{"id":"F2008L04075","name":"AD/PA-25/1 - Fin Post - Modification - CANCELLED","slug":"ad-pa-25-1-fin-post-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":75948,"registerId":"commonwealth-F2008L04075-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Piper PA-25 (Pawnee) Series Aeroplanes","sectionType":"division","heading":"Piper PA-25 (Pawnee) Series Aeroplanes","content":"### Piper PA-25 (Pawnee) Series Aeroplanes\n\n| AD/PA-25/1 | Fin Post - Modification | 12/2008 |\n| ---------- | ----------------------- | ------- |\n\n| Requirement: | CANCELLED.                                                                                                                                                                         |\n| ------------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 20 November 2008.                                                                                                                                          |\n| Background:  | This unique Australian AD specified modification of the fin post in accordance with Piper SL No. 335. Compliance was required before September 1971. The AD is no longer required. |\n\n![](image.001.png)\n\nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n2 October 2008","sortOrder":0},{"sectionNumber":"AD/PA-25/1","sectionType":"part","heading":"AD/PA-25/1","content":"## AD/PA-25/1","sortOrder":1},{"sectionNumber":"Fin Post - Modification","sectionType":"part","heading":"Fin Post - Modification","content":"## Fin Post - Modification","sortOrder":2},{"sectionNumber":"12/2008","sectionType":"part","heading":"12/2008","content":"## 12/2008","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1298},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument reduces rather than expands scope—it completely eliminates the regulatory requirement rather than adding new obligations or extending application to new aircraft types."},"complexity_factors":["Single operative provision (cancellation only)","No defined terms or interpretation section","No conditional logic, exceptions, or procedural requirements","No cross-references to other legislative provisions","Extremely short (under 100 words of substantive content)"],"plain_english_summary":"**What this does:** This document officially cancels a previous safety rule (Airworthiness Directive AD/PA-25/1) that applied to Piper PA-25 Pawnee aircraft.\n\n**Who it affects:** Owners and operators of Piper PA-25 Pawnee aeroplanes—primarily used for agricultural spraying and towing gliders.\n\n**What it means:** The cancelled rule previously required a structural modification to the **fin post** (the vertical support structure at the rear of the aircraft) by September 1971. Because that deadline passed decades ago and the modification is no longer considered necessary for safety, the Civil Aviation Safety Authority (CASA) has withdrawn the directive entirely. Aircraft owners no longer need to comply with this specific rule."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-25-1-fin-post-modification-cancelled","history":"/api/acts/ad-pa-25-1-fin-post-modification-cancelled/history","analysis":"/api/acts/ad-pa-25-1-fin-post-modification-cancelled/analysis","conflicts":"/api/acts/ad-pa-25-1-fin-post-modification-cancelled/conflicts","importantCases":"/api/acts/ad-pa-25-1-fin-post-modification-cancelled/important-cases","documents":"/api/acts/ad-pa-25-1-fin-post-modification-cancelled/documents"}}