{"id":"F2006B10982","name":"AD/JT8D/23 Amdt 2 - First Stage Fan Blade Retention Plate","slug":"ad-jt8d-23-amdt-2-first-stage-fan-blade-retention-plate","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56566,"registerId":"commonwealth-F2006B10982-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JT8D/23 Amdt 2 - First Stage Fan Blade Retention Plate","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/23\n\nAmdt 2\n\n\nFirst Stage Fan Blade Retention Plate 8/90\n\n \n\nApplicability: JT8D-9, -11, -15, -17 series engines.\n\n \n\nRequirement: Install a P/N 803996 or 808145 first stage fan blade retention plate.\n\n \n\nNote: FAA AD 89-25-11 refers.\n\n \n\nCompliance: At next access when parts are available, but no later than 31 December 1991.\n\n \n\nBackground: This Directive has been amended to reflect the PWA release of an additional improved fan blade retention plate. Plate P/N 808145 incorporates the improved fan blade retention features of the P/N 803996 plate and incorporates non chamfered counterweight rivet holes as requested by certain JT8D operators. The P/N 803996 plate has chamfered counterweight rivet holes.\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":3,"scope_assessment":{"changed":true,"description":"The amendment adds acceptance of P/N 808145 in addition to the previously-used P/N 803996 while keeping the same JT8D-9, -11, -15, -17 engine applicability and the compliance timing (Background; Requirement; Applicability; Compliance)."},"complexity_factors":["Narrow applicability limited to specific engine models (Applicability).","Mandatory retrofit requiring one of two exact part numbers creates a procurement requirement (Requirement).","Compliance timing is supply-dependent: \"at next access when parts are available\" with a hard deadline (Compliance).","Technical distinction between plates (chamfered vs non‑chamfered counterweight rivet holes) can affect fitment and maintenance practice (Background).","Cross-reference to FAA AD 89-25-11 introduces an external certification/airworthiness influence (Note).","Issued under Civil Aviation Safety Authority airworthiness directive framework, creating regulator-enforced obligation (header)."],"plain_english_summary":"Requires operators of JT8D-9, -11, -15 and -17 engines to install an improved first‑stage fan blade retention plate (P/N 803996 or 808145). Operators must fit one of these plates at the next engine access or by 31 December 1991; operators pay for parts and installation. The amendment recognises P/N 808145 as an alternative to P/N 803996 and notes a related FAA AD (Background; Requirement; Compliance; Note)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is Amendment 2 to an existing directive. The amendment simply adds an alternative approved part number (P/N 808145) to give operators more flexibility, without expanding the scope of affected engines or the fundamental safety requirement. The original purpose — mandating improved fan blade retention plates — remains unchanged."},"complexity_factors":["Extremely short document — only 8 substantive lines of regulatory text","Zero defined terms requiring interpretation","No cross-references to other legislation (only a non-binding note referencing FAA AD 89-25-11)","Simple conditional logic: single applicability test (engine model) and single compliance deadline","No exceptions, exemptions, or nested conditions","Technical content limited to two part numbers and one mechanical component"],"plain_english_summary":"This CASA Airworthiness Directive mandates owners/operators of Pratt & Whitney JT8D‑9, ‑11, ‑15 and ‑17 engines (common on early Boeing 737‑100/200 and DC‑9/MD‑80 types) fit an improved first‑stage fan blade retention plate to reduce risk of blade separation and catastrophic engine damage. Two approved replacement parts (P/N 803996 or 808145) must be installed at the next engine opening, and no later than 31 December 1991."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jt8d-23-amdt-2-first-stage-fan-blade-retention-plate","history":"/api/acts/ad-jt8d-23-amdt-2-first-stage-fan-blade-retention-plate/history","analysis":"/api/acts/ad-jt8d-23-amdt-2-first-stage-fan-blade-retention-plate/analysis","conflicts":"/api/acts/ad-jt8d-23-amdt-2-first-stage-fan-blade-retention-plate/conflicts","importantCases":"/api/acts/ad-jt8d-23-amdt-2-first-stage-fan-blade-retention-plate/important-cases","documents":"/api/acts/ad-jt8d-23-amdt-2-first-stage-fan-blade-retention-plate/documents"}}