{"id":"F2006B07423","name":"AD/TPE 331/15 - Heated Pneumatic Line - Installation","slug":"ad-tpe-331-15-heated-pneumatic-line-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49682,"registerId":"commonwealth-F2006B07423-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TPE 331/15 - Heated Pneumatic Line - Installation","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)  AlliedSignal (Garrett/AiResearch) Turbine Engines - TPE 331 Series\n\n \n\nAD/TPE 331/15 Heated Pneumatic Line - Installation 3/86\n\nApplicability: TPE-331-2-201C prior to Series No. 6. TPE-331-5-251C prior to Series No. 3. TPE- 331-5-251K prior to series No. 17.\n\n \n\nDocument: AiResearch SB TPE-331-73-0023, Rev. 1.; or AD/AIR-T/18A.\n\nCompliance: Within 100 hours time in service after 30 April 1974.\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":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2592},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow technical scope concerning heated pneumatic line installations for specific TPE-331 engine models. There is no evidence of expansion beyond the original safety maintenance requirement."},"complexity_factors":["Incorporation by reference to external technical service bulletin (AiResearch SB TPE-331-73-0023, Rev. 1) not provided in the directive text","Narrow applicability criteria requiring verification of specific engine series numbers","Alternative compliance pathway referencing another directive (AD/AIR-T/18A)"],"plain_english_summary":"This mandatory Airworthiness Directive requires owners/operators to modify the heated pneumatic line installation on specified older AlliedSignal (Garrett/AiResearch) TPE-331 turbine engines (certain TPE-331-2-201C, -5-251C, and -5-251K units built before specified series). Compliance must follow AiResearch Service Bulletin TPE-331-73-0023 Revision 1 (or previous AD/AIR-T/18A) within 100 flight hours after 30 April 1974 to prevent pneumatic-system failures that could affect flight safety."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tpe-331-15-heated-pneumatic-line-installation","history":"/api/acts/ad-tpe-331-15-heated-pneumatic-line-installation/history","analysis":"/api/acts/ad-tpe-331-15-heated-pneumatic-line-installation/analysis","conflicts":"/api/acts/ad-tpe-331-15-heated-pneumatic-line-installation/conflicts","importantCases":"/api/acts/ad-tpe-331-15-heated-pneumatic-line-installation/important-cases","documents":"/api/acts/ad-tpe-331-15-heated-pneumatic-line-installation/documents"}}