{"id":"F2006B09273","name":"AD/DHE/23 - Minimum Modification Standard at Major Reconditioning","slug":"ad-dhe-23-minimum-modification-standard-at-major-reconditioning","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53303,"registerId":"commonwealth-F2006B09273-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHE/23 - Minimum Modification Standard at Major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/23 Minimum Modification Standard at Major Reconditioning\n\nApplicability: Gipsy Queen 111 and 111A.\n\n# 6/72\n\n \n\nRequirement: Incorporate modifications marked with an asterisk in Rolls Royce Gipsy Technical News Sheet TNS G No. 15 dated 18 February 1970, Appendix 4 dated 27 June 1963.\n\n \n\nCompliance: Before installation 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\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2622},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow technical scope, targeting only specific engine models during major reconditioning events, with no evidence of expansion beyond this original purpose."},"complexity_factors":["Single operative provision with a clear compliance trigger (post-30 June 1972 reconditioning)","External reference to specific technical documentation (Rolls-Royce Technical News Sheet TNS G No. 15 and Appendix 4)","Narrow applicability limited to two specific engine models (Gipsy Queen 111 and 111A)","No interpretation section, defined terms, or internal cross-references"],"plain_english_summary":"**What this directive requires**\n\nThis is a maintenance rule for specific vintage aircraft engines. It mandates safety upgrades when these engines undergo major overhauls.\n\n**Who it applies to**\n\nAnyone responsible for maintaining or operating aircraft with **De Havilland Gipsy Queen 111 or 111A** engines.\n\n**The requirement**\n\nWhenever one of these engines is completely overhauled (major reconditioning) after 30 June 1972, you must incorporate specific design modifications before reinstalling it. \n\nThe required modifications are those marked with an asterisk (*) in:\n* Rolls-Royce Gipsy Technical News Sheet TNS G No. 15 (dated 18 February 1970), and  \n* Appendix 4 to that document (dated 27 June 1963)\n\n**Why this matters**\n\nRather than rebuilding these engines to their original factory condition, this rule ensures they are updated with improved design features that enhance safety and reliability."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhe-23-minimum-modification-standard-at-major-reconditioning","history":"/api/acts/ad-dhe-23-minimum-modification-standard-at-major-reconditioning/history","analysis":"/api/acts/ad-dhe-23-minimum-modification-standard-at-major-reconditioning/analysis","conflicts":"/api/acts/ad-dhe-23-minimum-modification-standard-at-major-reconditioning/conflicts","importantCases":"/api/acts/ad-dhe-23-minimum-modification-standard-at-major-reconditioning/important-cases","documents":"/api/acts/ad-dhe-23-minimum-modification-standard-at-major-reconditioning/documents"}}