{"id":"F2008L02938","name":"AD/CESSNA 400/4 - Engine Support Beam - Modification - CANCELLED","slug":"ad-cessna-400-4-engine-support-beam-modification-cancelled","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":74883,"registerId":"commonwealth-F2008L02938-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Cessna 400 Series Aeroplanes","sectionType":"division","heading":"Cessna 400 Series Aeroplanes","content":"### Cessna 400 Series Aeroplanes\n\n| AD/CESSNA 400/4 | Engine Support Beam - Modification | 9/2008 |\n| --------------- | ---------------------------------- | ------ |\n\n| Requirement: | CANCELLED.                                                                                                                                                                                                                                                                                  |\n| ------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n|              | This AD is cancelled on 28 August 2008.                                                                                                                                                                                                                                                     |\n| Background:  | This unique Australian AD, issued in 1967, required modification of the engine support beam in accordance with Cessna Service Letter 67-34. The compliance time of this AD was within 50 hours time in service. As all aircraft would have now been modified, the AD is no longer required. |\n\n![](image.001.png)\n\nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n18 July 2008","sortOrder":0},{"sectionNumber":"AD/CESSNA 400/4","sectionType":"part","heading":"AD/CESSNA 400/4","content":"## AD/CESSNA 400/4","sortOrder":1},{"sectionNumber":"Engine Support Beam - Modification","sectionType":"part","heading":"Engine Support Beam - Modification","content":"## Engine Support Beam - Modification","sortOrder":2},{"sectionNumber":"9/2008","sectionType":"part","heading":"9/2008","content":"## 9/2008","sortOrder":3}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1199},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This instrument performs exactly one function: cancelling Airworthiness Directive AD/CESSNA 400/4. Its scope has not expanded beyond this specific administrative purpose of removing a superseded safety requirement."},"complexity_factors":["Single operative provision (cancellation)","No defined terms or interpretation sections","No cross-references to other legislative instruments","No conditional logic, exceptions, or procedural steps"],"plain_english_summary":"This document officially cancels a 41-year-old aviation safety rule that applied to Cessna 400 series aircraft. The original rule (issued in 1967) required owners to modify the **engine support beam** — the structural part that attaches the engine to the airframe — within 50 hours of flying time to prevent failure. Because every affected aircraft would have completed this mandatory repair decades ago, the Civil Aviation Safety Authority has removed the rule entirely as it is no longer needed. This is essentially a housekeeping measure to clean up outdated requirements."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-400-4-engine-support-beam-modification-cancelled","history":"/api/acts/ad-cessna-400-4-engine-support-beam-modification-cancelled/history","analysis":"/api/acts/ad-cessna-400-4-engine-support-beam-modification-cancelled/analysis","conflicts":"/api/acts/ad-cessna-400-4-engine-support-beam-modification-cancelled/conflicts","importantCases":"/api/acts/ad-cessna-400-4-engine-support-beam-modification-cancelled/important-cases","documents":"/api/acts/ad-cessna-400-4-engine-support-beam-modification-cancelled/documents"}}