{"id":"F2006B10977","name":"AD/JT8D/15 - Third Stage Turbine Rivets","slug":"ad-jt8d-15-third-stage-turbine-rivets","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56559,"registerId":"commonwealth-F2006B10977-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JT8D/15 - Third Stage Turbine Rivets","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)  Pratt and Whitney Turbine Engines - JT8D Series\n\n \n\nAD/JT8D/15 Third Stage Turbine Rivets 2/79\n\nApplicability: JT8D-1, -1A, -1B, -7, -7A, -7B, -9 and -9A engine models not fitted with third stage turbine blade retention rivets drive P/N 759351 or P/N 618749.\n\n \n\nDocument: 1. FAA AD 78-23-12 : Amendment 39-3315; and\n\n \n\n2. PWS SB No. 4592, Rev. 1; or 3. AD/PW-T/50.\n\nCompliance: As detailed in Requirement Document No. 1.\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 addressing a specific mechanical defect in specific engine models. It has not expanded beyond its original purpose of mandating rivet inspection/replacement."},"complexity_factors":["Very short document (approximately 200 words)","Only 2 substantive operative provisions (applicability and compliance)","No defined terms section — relies entirely on external technical references","Simple conditional logic: applies to specific engine models, with single exception for engines already fitted with upgraded parts","Heavy reliance on external documents (FAA AD, Pratt & Whitney Service Bulletin) for actual technical requirements","No nested exceptions or conditional sub-clauses"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft engines.\n\n**What it does:**\nThis directive (AD/JT8D/15) requires specific maintenance action on certain Pratt & Whitney JT8D jet engines. It targets the **third stage turbine** — a section of the engine where hot gases spin turbine blades to generate power. The issue involves **rivets** (metal fasteners) that hold these turbine blades in place.\n\n**Who it affects:**\nOwners and operators of aircraft using JT8D-1, -1A, -1B, -7, -7A, -7B, -9, and -9A engine models **unless** those engines already have specific upgraded rivet parts installed (part numbers 759351 or 618749).\n\n**Why it matters:**\nTurbine blade retention rivets are critical safety components. If they fail, turbine blades can detach at high speed, potentially causing catastrophic engine damage, fire, or loss of aircraft control. This AD mandates compliance with an American Federal Aviation Administration (FAA) safety directive (AD 78-23-12) and Pratt & Whitney service bulletins to prevent such failures.\n\n**What must be done:**\nOperators must follow the detailed instructions in the referenced FAA document to inspect, replace, or modify the rivets as specified."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD applies to the specified JT8D engine models that are not fitted with third stage turbine blade retention rivets having drive P/N 759351 or P/N 618749, and it mandates compliance with the cited FAA AD and Pratt & Whitney service information or alternate AD. The instrument’s scope, as presented in the provided text, is consistent with that stated applicability and the directive’s approach of delegating technical detail to the referenced Requirement Document(s) (see: \"Applicability\", \"Document\", \"Compliance\")."},"complexity_factors":["Narrow technical scope (specific JT8D submodels and specific rivet part numbers) increases clarity but requires technical knowledge of engine configuration (Applicability).","Core requirements are not reproduced in the AD text provided; they are contained in external documents (FAA AD 78-23-12, PWS SB No. 4592 Rev.1, AD/PW-T/50), creating dependency on those documents for full compliance details (Document, Compliance).","Cross‑jurisdictional and multi‑document referencing (FAA AD and manufacturer service bulletin or alternate AD) adds procedural complexity for operators who must reconcile requirements across sources (Document).","Operational complexity arises from maintenance scheduling, parts procurement and potential downtime implied by mandated corrective actions (Compliance, Applicability)."],"plain_english_summary":"This AD requires owners/operators of specified Pratt & Whitney JT8D engine models (unless already fitted with third‑stage turbine rivets P/N 759351 or P/N 618749) to carry out the inspection/repair/modification actions set out in the referenced FAA AD and Pratt & Whitney service bulletin (or alternate AD).  \n\nIt matters because it mandates compliance with external technical instructions for third‑stage turbine rivets, imposing costs, maintenance downtime and procurement obligations on operators while leaving scheduling and shop choices to them."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jt8d-15-third-stage-turbine-rivets","history":"/api/acts/ad-jt8d-15-third-stage-turbine-rivets/history","analysis":"/api/acts/ad-jt8d-15-third-stage-turbine-rivets/analysis","conflicts":"/api/acts/ad-jt8d-15-third-stage-turbine-rivets/conflicts","importantCases":"/api/acts/ad-jt8d-15-third-stage-turbine-rivets/important-cases","documents":"/api/acts/ad-jt8d-15-third-stage-turbine-rivets/documents"}}