{"id":"F2006B11006","name":"AD/JT9D/13 Amdt 3 - Low Pressure Turbine Anti-Rotation Pins","slug":"ad-jt9d-13-amdt-3-low-pressure-turbine-anti-rotation-pins","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56604,"registerId":"commonwealth-F2006B11006-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JT9D/13 Amdt 3 - Low Pressure Turbine Anti-Rotation Pins","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nPratt and Whitney Turbine Engines \\- JT9D Series\n\nAD/JT9D/13\n\nAmdt 3\n\n  \nLow Pressure Turbine Anti-Rotation Pins 5/88\n\nTX\n\nApplicability: JT9D-3A,-7,-7H,-7AH,-7A,-7A(SP),-7F,-7J,-20 engines not fully incorporating PWA SB 5292.\n\nRequirement: 1. Inspect pre-SB 5292, low pressure turbine vane anti-rotation pins in accordance with the requirements of PWA SB 5735, or as agreed by the Secretary.\n\n2. Replace pre-SB 5292, low pressure turbine vane anti-rotation pins in accordance with the requirements of PWA SB 5292 Rev. 4.\n\nCompliance: 1. In accordance with the Requirement document or as agreed by the Secretary.\n\n2. At the next removal of the low pressure turbine shaft from the low pressure turbine case and vane assembly but not later than 31 December 1989.\n\nBackground: This Directive has been amended to include in the applicable engine models, all JT9D models listed in PWA SB 5292 and 5735. The amendment includes the JT9D-3A model previously removed from the Australian Register.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"The original directive has been expanded. Amendment 3 explicitly adds the JT9D-3A engine model back into scope, which had previously been removed from the Australian Register. This represents a broadening of the directive's coverage beyond its original intent."},"complexity_factors":["Short, single-purpose directive with only 2 main requirements","7 specific engine model variants listed in applicability section","2 cross-references to external technical documents (PWA SB 5735 and PWA SB 5292 Rev. 4) that are not reproduced in the text","Conditional compliance deadline ('next removal' OR fixed date of 31 December 1989)","Alternative compliance pathway ('as agreed by the Secretary') creates administrative discretion","Minimal defined terms (relies on industry-standard aviation terminology)"],"plain_english_summary":"This CASA airworthiness directive requires owners/operators of specified Pratt & Whitney JT9D engines (those not upgraded with Service Bulletin 5292) to inspect old-style low‑pressure turbine anti‑rotation pins per SB5735 and replace them with the improved pins per SB5292 Rev 4. Replacements are due at the next LPT shaft removal or by 31 December 1989.\n\nIt prevents catastrophic engine damage and reinstates JT9D‑3A engines into the directive’s scope."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The directive was amended to expand the set of applicable JT9D models to include all models listed in PWA SB 5292 and SB 5735 and to re‑include the JT9D‑3A model previously removed from the Australian Register (Background)."},"complexity_factors":["Narrow technical scope limited to low pressure turbine vane anti‑rotation pins (Applicability; Requirement)","Specific engine-model list requiring cross‑checking with service bulletins (Applicability; Background)","Cross‑reference to two manufacturer service bulletins (PWA SB 5735 and SB 5292 Rev.4) for procedures (Requirement)","Fixed compliance deadline tied to part removal and a calendar date (Compliance)","Regulatory discretion to accept alternate methods as agreed by the Secretary (Requirement; Compliance)"],"plain_english_summary":"This airworthiness directive requires operators of specified Pratt & Whitney JT9D engines that have not incorporated Service Bulletin 5292 to inspect low‑pressure turbine vane anti‑rotation pins per PWA SB 5735 (or a Secretary‑agreed method) and replace those pins per PWA SB 5292 Rev.4. Replacement must occur at the next removal of the low pressure turbine shaft or by 31 December 1989. Operators bear the inspection and replacement costs; the Secretary may approve alternate compliance methods. (Applicability; Requirement; Compliance.)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-jt9d-13-amdt-3-low-pressure-turbine-anti-rotation-pins","history":"/api/acts/ad-jt9d-13-amdt-3-low-pressure-turbine-anti-rotation-pins/history","analysis":"/api/acts/ad-jt9d-13-amdt-3-low-pressure-turbine-anti-rotation-pins/analysis","conflicts":"/api/acts/ad-jt9d-13-amdt-3-low-pressure-turbine-anti-rotation-pins/conflicts","importantCases":"/api/acts/ad-jt9d-13-amdt-3-low-pressure-turbine-anti-rotation-pins/important-cases","documents":"/api/acts/ad-jt9d-13-amdt-3-low-pressure-turbine-anti-rotation-pins/documents"}}