{"id":"F2006B07426","name":"AD/TPE 331/18 - Fuel Control Bracket - Replacement","slug":"ad-tpe-331-18-fuel-control-bracket-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49692,"registerId":"commonwealth-F2006B07426-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TPE 331/18 - Fuel Control Bracket - Replacement","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 331/18 Fuel Control Bracket - Replacement 3/86\n\nApplicability: Models : TPE-331-1-151B, TPE-331-2-201C, TPE-331-5-251C, TPE-331-5-251K.\n\nTPE-331-6-251M, TPE-331-3U-307G, Specified by Series numbers in reference documents.\n\n \n\nDocument: 1. AiResearch SB TPE-331-73-0028 Rev. 2 and SB TPE-331-73-0029; or\n\n \n\n2.    FAA AD 74-10-10 as amended by amendment No. 2253; or\n\n \n\n3.    AD/AIR-T/23A.\n\n \n\nCompliance: SB TPE-331-73-0028 Rev. 2: Within 100 hours time in service after 30 September 1975 and thereafter at intervals not exceeding 100 hours time in service until SB TPE- 331-0029 is incorporated. SB TPE-331-73-0029: Before installation in an aircraft following next reconditioning after 31 July 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","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted airworthiness directive addressing a specific mechanical defect in specific engine models. It has not expanded beyond its original safety purpose."},"complexity_factors":["Single technical requirement (bracket replacement/inspection)","Only 6 specific engine models affected","Straightforward two-stage compliance timeline","References only 3 external technical documents (service bulletins and FAA directive)","No defined terms section or interpretation provisions","No conditional exceptions or nested logic","Approximately 150 words of substantive content"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators and maintenance organisations of specified AlliedSignal (Garrett/AiResearch) TPE331 engines to address a defective fuel-control mounting bracket that can cause engine failure or fire. \n\nIt mandates interim inspections every 100 flight hours until a permanent improved bracket is fitted at the next engine reconditioning (post‑July 1974). Compliance is mandatory for legal flight in Australia."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The supplied text sets applicability and compliance requirements but contains no information showing a change in scope from an earlier instrument. Based on this document alone, scope appears fixed as stated (Applicability; Document; Compliance)."},"complexity_factors":["Cross-references to multiple external documents (AiResearch SB TPE-331-73-0028 Rev.2, SB TPE-331-73-0029, FAA AD 74-10-10, AD/AIR-T/23A) (Document)","Dated compliance triggers using historical cutoff dates and continuing 100‑hour inspection intervals until incorporation of a later bulletin (Compliance)","Applicability limited to specific TPE‑331 models and series numbers, requiring operators to confirm whether engines fall within scope (Applicability)","Two-step compliance path: interim repetitive inspections (until SB 0029 incorporated) and mandatory installation at reconditioning, which affects maintenance planning (Compliance)"],"plain_english_summary":"This airworthiness directive requires owners/operators of specified AlliedSignal (Garrett/AiResearch) TPE‑331 engine models to inspect and replace the fuel control bracket per the AiResearch service bulletins or the referenced FAA AD. It mandates inspections at 100‑hour intervals after 30 September 1975 until the later service bulletin is fitted, and requires fitting the updated bracket at the next reconditioning after 31 July 1974. (Applicability; Document; Compliance). Owners/operators and their maintenance providers must schedule and pay for the work; CASA issues the directive."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tpe-331-18-fuel-control-bracket-replacement","history":"/api/acts/ad-tpe-331-18-fuel-control-bracket-replacement/history","analysis":"/api/acts/ad-tpe-331-18-fuel-control-bracket-replacement/analysis","conflicts":"/api/acts/ad-tpe-331-18-fuel-control-bracket-replacement/conflicts","importantCases":"/api/acts/ad-tpe-331-18-fuel-control-bracket-replacement/important-cases","documents":"/api/acts/ad-tpe-331-18-fuel-control-bracket-replacement/documents"}}