{"id":"F2006B06541","name":"AD/RB211/10 Amdt 1 - High Pressure Compressor Disc","slug":"ad-rb211-10-amdt-1-high-pressure-compressor-disc","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48230,"registerId":"commonwealth-F2006B06541-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/RB211/10 Amdt 1 - High Pressure Compressor Disc","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/RB211/10\n\nAmdt 1\n\n\nHigh Pressure Compressor Disc 9/87\n\n \n\nApplicability: RB211-524 Series Engines.\n\n \n\nRequirement:  Remove from service, stage 1 and stage 2 high pressure compressor disc assemblies identified by serial number in Rolls Royce Service Bulletin RB211-72-A7774 Rev 2 Appendix 3 and Appendix 4.\n\n \n\nNote: FAA AD 86-15-01 Amdt 39-5346 refers.\n\n \n\nCompliance: In accordance with Requirement Document.\n\n \n\nBackground: This Directive has been amended to reflect the manufacturers latest revision to Service Bulletin RB211-72-A7774. The revision, in part, increases the number of discs in Appendix 3 and Appendix 4.\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 amendment stays within the original scope of the 1987 directive. It merely updates the list of affected parts based on new manufacturer data. The fundamental purpose — removing suspect high-pressure compressor discs — remains unchanged since the original AD/RB211/10 was issued."},"complexity_factors":["Very short document — approximately 150 words of substantive content","Only one operative requirement: remove specific parts by serial number","Single cross-reference to an external technical document (Rolls-Royce Service Bulletin)","No defined terms section, no conditional logic, no exceptions","Structure follows standard CASA AD template (Applicability/Requirement/Note/Compliance/Background)","Amendment 1 simply expands the list of affected serial numbers — no structural changes to the regulatory scheme"],"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). Think of it as a \"recall notice\" for aircraft parts, but with legal force.\n\n**What it does:** It orders airlines and aircraft operators to remove specific high-pressure compressor discs from Rolls-Royce RB211-524 jet engines. These are critical rotating parts inside the engine that compress air before combustion. The directive targets Stage 1 and Stage 2 discs with specific serial numbers listed in a Rolls-Royce service bulletin.\n\n**Who it affects:** Anyone operating aircraft with RB211-524 series engines — typically used on older wide-body jets like the Boeing 747-200/300 and Lockheed L-1011 Tristar. This includes airlines, maintenance organisations, and private operators.\n\n**Why it matters:** Compressor discs spin at extreme speeds and temperatures. If one fails, it can destroy the engine and potentially damage the aircraft. This AD responds to updated manufacturer data identifying additional at-risk parts, expanding a previous safety order to catch more potentially defective components before they cause an accident.\n\n**Key point:** The directive doesn't stand alone — operators must follow the detailed instructions in Rolls-Royce Service Bulletin RB211-72-A7774 Revision 2, specifically its Appendices 3 and 4, to identify which exact discs must come out."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The directive was amended to reflect the manufacturer's latest revision of Service Bulletin RB211-72-A7774; the revision \"in part, increases the number of discs in Appendix 3 and Appendix 4.\" This expands the set of serial-numbered stage 1 and stage 2 high pressure compressor disc assemblies that must be removed from service, thereby increasing the number of affected engines/operators. (Background; Requirement; Applicability)"},"complexity_factors":["Relies on an external Requirement Document (Rolls Royce Service Bulletin RB211-72-A7774 Rev 2) for the procedural detail and timing (Requirement; Compliance).","Compliance requires serial-number matching against Appendices 3 and 4, which creates administrative and maintenance workload (Requirement).","Amendment expanded the list of affected discs, increasing scope and operational impact (Background).","The AD cross-references a foreign regulator's AD (FAA AD), introducing interjurisdictional alignment but no procedural detail in this text (Note).","The AD text omits deadlines, penalties, and explicit enforcement mechanisms, leaving those matters to the Requirement Document or other regulatory processes (Compliance)."],"plain_english_summary":"This AD makes mandatory the removal from service of certain stage‑1 and stage‑2 high‑pressure compressor discs in RB211‑524 engines if their serial numbers appear in Rolls‑Royce Service Bulletin RB211‑72‑A7774 Rev 2 (Appendices 3 & 4). The amendment expands the list of affected discs. Operators must follow the Service Bulletin’s procedures to comply; the AD leaves timing, detailed remedies, enforcement and any costs or compensation to the requirement document or other instruments."}},"importantCases":[],"_links":{"self":"/api/acts/ad-rb211-10-amdt-1-high-pressure-compressor-disc","history":"/api/acts/ad-rb211-10-amdt-1-high-pressure-compressor-disc/history","analysis":"/api/acts/ad-rb211-10-amdt-1-high-pressure-compressor-disc/analysis","conflicts":"/api/acts/ad-rb211-10-amdt-1-high-pressure-compressor-disc/conflicts","importantCases":"/api/acts/ad-rb211-10-amdt-1-high-pressure-compressor-disc/important-cases","documents":"/api/acts/ad-rb211-10-amdt-1-high-pressure-compressor-disc/documents"}}