{"id":"F2009L00132","name":"AD/PA-23/59 - Wing Rear Spar - Inspection - CANCELLED","slug":"ad-pa-23-59-wing-rear-spar-inspection-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":76565,"registerId":"commonwealth-F2009L00132-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Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Piper PA-23 (Apache and Aztec) Series Ae","sectionType":"division","heading":"Piper PA-23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-23/59 | Wing Rear Spar - Inspection | 2/2009 |\n| ----------- | --------------------------- | ------ |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                                                                                 |\n| ------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n|              | This AD is cancelled on 12 February 2009.                                                                                                                                                                                                                                                  |\n| Background:  | This unique Australian AD specified annual inspection of the wing rear spar and spar attachment in accordance with Piper SL No. 672. The absence of service difficulty reports related to the wing rear spar indicates that using an AD to mandate this inspection is no longer justified. |\n\n![](image.001.png)\n\nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n23 December 2008","sortOrder":0},{"sectionNumber":"AD/PA-23/59","sectionType":"part","heading":"AD/PA-23/59","content":"## AD/PA-23/59","sortOrder":1},{"sectionNumber":"Wing Rear Spar - Inspection","sectionType":"part","heading":"Wing Rear Spar - Inspection","content":"## Wing Rear Spar - Inspection","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":false,"description":"The instrument performs exactly as indicated by its title and purpose—it cancels a specific airworthiness directive without expanding regulatory scope into other aircraft systems or maintenance areas."},"complexity_factors":["Single, unambiguous operative provision (cancellation)","No defined terms or interpretation section","No conditional logic, exceptions, or nested provisions","Minimal cross-referencing (only cites the superseded directive)"],"plain_english_summary":"This document **cancels a previous aircraft safety rule** that forced owners of certain Piper planes to inspect their wing rear spars every year.\n\n**Who this affects:**\nOwners and operators of **Piper PA-23 Apache and Aztec** series aircraft.\n\n**What changes:**\n*   You are **no longer required** to perform the annual inspection of the wing rear spar and its attachments.\n*   This removes the maintenance obligation previously mandated under Australian Airworthiness Directive AD/PA-23/59.\n\n**Why it matters:**\nThe Civil Aviation Safety Authority (CASA) cancelled this requirement because safety data showed no service difficulties or defects with these wing spars. When a safety rule is no longer justified by actual risk, it gets removed to reduce unnecessary compliance costs for aircraft owners."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-23-59-wing-rear-spar-inspection-cancelled","history":"/api/acts/ad-pa-23-59-wing-rear-spar-inspection-cancelled/history","analysis":"/api/acts/ad-pa-23-59-wing-rear-spar-inspection-cancelled/analysis","conflicts":"/api/acts/ad-pa-23-59-wing-rear-spar-inspection-cancelled/conflicts","importantCases":"/api/acts/ad-pa-23-59-wing-rear-spar-inspection-cancelled/important-cases","documents":"/api/acts/ad-pa-23-59-wing-rear-spar-inspection-cancelled/documents"}}