{"id":"F2006B06550","name":"AD/RB211/2 - H.P. Compressor Stage 1 and 2 Disc - Removal","slug":"ad-rb211-2-h-p-compressor-stage-1-and-2-disc-removal","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48268,"registerId":"commonwealth-F2006B06550-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/RB211/2 - H.P. Compressor Stage 1 and 2 Disc - Removal","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/RB211/2 H.P. Compressor Stage 1 and 2 Disc - Removal 1/82\n\nApplicability: RB211-22B-02, 524-02, 524B-02, 524B2-19, 524B2-39, 524B3-02 and 524C2-19\n\nincorporating HP compressor stage 1 and 2 disc assemblies specified in Alert SB RB211-72-A5885, Rev. 2.\n\n \n\nDocument: Rolls Royce RB211 SB RB211-72-A5885, Rev. 2. Compliance:  In accordance with the requirement document.\n\nBackground: Removal of suspect discs is necessary to prevent uncontained failures.\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\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused specifically on removing defective compressor discs from specific engine models. It has not expanded beyond its original technical safety purpose."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 1 defined applicability criterion (specific engine models)","Single compliance requirement (follow the referenced service bulletin)","No nested exceptions or conditional logic","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","Straightforward safety imperative with clear mechanical action required"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires the **removal of specific high-pressure compressor discs** from certain Rolls-Royce RB211 jet engines.\n\n**What it does:**\n- Orders airlines and aircraft operators to remove \"Stage 1 and 2\" disc assemblies from the high-pressure (H.P.) compressor section of specific RB211 engine models\n- These discs are identified in Rolls-Royce Alert Service Bulletin RB211-72-A5885, Revision 2\n\n**Who it affects:**\n- Operators of aircraft using these specific Rolls-Royce RB211 engine variants: RB211-22B-02, 524-02, 524B-02, 524B2-19, 524B2-39, 524B3-02, and 524C2-19\n- This typically includes operators of older Boeing 747s and Lockheed L-1011 Tristars that used these engines\n\n**Why it matters:**\n- **Safety critical:** The directive aims to prevent \"uncontained failures\" — catastrophic engine failures where rotating parts break free and potentially damage the aircraft or injure passengers\n- The \"suspect discs\" mentioned have a defect that could cause the engine to disintegrate in flight\n- Compliance is mandatory under Australian civil aviation law\n\n**How to comply:**\nOperators must follow the instructions in the referenced Rolls-Royce Service Bulletin (SB RB211-72-A5885, Rev. 2) to identify and remove the affected disc assemblies."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive as presented is focused on removing suspect H.P. compressor stage 1 and 2 discs on the listed RB211 engine variants that incorporate the assemblies specified in Rolls-Royce SB RB211-72-A5885, Rev. 2. Its scope aligns with that stated purpose: identification and removal of specified suspect discs to prevent uncontained failures. (See: \"Applicability\", \"Document\", \"Background\", \"Compliance\".)"},"complexity_factors":["Dependence on an external technical document (Rolls-Royce SB RB211-72-A5885, Rev. 2) for detailed procedures and identification of \"suspect\" parts (Document; Compliance).","Need for operators to verify whether their specific engines incorporate the listed disc assemblies (Applicability).","Operational logistics: removal, replacement parts, maintenance labour and scheduling (implied by Compliance and Background).","Limited detail in the directive itself (short, procedural), requiring cross-referencing to the service bulletin for substantive instructions (Document)."],"plain_english_summary":"This airworthiness directive mandates removal of specified high‑pressure compressor stage 1 and 2 disc assemblies from certain Rolls‑Royce RB211 engine types, by requiring compliance with Rolls‑Royce Alert Service Bulletin RB211‑72‑A5885 Rev. 2.  \n\nIt affects operators, owners and maintenance organisations that have those discs installed, is intended to prevent uncontained disc failures, and makes adherence to the service bulletin mandatory (with practical costs and scheduling borne by operators/maintenance providers)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-rb211-2-h-p-compressor-stage-1-and-2-disc-removal","history":"/api/acts/ad-rb211-2-h-p-compressor-stage-1-and-2-disc-removal/history","analysis":"/api/acts/ad-rb211-2-h-p-compressor-stage-1-and-2-disc-removal/analysis","conflicts":"/api/acts/ad-rb211-2-h-p-compressor-stage-1-and-2-disc-removal/conflicts","importantCases":"/api/acts/ad-rb211-2-h-p-compressor-stage-1-and-2-disc-removal/important-cases","documents":"/api/acts/ad-rb211-2-h-p-compressor-stage-1-and-2-disc-removal/documents"}}