{"id":"F2009L02321","name":"AD/PT6A/7 - Re-Routing Of Governor Air Pressure Line - CANCELLED","slug":"ad-pt6a-7-re-routing-of-governor-air-pressure-line-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":162225,"registerId":"commonwealth-F2009L02321-current","compilationNumber":null,"startDate":"2026-04-04","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Pratt and Whitney Canada Turbine Engines","sectionType":"division","heading":"Pratt and Whitney Canada Turbine Engines - PT6A Series","content":"### Pratt and Whitney Canada Turbine Engines - PT6A Series\n\n| AD/PT6A/7 | Re-Routing Of Governor Air Pressure Line | 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. 27 or SB No. 1013 before installation in an aircraft following re-conditioning after April 1966. 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/PT6A/7","sectionType":"part","heading":"AD/PT6A/7","content":"## AD/PT6A/7","sortOrder":1},{"sectionNumber":"Re-Routing Of Governor Air Pressure Line","sectionType":"part","heading":"Re-Routing Of Governor Air Pressure Line","content":"## Re-Routing Of Governor Air Pressure Line","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":2045},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":true,"description":"The original legislation imposed mandatory maintenance actions (re-routing of governor air pressure lines following engine re-conditioning). This instrument eliminates those requirements entirely, changing the scope from active safety regulation to nil."},"complexity_factors":["Single operative provision (cancellation of the previous directive)","No defined terms or interpretation section","No conditional logic, exceptions, or procedural steps","Background information provided for historical context only"],"plain_english_summary":"**What this does:** This document cancels an earlier aircraft safety rule (called an Airworthiness Directive or AD) that applied to specific Pratt & Whitney Canada PT6A turbine engines.\n\n**Who it affects:** Aircraft operators and maintenance organisations that use or service these engines—commonly found in regional airliners, cargo aircraft, and agricultural planes.\n\n**What has changed:** The previous rule required mechanics to re-route a specific air pressure line (the governor air pressure line) whenever installing a re-conditioned engine that had been overhauled after April 1966. As of 2 July 2009, this requirement no longer applies.\n\n**Why it matters:** This reduces regulatory burden by removing an outdated maintenance obligation. The original rule addressed a specific safety issue identified in the 1960s, but the Civil Aviation Safety Authority has determined it is no longer necessary—likely because the affected engine population has been modified, retired, or the risk is now managed through other means."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pt6a-7-re-routing-of-governor-air-pressure-line-cancelled","history":"/api/acts/ad-pt6a-7-re-routing-of-governor-air-pressure-line-cancelled/history","analysis":"/api/acts/ad-pt6a-7-re-routing-of-governor-air-pressure-line-cancelled/analysis","conflicts":"/api/acts/ad-pt6a-7-re-routing-of-governor-air-pressure-line-cancelled/conflicts","importantCases":"/api/acts/ad-pt6a-7-re-routing-of-governor-air-pressure-line-cancelled/important-cases","documents":"/api/acts/ad-pt6a-7-re-routing-of-governor-air-pressure-line-cancelled/documents"}}