{"id":"F2006B11035","name":"AD/JT9D/6 - Engine Tailpipe/Exhaust Case - Inspection for Oil Leakage","slug":"ad-jt9d-6-engine-tailpipe-exhaust-case-inspection-for-oil-leakage","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56647,"registerId":"commonwealth-F2006B11035-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JT9D/6 - Engine Tailpipe/Exhaust Case - Inspection for Oil Leakage","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 - JT9D Series\n\n \n\nAD/JT9D/6 Engine Tailpipe/Exhaust Case - Inspection\n\nfor Oil Leakage\n\n\n6/76\n\n \n\nApplicability: All JT9D engines containing turbine exhaust cases P/Nos. 701877, 728301 through 728309, 731370 through 731373, 731377, 731565, 738438, 739431, 746128, 746272\n\nthrough 746274, 749510, 752872 through 752876, 754763, 756838 and 761943.\n\n \n\nDocument: 1. FAA AD 76-12-03 Pratt & Whitney : Amendment 39-2634; or 2. AD/PW-T/35.\n\nCompliance: In accordance with 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","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-purpose airworthiness directive focused on one specific safety inspection for one engine type. It has not expanded beyond its original scope of ensuring exhaust case integrity on JT9D engines. The document appears complete and unamended in its current form."},"complexity_factors":["Very short document (approximately 200 words)","Only 3 substantive sections: Applicability, Document reference, and Compliance","No defined terms section — relies entirely on external documents for technical requirements","Simple conditional logic: if your engine has these part numbers, you must comply","No nested exceptions or conditional compliance pathways","Cross-references only to two external documents (FAA AD and another Australian AD) rather than complex legislative interdependencies"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA) that mandates safety inspections for a specific type of aircraft engine.\n\n**What it does:**\n- Requires operators to inspect the tailpipe/exhaust case of Pratt & Whitney JT9D series turbine engines for oil leakage\n- Applies only to engines containing specific part numbers (turbine exhaust cases with particular serial numbers listed in the \"Applicability\" section)\n\n**Who it affects:**\n- Airlines and aircraft operators using Pratt & Whitney JT9D engines with the specified exhaust case part numbers\n- Maintenance engineers responsible for engine inspections\n- This engine type was commonly used on Boeing 747, 767, and Airbus A300/A310 aircraft\n\n**Why it matters:**\n- Oil leakage in engine exhaust cases can indicate serious mechanical problems that could lead to engine failure or fire\n- Airworthiness Directives are legally binding safety orders — compliance is mandatory, not optional\n- Failure to comply can ground aircraft and result in penalties\n\n**How to comply:**\nOperators must follow the inspection procedures detailed in either:\n- FAA Airworthiness Directive 76-12-03 (Amendment 39-2634), or  \n- Australian AD/PW-T/35\n\nThis directive was originally issued in June 1976 (hence \"6/76\"), indicating it addresses a long-standing safety concern for this engine type."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive applies specifically to JT9D engines that contain the listed turbine exhaust case part numbers and requires compliance with the referenced Requirement Document(s). The text contains no statement that expands or narrows coverage beyond that applicability list or the referenced documents, so there is no indication within this instrument that the scope has been changed from the instrument’s stated applicability."},"complexity_factors":["Directive is short but delegates all procedure and schedule detail to external Requirement Documents (FAA AD 76-12-03 or AD/PW-T/35), increasing practical complexity for compliance.","Applicability is defined by a long list of specific turbine exhaust case part numbers, requiring parts-level checks to determine coverage.","Cross-reference to a foreign authority's AD (FAA) requires operators to obtain and reconcile potentially different documents or amendments.","Lack of in-text inspection intervals or corrective action detail creates additional administrative burden to locate and follow the referenced material.","Regulatory enforcement and consequences are under Civil Aviation Regulations and the Civil Aviation Safety Authority, which requires operators to translate the directive into maintenance schedules and recordkeeping."],"plain_english_summary":"This directive requires operators, owners and maintenance organisations of Pratt & Whitney JT9D engines containing the listed turbine exhaust case part numbers to inspect the engine tailpipe/exhaust case for oil leakage. Compliance must follow the referenced Requirement Document(s) (FAA AD 76‑12‑03 or AD/PW‑T/35). Costs of inspections, repairs or part replacement fall to the regulated parties; the Civil Aviation Safety Authority enforces the requirement to detect and correct oil leaks."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jt9d-6-engine-tailpipe-exhaust-case-inspection-for-oil-leakage","history":"/api/acts/ad-jt9d-6-engine-tailpipe-exhaust-case-inspection-for-oil-leakage/history","analysis":"/api/acts/ad-jt9d-6-engine-tailpipe-exhaust-case-inspection-for-oil-leakage/analysis","conflicts":"/api/acts/ad-jt9d-6-engine-tailpipe-exhaust-case-inspection-for-oil-leakage/conflicts","importantCases":"/api/acts/ad-jt9d-6-engine-tailpipe-exhaust-case-inspection-for-oil-leakage/important-cases","documents":"/api/acts/ad-jt9d-6-engine-tailpipe-exhaust-case-inspection-for-oil-leakage/documents"}}