{"id":"F2009L02328","name":"AD/PT6A/23 - Replacement of Compressor Delivery Heated Air Tube by a Non-Metallic Hose - CANCELLED","slug":"ad-pt6a-23-replacement-of-compressor-delivery-heated-air-tube-by-a-non-metallic-hose-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":79090,"registerId":"commonwealth-F2009L02328-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Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Pratt and Whitney Canada Turbine Engines","sectionType":"division","heading":"Pratt and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 - PT6A Series","content":"### Pratt and Whitney Canada Turbine Engines - PT6A Series\n\n| AD/PT6A/23 | Replacement of Compressor DeliveryHeated Air Tube by a Non-Metallic Hose | 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 PWC SB No. 12024 before next hot-section inspection or next overhaul, whichever is sooner. 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/23","sectionType":"part","heading":"AD/PT6A/23","content":"## AD/PT6A/23","sortOrder":1},{"sectionNumber":"Replacement of Compressor DeliveryHeated","sectionType":"part","heading":"Replacement of Compressor DeliveryHeated Air Tube by a Non-Metallic Hose","content":"## Replacement of Compressor Delivery  \nHeated Air Tube by a Non-Metallic Hose","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":1491},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"The directive has been completely cancelled rather than expanded. The original scope (mandating a specific component replacement) has been eliminated entirely as the requirement is 'no longer required' per the background statement."},"complexity_factors":["Single-sentence cancellation with no operative legal provisions","No defined terms, interpretation section, or legislative cross-references","No conditional logic, exceptions, or procedural requirements","Document consists entirely of administrative cancellation notice and background context","Extremely short length (under 150 words of substantive content)"],"plain_english_summary":"**What this is:** This document officially cancels a previous aviation safety rule (Airworthiness Directive AD/PT6A/23) that applied to specific aircraft turbine engines.\n\n**What it originally required:** The now-cancelled rule previously mandated that owners and operators of **Pratt & Whitney Canada PT6A series engines** replace a metal compressor delivery heated air tube with a non-metallic hose. This work had to be completed before the next hot-section inspection or engine overhaul (whichever came first), following the manufacturer's Service Bulletin No. 12024.\n\n**Who it affects:** Aircraft owners, operators, and maintenance organisations responsible for PT6A series turbine engines (commonly used in regional airliners, agricultural aircraft, and utility planes).\n\n**Why it matters:** As of **2 July 2009**, this specific tube replacement requirement is **no longer mandatory**. Operators are no longer legally required to perform this modification, though they must continue to comply with other applicable airworthiness requirements."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pt6a-23-replacement-of-compressor-delivery-heated-air-tube-by-a-non-metallic-hose-cancelled","history":"/api/acts/ad-pt6a-23-replacement-of-compressor-delivery-heated-air-tube-by-a-non-metallic-hose-cancelled/history","analysis":"/api/acts/ad-pt6a-23-replacement-of-compressor-delivery-heated-air-tube-by-a-non-metallic-hose-cancelled/analysis","conflicts":"/api/acts/ad-pt6a-23-replacement-of-compressor-delivery-heated-air-tube-by-a-non-metallic-hose-cancelled/conflicts","importantCases":"/api/acts/ad-pt6a-23-replacement-of-compressor-delivery-heated-air-tube-by-a-non-metallic-hose-cancelled/important-cases","documents":"/api/acts/ad-pt6a-23-replacement-of-compressor-delivery-heated-air-tube-by-a-non-metallic-hose-cancelled/documents"}}