{"id":"F2009L00891","name":"AD/CERES/7 Amdt 1 - Turnover Truss - Modification - CANCELLED","slug":"ad-ceres-7-amdt-1-turnover-truss-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":78202,"registerId":"commonwealth-F2009L00891-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"C.A.C. CA-28 (Ceres) Series Aeroplanes","sectionType":"division","heading":"C.A.C. CA-28 (Ceres) Series Aeroplanes","content":"### C.A.C. CA-28 (Ceres) Series Aeroplanes\n\n| AD/CERES/7 Amdt 1 | Turnover Truss - Modification | 4/2009 |\n| ----------------- | ----------------------------- | ------ |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                                                                                         |\n| ------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 9 April 2009.                                                                                                                                                                                                                                                              |\n| Background:  | This unique Australian AD was first raised in 1980 to require modification of the Turnover Truss following an accident where the truss collapsed. Compliance was required no later than 21 January 1980.As all affected aircraft would have been modified long ago, this AD is no longer required. |\n\n![](image.001.png)\n\nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n26 February 2009","sortOrder":0},{"sectionNumber":"AD/CERES/7 Amdt 1","sectionType":"part","heading":"AD/CERES/7 Amdt 1","content":"## AD/CERES/7 Amdt 1","sortOrder":1},{"sectionNumber":"Turnover Truss - Modification","sectionType":"part","heading":"Turnover Truss - Modification","content":"## Turnover Truss - Modification","sortOrder":2},{"sectionNumber":"4/2009","sectionType":"part","heading":"4/2009","content":"## 4/2009","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1947},"content_quality":"ok","complexity_score":1,"rejection_reason":"","scope_assessment":{"changed":false,"description":"This instrument terminates regulation rather than expanding it. The scope is narrowed to zero by cancelling the previous airworthiness directive for this aircraft type."},"complexity_factors":["Single operative provision consisting solely of a cancellation clause","No defined terms, cross-references, or conditional logic","Purely administrative removal of an obsolete requirement with no ongoing compliance obligations"],"plain_english_summary":"This document **cancels an outdated aviation safety rule** that required modifications to a specific type of agricultural aircraft.\n\n**What it was about:**\n- The original rule required owners of C.A.C. CA-28 Ceres crop-duster planes to fix or replace the 'turnover truss' — a structural part that prevents the plane from tipping over during loading or rough landings.\n- This rule was first made after a serious accident where the truss collapsed on one of these aircraft.\n\n**Why it's being cancelled:**\n- The deadline for fixing the truss was January 1980 — meaning all affected planes were required to be modified decades ago.\n- Because every aircraft has long since been modified, the safety rule is now redundant and is being removed from the books."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ceres-7-amdt-1-turnover-truss-modification-cancelled","history":"/api/acts/ad-ceres-7-amdt-1-turnover-truss-modification-cancelled/history","analysis":"/api/acts/ad-ceres-7-amdt-1-turnover-truss-modification-cancelled/analysis","conflicts":"/api/acts/ad-ceres-7-amdt-1-turnover-truss-modification-cancelled/conflicts","importantCases":"/api/acts/ad-ceres-7-amdt-1-turnover-truss-modification-cancelled/important-cases","documents":"/api/acts/ad-ceres-7-amdt-1-turnover-truss-modification-cancelled/documents"}}