{"id":"F2006B06679","name":"AD/RRT-S/10 - HP2 Turbine Disc Locating Sleeve","slug":"ad-rrt-s-10-hp2-turbine-disc-locating-sleeve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48681,"registerId":"commonwealth-F2006B06679-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/RRT-S/10 - HP2 Turbine Disc Locating Sleeve","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 - Spey Series\n\n \n\nAD/RRT-S/10 HP2 Turbine Disc Locating Sleeve 13/87 DM\n\nApplicability: Spey 506-14, 506-14A, 506-14D, 511-5W, 511-8, 511-14, 511-14W, 512-14DW, 512-14E, 555-15, 555-15H, 555-15N, 555-15P.\n\n \n\nRequirement: Action in accordance with the Requirements of Rolls Royce SB Sp 72-932 Rev 1.\n\n \n\nNote: Reference Documents:\n\n \n\n1. Fokker SB F28/72-6.\n\n\n \n\n2.    Netherlands AD Fokker F28 BLA nr. 87-62. Compliance: In accordance with the Requirement Document.\n\nBackground: This Directive has been issued to require HP turbine stage 2 disc retaining sleeves to be replaced at cycle lives listed in the Requirement document. This requirement follows advice of an uncontained turbine blade release event which resulted from failure of the subject sleeve.\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 standard, narrow safety directive targeting a specific mechanical defect in specific engine models. It has not expanded beyond its original purpose of mandating a parts replacement to prevent catastrophic engine failure."},"complexity_factors":["Very short document (approximately 200 words)","Only 1 substantive requirement: comply with external technical document (Rolls-Royce Service Bulletin)","No defined terms section — relies entirely on external technical references","Simple applicability list (13 engine models)","No conditional logic, exceptions, or nested provisions","Single compliance pathway with no alternatives"],"plain_english_summary":"This Airworthiness Directive requires operators and maintenance organisations to replace the HP2 turbine disc locating sleeve in specified Rolls‑Royce Spey engines after a set number of flight cycles, following Rolls‑Royce Service Bulletin Sp 72‑932 Rev 1. It addresses an earlier sleeve failure that caused an uncontained turbine blade release, preventing hazardous flying debris and reducing risk to aircraft and people."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"No. The directive retains its original safety‑focused scope: it mandates replacement of the HP stage‑2 turbine disc locating sleeve for the listed Spey engine variants according to the cycle lives and procedures in Rolls‑Royce SB Sp 72‑932 Rev 1. It does not broaden applicability beyond the specified engine models or add requirements beyond following the referenced service document."},"complexity_factors":["Relies on an external, specific service bulletin (Rolls‑Royce SB Sp 72‑932 Rev 1) for the operative requirements rather than containing full actions in the AD itself","Applicability limited to a set list of Spey engine variants, requiring accurate fleet identification and record checks","Compliance depends on engine cycle monitoring and scheduling replacements at specified life limits (administrative and logistical burden)","Operational impact includes parts procurement, MRO capacity and aircraft downtime (coordination costs for operators)","Cross‑reference to foreign/airframe documents (Fokker SB, Netherlands AD) requires checking multiple documents for full compliance context","Low regulator discretion in practice: the AD directs action 'in accordance with' the SB, leaving little operational choice to operators"],"plain_english_summary":"This airworthiness directive requires operators of specified Rolls‑Royce Spey engine models to replace the high‑pressure (HP) stage‑2 turbine disc locating/retaining sleeve at the flight‑cycle lives set out in Rolls‑Royce Service Bulletin Sp 72‑932 Rev 1. It affects aircraft owners, operators and maintenance organisations responsible for those engines. The Civil Aviation Safety Authority mandates compliance; operators pay for parts, labour and downtime and must schedule replacements and tracking of cycle lives to meet the required intervals."}},"importantCases":[],"_links":{"self":"/api/acts/ad-rrt-s-10-hp2-turbine-disc-locating-sleeve","history":"/api/acts/ad-rrt-s-10-hp2-turbine-disc-locating-sleeve/history","analysis":"/api/acts/ad-rrt-s-10-hp2-turbine-disc-locating-sleeve/analysis","conflicts":"/api/acts/ad-rrt-s-10-hp2-turbine-disc-locating-sleeve/conflicts","importantCases":"/api/acts/ad-rrt-s-10-hp2-turbine-disc-locating-sleeve/important-cases","documents":"/api/acts/ad-rrt-s-10-hp2-turbine-disc-locating-sleeve/documents"}}