{"id":"F2006B10998","name":"AD/JT8D/8 - Second Stage Fan Blade Pin Rivets","slug":"ad-jt8d-8-second-stage-fan-blade-pin-rivets","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56590,"registerId":"commonwealth-F2006B10998-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JT8D/8 - Second Stage Fan Blade Pin 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/8 Second Stage Fan Blade Pin Rivets 7/76\n\nApplicability: All JT8D-9, -11, -15 and -17 engines containing second stage fan blade pin P/N 520456, rivet P/N 520457 and bushing P/N 520458.\n\n \n\nDocument: 1. FAA AD 76-12-06 : Amendment 39-2639; or\n\n \n\n2. AD/PW-T/36.\n\n \n\nCompliance: As detailed in the Requirement Document.\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\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The AD, as presented, applies only to the specified JT8D-9, -11, -15 and -17 engines that contain the listed part numbers. The instrument does not expand applicability beyond those engines and parts; it instead delegates the required actions to the referenced Requirement Document (FAA AD 76-12-06 or AD/PW-T/36). There is no indication in the text supplied that the scope has been broadened or narrowed from an earlier version."},"complexity_factors":["Reliance on external documents (FAA AD 76-12-06 or AD/PW-T/36) for the substantive steps rather than containing requirements in the AD text.","Technical specificity by part numbers (P/N 520456, 520457, 520458) requires accurate identification of installed components.","Operational complexity: compliance entails maintenance, inspection, parts replacement and aircraft downtime handled by qualified personnel.","Cross-jurisdictional reference (CASA AD referring to an FAA AD) introduces potential for differing document formats and terminologies.","Lack of detailed timing, procedures or enforcement language in the AD itself forces operators to interpret and locate the requirement document."],"plain_english_summary":"Airworthiness Directive AD/JT8D/8 applies to JT8D‑9, ‑11, ‑15 and ‑17 engines fitted with second‑stage fan pin P/N 520456, rivet P/N 520457 and bushing P/N 520458 and requires operators to carry out the actions set out in the referenced Requirement Document (FAA AD 76‑12‑06 or AD/PW‑T/36).  \n\nThis places inspection, repair/replacement, record‑keeping and downtime costs on operators and matters because compliance depends on correctly identifying affected engines and following the external maintenance instructions."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a narrow, technical maintenance directive focused on specific part numbers in specific engine models. It has not expanded beyond its original purpose of addressing a known safety defect in fan blade pin rivets."},"complexity_factors":["Extremely short document (under 200 words)","No defined terms section — relies entirely on external references","Simple conditional logic: if you have these specific engines with these specific part numbers, comply with the referenced document","No nested exceptions or conditional compliance pathways","Single compliance pathway: follow the external requirement document","Technical complexity exists in the referenced FAA AD, not in this instrument itself"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). \n\n**What it does:**\nIt requires specific maintenance or inspection actions on certain Pratt & Whitney JT8D jet engines. These engines power aircraft like the Boeing 727 and early 737 models. The directive targets a particular set of parts: the pin rivets that hold the second-stage fan blades in place.\n\n**Who it affects:**\n- Aircraft operators using JT8D-9, -11, -15, or -17 engines\n- Specifically, engines containing part numbers 520456 (pin), 520457 (rivet), and 520458 (bushing)\n- Maintenance organisations servicing these engines\n\n**Why it matters:**\nFan blade pin rivets are critical safety components. If they fail, fan blades can detach, causing catastrophic engine damage or even bringing down an aircraft. This AD mandates compliance with an American Federal Aviation Administration (FAA) safety directive (AD 76-12-06) or an earlier Australian equivalent (AD/PW-T/36), ensuring these specific parts are inspected or replaced before they fail.\n\n**Key point:** The actual technical requirements aren't spelled out in this document — operators must follow the detailed instructions in the referenced FAA document or the earlier Australian directive."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jt8d-8-second-stage-fan-blade-pin-rivets","history":"/api/acts/ad-jt8d-8-second-stage-fan-blade-pin-rivets/history","analysis":"/api/acts/ad-jt8d-8-second-stage-fan-blade-pin-rivets/analysis","conflicts":"/api/acts/ad-jt8d-8-second-stage-fan-blade-pin-rivets/conflicts","importantCases":"/api/acts/ad-jt8d-8-second-stage-fan-blade-pin-rivets/important-cases","documents":"/api/acts/ad-jt8d-8-second-stage-fan-blade-pin-rivets/documents"}}