{"id":"F2009L00131","name":"AD/PA-23/57 - Wing Leading Edge - Modification - CANCELLED","slug":"ad-pa-23-57-wing-leading-edge-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":76563,"registerId":"commonwealth-F2009L00131-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Piper PA-23 (Apache and Aztec) Series Ae","sectionType":"division","heading":"Piper PA-23 (Apache and Aztec) Series Aeroplanes","content":"### Piper PA-23 (Apache and Aztec) Series Aeroplanes\n\n| AD/PA-23/57 | Wing Leading Edge - Modification | 2/2009 |\n| ----------- | -------------------------------- | ------ |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                        |\n| ------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 12 February 2009.                                                                                                                                                                         |\n| Background:  | This unique Australian AD specified once-only modification of the PA-23-250 wing leading edge in accordance with Piper SB No. 385 within 100 hours time in service after June 1973. The AD is no longer required. |\n\n![](image.001.png)\n\nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n11 December 2008","sortOrder":0},{"sectionNumber":"AD/PA-23/57","sectionType":"part","heading":"AD/PA-23/57","content":"## AD/PA-23/57","sortOrder":1},{"sectionNumber":"Wing Leading Edge - Modification","sectionType":"part","heading":"Wing Leading Edge - Modification","content":"## Wing Leading Edge - Modification","sortOrder":2},{"sectionNumber":"2/2009","sectionType":"part","heading":"2/2009","content":"## 2/2009","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1787},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":true,"description":"The legislation has been completely cancelled, removing the original mandatory wing leading edge modification requirement for Piper PA-23 aircraft that was the sole purpose of the AD."},"complexity_factors":["Single purpose document (cancellation only)","No defined terms or interpretation sections","No conditional logic, exceptions, or nested provisions","Minimal cross-references (only refers to the aircraft type and cancelled status)","Extremely brief (under 100 words of substantive content)"],"plain_english_summary":"**What this is:** This document officially cancels an old aviation safety rule (Airworthiness Directive AD/PA-23/57) that applied to Piper PA-23 Apache and Aztec aircraft.\n\n**What it originally required:** Owners had to modify the wing leading edge according to Piper Service Bulletin No. 385 within 100 hours of flying time after June 1973.\n\n**What it means now:** As of 12 February 2009, this requirement no longer applies. Owners and operators of these aircraft types no longer need to perform this specific modification to comply with Australian law.\n\n**Who cares:** Anyone who owns, operates, or maintains Piper PA-23 series aircraft in Australia, or needs to know the regulatory history of these planes."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-23-57-wing-leading-edge-modification-cancelled","history":"/api/acts/ad-pa-23-57-wing-leading-edge-modification-cancelled/history","analysis":"/api/acts/ad-pa-23-57-wing-leading-edge-modification-cancelled/analysis","conflicts":"/api/acts/ad-pa-23-57-wing-leading-edge-modification-cancelled/conflicts","importantCases":"/api/acts/ad-pa-23-57-wing-leading-edge-modification-cancelled/important-cases","documents":"/api/acts/ad-pa-23-57-wing-leading-edge-modification-cancelled/documents"}}