{"id":"F2009L02330","name":"AD/PT6T/2 - Check and Regulating Valve Housing Reinforcing Bracket - CANCELLED","slug":"ad-pt6t-2-check-and-regulating-valve-housing-reinforcing-bracket-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":79097,"registerId":"commonwealth-F2009L02330-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Pratt and Whitney Canada Turbine Engines","sectionType":"division","heading":"Pratt and Whitney Canada Turbine Engines - PT6T Series","content":"### Pratt and Whitney Canada Turbine Engines - PT6T Series\n\n| AD/PT6T/2 | Check and Regulating ValveHousing Reinforcing Bracket | 7/2009 |\n| --------- | ----------------------------------------------------- | ------ |\n\n| Requirement: | CANCELLED.                                                                                                                        |\n| ------------ | --------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 2 July 2009.                                                                                              |\n| Background:  | This unique Australian AD specified action in accordance with UACL SB No. 5063 before January 1975. The AD is no longer required. |\n\n![](image.001.png)\n\nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n18 May 2009","sortOrder":0},{"sectionNumber":"AD/PT6T/2","sectionType":"part","heading":"AD/PT6T/2","content":"## AD/PT6T/2","sortOrder":1},{"sectionNumber":"Check and Regulating ValveHousing Reinfo","sectionType":"part","heading":"Check and Regulating ValveHousing Reinforcing Bracket","content":"## Check and Regulating Valve  \nHousing Reinforcing Bracket","sortOrder":2},{"sectionNumber":"7/2009","sectionType":"part","heading":"7/2009","content":"## 7/2009","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1678},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument does not modify the scope of regulatory requirements; it terminates the legal effect of the previous AD entirely, eliminating the obligation rather than expanding or altering it."},"complexity_factors":["Single operative word: 'CANCELLED'","No defined terms or interpretation clauses","No conditional logic, exceptions, or procedural steps","Document consists solely of a cancellation declaration and historical context"],"plain_english_summary":"**What this does:**\nThis officially cancels a previous aviation safety rule (Airworthiness Directive AD/PT6T/2) that required operators to inspect or replace the reinforcing bracket on the check and regulating valve housing of Pratt & Whitney Canada PT6T turbine engines.\n\n**Who it affects:**\nAircraft operators and maintenance organisations using Pratt & Whitney PT6T engines (commonly found in helicopters such as the Bell 412 and aircraft like the de Havilland Canada DHC-6 Twin Otter).\n\n**Why it matters:**\nThe original directive required compliance with Service Bulletin No. 5063 before January 1975. This cancellation removes that legal obligation entirely, effective from 2 July 2009. This suggests the safety issue addressed by the original 1970s-era requirement has been resolved through retirement of affected components, fleet turnover, or alternative safety measures."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pt6t-2-check-and-regulating-valve-housing-reinforcing-bracket-cancelled","history":"/api/acts/ad-pt6t-2-check-and-regulating-valve-housing-reinforcing-bracket-cancelled/history","analysis":"/api/acts/ad-pt6t-2-check-and-regulating-valve-housing-reinforcing-bracket-cancelled/analysis","conflicts":"/api/acts/ad-pt6t-2-check-and-regulating-valve-housing-reinforcing-bracket-cancelled/conflicts","importantCases":"/api/acts/ad-pt6t-2-check-and-regulating-valve-housing-reinforcing-bracket-cancelled/important-cases","documents":"/api/acts/ad-pt6t-2-check-and-regulating-valve-housing-reinforcing-bracket-cancelled/documents"}}