{"id":"F2006B09274","name":"AD/DHE/24 - Minimum Modification Standard at Major Reconditioning","slug":"ad-dhe-24-minimum-modification-standard-at-major-reconditioning","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53305,"registerId":"commonwealth-F2006B09274-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHE/24 - Minimum Modification Standard at Major Reconditioning","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  De Havilland Piston Engines\n\n \n\n# AD/DHE/24 Minimum Modification Standard at Major Reconditioning\n\nApplicability: Gipsy Six 1 and 1A, and Gipsy Six 11.\n\n# 6/72\n\n \n\nDocument: R. Royce Gipsy TNS G No. 15 dated 18 February 1970 and Appendix 2 dated 27 June 1963.\n\n \n\nCompliance: Before installation in an aircraft following next reconditioning completed after 30 June 1972.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2058},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive retains its original 1972 scope, targeting only specific vintage De Havilland Gipsy Six engine models during major reconditioning. It has not expanded to cover additional engine types or maintenance scenarios beyond the original technical mandate."},"complexity_factors":["Extremely narrow applicability limited to three specific engine model variants","Single unconditional compliance requirement with no exceptions or alternative methods","Minimal cross-referencing (only two external technical documents)","No defined terms, interpretation clauses, or conditional logic","Document length of approximately 50 words excluding references"],"plain_english_summary":"Owners and maintainers of vintage De Havilland Gipsy Six 1, 1A, and 11 piston engines must ensure engines overhauled after 30 June 1972 incorporate specified safety modifications before reinstallation.  \n\nThis mandatory Airworthiness Directive requires compliance with the R. Royce Gipsy TNS G No. 15 technical standard (Feb 1970) and its Appendix 2 (Jun 1963) to prevent returning older engines to service without critical safety updates."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhe-24-minimum-modification-standard-at-major-reconditioning","history":"/api/acts/ad-dhe-24-minimum-modification-standard-at-major-reconditioning/history","analysis":"/api/acts/ad-dhe-24-minimum-modification-standard-at-major-reconditioning/analysis","conflicts":"/api/acts/ad-dhe-24-minimum-modification-standard-at-major-reconditioning/conflicts","importantCases":"/api/acts/ad-dhe-24-minimum-modification-standard-at-major-reconditioning/important-cases","documents":"/api/acts/ad-dhe-24-minimum-modification-standard-at-major-reconditioning/documents"}}