{"id":"F2006B06373","name":"AD/PT6T/2 - Check and Regulating Valve Housing Reinforcing Bracket","slug":"ad-pt6t-2-check-and-regulating-valve-housing-reinforcing-bracket","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47636,"registerId":"commonwealth-F2006B06373-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PT6T/2 - Check and Regulating Valve Housing Reinforcing Bracket","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 Canada Turbine Engines - PT6T Series\n\n \n\nAD/PT6T/2  Check and Regulating Valve Housing Reinforcing Bracket\n\nApplicability: All PT6T-3 power sections prior to S/No. CP-PS60553. Document:  1. UACL SB No. 5063, Rev. 1; or\n\n2. AD/UAC-T/22. Compliance: Before 31 January 1975.\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\n10/85\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1812},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow technical scope—mandating a specific airworthiness action for defined engine models. No legislative drift or scope expansion is evident."},"complexity_factors":["Extremely concise text (under 75 words of substantive content)","Single applicability criterion based on serial number threshold","Single compliance action referencing external technical documents","No exceptions, conditions, or defined terms"],"plain_english_summary":"**What this does:** This Airworthiness Directive (AD) requires operators of specific Pratt & Whitney Canada aircraft engines to inspect or modify a reinforcing bracket on the check and regulating valve housing.\n\n**Who it affects:** Owners and operators of aircraft fitted with PT6T-3 power sections (engine serial numbers prior to CP-PS60553).\n\n**What must be done:** Follow the technical instructions in either:\n* United Aircraft of Canada Limited Service Bulletin No. 5063 (Revision 1); or  \n* Airworthiness Directive AD/UAC-T/22\n\n**Deadline:** The work had to be completed before 31 January 1975.\n\n**Why it matters:** The reinforcing bracket ensures the structural integrity of the valve housing. This directive prevents potential engine failure due to structural defects in this critical component."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pt6t-2-check-and-regulating-valve-housing-reinforcing-bracket","history":"/api/acts/ad-pt6t-2-check-and-regulating-valve-housing-reinforcing-bracket/history","analysis":"/api/acts/ad-pt6t-2-check-and-regulating-valve-housing-reinforcing-bracket/analysis","conflicts":"/api/acts/ad-pt6t-2-check-and-regulating-valve-housing-reinforcing-bracket/conflicts","importantCases":"/api/acts/ad-pt6t-2-check-and-regulating-valve-housing-reinforcing-bracket/important-cases","documents":"/api/acts/ad-pt6t-2-check-and-regulating-valve-housing-reinforcing-bracket/documents"}}