{"id":"F2008L04129","name":"AD/RB211/27 Amdt 3 - LP Compressor Fan Blades","slug":"ad-rb211-27-amdt-3-lp-compressor-fan-blades","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":76054,"registerId":"commonwealth-F2008L04129-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Rolls Royce Turbine Engines - RB211 Seri","sectionType":"division","heading":"Rolls Royce Turbine Engines - RB211 Series","content":"### Rolls Royce Turbine Engines - RB211 Series\n\n| AD/RB211/27 Amdt 3 | LP Compressor Fan Blades | 12/2008 |\n| ------------------ | ------------------------ | ------- |\n\n| Applicability: | Rolls Royce RB211 - 524 G/H series engines as detailed in Rolls Royce Service Bulletin (SB) RB.211-72-C818 Revision 8.                                                                                                                                                                                                                                                                                                                                                       |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Ultrasonically inspect for cracks in the dovetail slots of the fan blades using the procedures detailed in Rolls Royce SB RB.211-72-C818 Revision 8.Later revisions of Rolls Royce SB RB.211-72-C818 (post revision 8) are approved for use in the requirement and compliance sections of this AD provided the compliance intervals for the ultrasonic inspection do not exceed those detailed in Rolls Royce SB RB.211-72-C818 Revision 8.Note: UK CAA AD 007-10-99 refers. |\n| Compliance:    | As detailed in the compliance section of Rolls Royce SB RB.211-72-C818Revision 8.                                                                                                                                                                                                                                                                                                                                                                                            |\n|                | This Amendment becomes effective on 20 November 2008.                                                                                                                                                                                                                                                                                                                                                                                                                        |\n| Background:    | This AD was issued to address loss of fan blades from an engine in-flight due to failure on the dovetail root bedding line. An ultrasonic inspection process is introduced for early detection of crack initiation.This amendment makes reference to Revision 8 of the manufacturers SB.Amendment 2 introduced an in-situ inspection process.Amendment 2 of this AD became effective on 16 May 2002.Amendment 1 of this AD became effective on 7 September 2000.             |\n\n![](image.001.png)  \nCharles Lenarcic  \nDelegate of the Civil Aviation Safety Authority\n\n3 October 2008","sortOrder":0},{"sectionNumber":"AD/RB211/27 Amdt 3","sectionType":"part","heading":"AD/RB211/27 Amdt 3","content":"## AD/RB211/27 Amdt 3","sortOrder":1},{"sectionNumber":"LP Compressor Fan Blades","sectionType":"part","heading":"LP Compressor Fan Blades","content":"## LP Compressor Fan Blades","sortOrder":2},{"sectionNumber":"12/2008","sectionType":"part","heading":"12/2008","content":"## 12/2008","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 3 updates the AD to reference Rolls‑Royce SB RB.211‑72‑C818 Revision 8 as the controlling procedure and allows later SB revisions only if they do not extend the ultrasonic inspection intervals (Requirement). The core objective—detecting cracks to prevent in‑flight blade loss—remains, but the procedural source and permissible updates have been clarified (Background; Requirement)."},"complexity_factors":["Technical inspection requirement: mandatory ultrasonic inspection of dovetail slots (Requirement).","Dependency on manufacturer's service bulletin for procedures and intervals (Requirement; Compliance).","Conditional acceptance of later SB revisions provided inspection intervals are not extended (Requirement).","Narrow applicability limited to RB211‑524 G/H series engines as detailed in the SB (Applicability).","Operational impact on operators and maintenance organisations: inspections, possible removals/repairs, and aircraft downtime (Requirement; Background).","Cross-reference to UK CAA AD (Note/Requirement) increases multi-jurisdictional awareness.","Amendment history and effective date influence implementation timing and record-keeping (Background; Compliance)."],"plain_english_summary":"This airworthiness directive requires ultrasonic inspection of the dovetail slots on LP compressor fan blades for Rolls‑Royce RB211‑524 G/H engines, using the procedures in Rolls‑Royce Service Bulletin RB.211‑72‑C818 Revision 8 (later SB revisions are allowed only if they do not extend the inspection intervals). It affects aircraft operators and maintenance organisations, who must carry out inspections and any remedial work at the SB-specified intervals to detect cracking and reduce the risk of in‑flight fan blade loss."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope of addressing fan blade dovetail cracking in RB211-524 G/H engines. It simply updates the referenced technical document to Revision 8 of the manufacturer's Service Bulletin, which is a routine maintenance of currency rather than an expansion of scope."},"complexity_factors":["Single, specific technical requirement (ultrasonic inspection)","Only one defined applicability criterion (specific engine series)","No nested exceptions or conditional logic — straightforward incorporation of external technical document","Short document (approximately 250 words of substantive content)","Single cross-reference to UK CAA AD for background context only","Clear compliance deadline structure (referenced to external Service Bulletin)"],"plain_english_summary":"This CASA Airworthiness Directive mandates ultrasonic inspection of fan blade dovetail slots on Rolls‑Royce RB211‑524 G/H engines, using Rolls‑Royce Service Bulletin RB.211‑72‑C818 Revision 8 (or later revisions that don’t extend deadlines). It follows an in‑flight fan blade release due to dovetail cracking; the inspections aim to detect cracks before catastrophic failure. It affects operators and maintenance organisations of affected engines and is legally required. This is the third amendment, updating the SB reference."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-rb211-27-amdt-3-lp-compressor-fan-blades","history":"/api/acts/ad-rb211-27-amdt-3-lp-compressor-fan-blades/history","analysis":"/api/acts/ad-rb211-27-amdt-3-lp-compressor-fan-blades/analysis","conflicts":"/api/acts/ad-rb211-27-amdt-3-lp-compressor-fan-blades/conflicts","importantCases":"/api/acts/ad-rb211-27-amdt-3-lp-compressor-fan-blades/important-cases","documents":"/api/acts/ad-rb211-27-amdt-3-lp-compressor-fan-blades/documents"}}