{"id":"F2009L02322","name":"AD/PT6A/8 - Compressor Rear Hub Hardness - CANCELLED","slug":"ad-pt6a-8-compressor-rear-hub-hardness-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":162226,"registerId":"commonwealth-F2009L02322-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Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Pratt and Whitney Canada Turbine Engines","sectionType":"division","heading":"Pratt and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/8 | Compressor Rear Hub Hardness | 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. 62 or SB No. 1035 before installation in an aircraft following re-conditioning after November 1969. 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/8","sectionType":"part","heading":"AD/PT6A/8","content":"## AD/PT6A/8","sortOrder":1},{"sectionNumber":"Compressor Rear Hub Hardness","sectionType":"part","heading":"Compressor Rear Hub Hardness","content":"## Compressor Rear Hub Hardness","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":1539},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument terminates the regulatory requirement entirely rather than expanding its scope. It represents a complete cessation of the previous airworthiness directive with no addition of new requirements or subjects."},"complexity_factors":["Single operative provision (cancellation only)","No defined terms section","No conditional logic, exceptions, or cross-references to other legislation","Extremely short length (under 100 words of substantive content)"],"plain_english_summary":"**What this does:** This document cancels a previous aviation safety rule (called an Airworthiness Directive) that applied to Pratt & Whitney Canada PT6A series turbine engines — commonly used in regional aircraft and turboprops.\n\n**What the old rule required:** Before installing these engines in an aircraft, operators had to perform specific hardness checks on the compressor rear hub if the engine had been re-conditioned after November 1969. This had to be done following instructions in United Aircraft of Canada Limited (UACL) Service Bulletin No. 62 or No. 1035.\n\n**What changed:** As of 2 July 2009, this safety requirement is **completely cancelled** and no longer applies. The Civil Aviation Safety Authority determined the rule was no longer necessary.\n\n**Who this affects:** Aircraft operators, maintenance organisations, and owners of aircraft powered by PT6A series engines."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pt6a-8-compressor-rear-hub-hardness-cancelled","history":"/api/acts/ad-pt6a-8-compressor-rear-hub-hardness-cancelled/history","analysis":"/api/acts/ad-pt6a-8-compressor-rear-hub-hardness-cancelled/analysis","conflicts":"/api/acts/ad-pt6a-8-compressor-rear-hub-hardness-cancelled/conflicts","importantCases":"/api/acts/ad-pt6a-8-compressor-rear-hub-hardness-cancelled/important-cases","documents":"/api/acts/ad-pt6a-8-compressor-rear-hub-hardness-cancelled/documents"}}