model 501-D13 series engines which incorporate P/N 6829072 second stage turbine wheels with serial numbers as listed in FAA AD 75-17-32. |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Remove from service second stage turbine wheels P/N 6829072 with serial numbers as listed in FAA AD 75-17-32.Note: FAA AD 75-17-32 Amdt 39-2336 refers.                                |\n| Compliance:    | As detailed in FAA AD 75-17-32 with a revised effective date of 8 June 2006.                                                                                                           |\n|                | This Airworthiness Directive becomes effective on 8 June 2006.                                                                                                                         |\n| Background:    | This AD requires the removal from service of particular P/N second stage turbine wheels that were inspected using a particular fluorescent penetrant inspection process.               |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n28 April 2006","sortOrder":0},{"sectionNumber":"AD/AL501/2","sectionType":"part","heading":"AD/AL501/2","content":"## AD/AL501/2","sortOrder":1},{"sectionNumber":"2nd","sectionType":"part","heading":"Stage Turbine","content":"## 2nd Stage Turbine","sortOrder":2},{"sectionNumber":"6/2006","sectionType":"part","heading":"6/2006","content":"## 6/2006","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, narrow airworthiness directive addressing a specific safety defect in specific engine parts. It has not expanded beyond its original purpose of mandating removal of defective turbine wheels."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 1 defined term implicitly referenced (FAA AD 75-17-32)","Single unconditional requirement with no exceptions or conditional logic","No cross-references to other Australian legislation or regulations","Simple structure: applicability → requirement → compliance → background","Relies entirely on external document (FAA AD) for serial number list and detailed procedures"],"plain_english_summary":"This Airworthiness Directive requires immediate removal from service of specific second‑stage turbine wheels (P/N 6829072, serial numbers per FAA AD 75‑17‑32) in Rolls‑Royce 501‑D13 engines because a faulty fluorescent penetrant inspection may have missed defects. It affects operators and maintenance organisations using or servicing those engines and prevents potentially catastrophic engine failure by ensuring the suspect parts are taken out of service (effective 8 June 2006)."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive does not expand or narrow the set of affected parts beyond the FAA-listed serial numbers; it instructs removal of those specific turbine wheels and adopts a revised effective date of 8 June 2006. Substantive scope remains the same as set out in FAA AD 75-17-32, with this instrument delegating detailed compliance procedures to that FAA AD (Applicability; Requirement; Compliance)."},"complexity_factors":["Cross-reference to FAA AD 75-17-32 for the definitive serial-number list and procedural detail (Applicability; Requirement; Compliance)","Narrow technical applicability: only Model 501-D13 engines with P/N 6829072 and specific serial numbers are affected (Applicability)","Mandatory remedial action (removal from service) creates direct operational and replacement costs for operators (Requirement)","Revised effective date introduces a firm compliance timeline (Compliance)","Limited procedural detail in this instrument — reliance on an external FAA document increases procedural dependence and administrative steps (Compliance; Background)","Technical trigger originates from a particular inspection method (fluorescent penetrant), but the AD does not detail alternative inspection or replacement criteria (Background)"],"plain_english_summary":"This Airworthiness Directive requires operators of Rolls Royce (formerly Detroit Diesel Allison) Model 501-D13 engines to remove from service second-stage turbine wheels P/N 6829072 that match serial numbers listed in FAA AD 75-17-32 (Applicability; Requirement). It takes effect 8 June 2006 and defers technical details to the FAA AD (Compliance). Operators bear the cost and must identify affected serial numbers per the FAA list; the directive responds to concerns about parts inspected using a specific fluorescent penetrant process (Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-al501-2-2nd-stage-turbine","history":"/api/acts/ad-al501-2-2nd-stage-turbine/history","analysis":"/api/acts/ad-al501-2-2nd-stage-turbine/analysis","conflicts":"/api/acts/ad-al501-2-2nd-stage-turbine/conflicts","importantCases":"/api/acts/ad-al501-2-2nd-stage-turbine/important-cases","documents":"/api/acts/ad-al501-2-2nd-stage-turbine/documents"}}