{"id":"F2006B06565","name":"AD/RB211/5 Amdt 2 - Low Pressure Compressor Rotor (Fan) Axial Retention","slug":"ad-rb211-5-amdt-2-low-pressure-compressor-rotor-fan-axial-retention","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48321,"registerId":"commonwealth-F2006B06565-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/RB211/5 Amdt 2 - Low Pressure Compressor Rotor (Fan) Axial Retention","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 - 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Rolls Royce Turbine Engines - RB211 Series\n\n \n\nAD/RB211/5\n\nAmdt 2\n\n\nLow Pressure Compressor Rotor (Fan) Axial Retention\n\n\n1/83\n\n \n\nApplicability: RB211-22B-02, RB211-524B-02, RB211-524B2-19, RB211-524B2-39, RB211-\n\n524C2-19 engines and modules as specified in SB No. RB211-72-6574, Rev. 6.\n\n \n\nDocument: Rolls Royce SB No. RB211-72-6574, Rev. 6.\n\n \n\nNote: FAA AD No. 82-12-05, Amdt. 39-4398 refers.\n\n \n\nCompliance: In accordance with the requirement document.\n\n \n\nBackground:  This Directive is amended in order to reference the latest revision to the manufacturer’s requirement document.\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":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The amendment updates the AD to reference the latest revision of the manufacturer’s service bulletin (Rolls Royce SB No. RB211-72-6574, Rev. 6). The AD’s applicability and the compliance instruction (to follow the requirement document) remain the same in the text provided, so the AD’s scope of affected engines and the mechanism of requiring compliance has not changed in this amendment (see: \"Applicability\", \"Document\", \"Compliance\", \"Background\")."},"complexity_factors":["Narrow technical applicability limited to specific RB211 engine models and modules (Applicability).","Delegation of technical detail to an external manufacturer document (Rolls Royce SB No. RB211-72-6574, Rev. 6) which must be obtained and followed (Document; Compliance).","AD text updates only the reference to the latest SB revision; substantive requirements are not restated in the AD itself (Background).","Cross-reference to another regulator's AD (FAA AD No. 82-12-05) creates a secondary source to consult for context but does not alter CASA’s compliance requirement (Note)."],"plain_english_summary":"This AD amends RB211/5 to reference Rolls‑Royce Service Bulletin RB211‑72‑6574, Revision 6. It affects operators, owners and maintenance organisations for specified RB211‑22B and RB211‑524 engines and modules and requires them to carry out the inspections/modifications and timing set out in that SB.\n\nCASA issues the AD; Rolls‑Royce supplies the technical requirements. Direct costs (labour, parts, downtime) fall to operators, and compliance depends on obtaining and implementing SB Rev. 6."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a routine amendment to an existing Airworthiness Directive. The scope remains exactly as originally intended: ensuring axial retention of the low pressure compressor rotor in specific RB211 engines. The amendment merely updates the referenced technical document to its latest revision (Rev. 6), which is standard maintenance of aviation safety directives. No expansion of scope has occurred."},"complexity_factors":["Extremely short document (approximately 200 words)","Only 1 defined term implicitly referenced (the service bulletin)","No nested conditional logic or exceptions","Single compliance requirement: 'In accordance with the requirement document'","No cross-references to other legislation beyond a note about a related FAA directive","Straightforward applicability list (5 specific engine models)","Amendment nature means it builds on existing understood framework rather than creating new complex structures"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific maintenance or inspection actions on aircraft engines.\n\n**What it does:** This directive orders owners and operators of certain Rolls-Royce RB211 jet engines to follow a specific technical procedure to ensure the \"Low Pressure Compressor Rotor\" (the large front fan of the engine) stays properly secured along its axis (doesn't slide forward or backward unexpectedly).\n\n**Who it affects:** Anyone operating or maintaining these specific Rolls-Royce engine models:\n- RB211-22B-02\n- RB211-524B-02\n- RB211-524B2-19\n- RB211-524B2-39\n- RB211-524C2-19\n\n**What must be done:** Operators must follow the instructions in Rolls-Royce Service Bulletin RB211-72-6574, Revision 6. This is a manufacturer-issued technical document that details exactly how to inspect, repair, or modify the fan retention system.\n\n**Why it matters:** If the fan isn't properly retained axially (held in place along its length), it could shift during flight, potentially causing catastrophic engine failure. This amendment simply updates the directive to reference the latest version of the manufacturer's instructions (Revision 6 of the service bulletin), ensuring operators are following the most current safety procedures.\n\n**Key point:** This is Amendment 2 — meaning it's an update to an existing directive, not a brand new requirement. The only change is updating the reference document to the latest revision."}},"importantCases":[],"_links":{"self":"/api/acts/ad-rb211-5-amdt-2-low-pressure-compressor-rotor-fan-axial-retention","history":"/api/acts/ad-rb211-5-amdt-2-low-pressure-compressor-rotor-fan-axial-retention/history","analysis":"/api/acts/ad-rb211-5-amdt-2-low-pressure-compressor-rotor-fan-axial-retention/analysis","conflicts":"/api/acts/ad-rb211-5-amdt-2-low-pressure-compressor-rotor-fan-axial-retention/conflicts","importantCases":"/api/acts/ad-rb211-5-amdt-2-low-pressure-compressor-rotor-fan-axial-retention/important-cases","documents":"/api/acts/ad-rb211-5-amdt-2-low-pressure-compressor-rotor-fan-axial-retention/documents"}}