{"id":"F2006B08975","name":"AD/DHA-3/19 - Fuselage - Installation of Strengthened Support Brackets - Lower Centre Engine Mounts","slug":"ad-dha-3-19-fuselage-installation-of-strengthened-support-brackets-lower-centre-engine-mounts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52578,"registerId":"commonwealth-F2006B08975-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHA-3/19 - Fuselage - Installation of Strengthened Support Brackets - Lower Centre Engine Mounts","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 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  DHA-3 (Drover) Series Aeroplanes\n\n \n\nAD/DHA-3/19 Fuselage - Installation of Strengthened Support\n\nBrackets - Lower Centre Engine Mounts\n\n\n5/58\n\n \n\nApplicability: All models.\n\n \n\nDocument: 1. DH TNS CT(A3) No. 107; or\n\n \n\n2. DH Mod. DRO 98. Compliance: Forthwith.\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":1422},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original, narrow scope: a specific safety modification for the DHA-3 Drover aircraft type. There is no evidence of scope creep into broader operational requirements or other aircraft types."},"complexity_factors":["Single, unambiguous directive with no exceptions or conditional clauses","Extremely brief text (under 100 words of operative content)","Only two alternative technical reference documents cited","No defined terms section or cross-references to other legislation"],"plain_english_summary":"**What this does:** This is an Airworthiness Directive—a legally binding safety order issued by the Civil Aviation Safety Authority (CASA). It mandates an urgent structural repair to prevent engine mount failure.\n\n**Who it affects:** Owners and operators of **all models** of the DHA-3 (Drover) series aircraft.\n\n**What must be done:** You must install strengthened support brackets on the **lower centre engine mounts** in the fuselage. The work must follow one of these technical manuals:\n*   De Havilland Technical Notes Service (TNS) document CT(A3) No. 107; **or**\n*   De Havilland Modification DRO 98\n\n**When:** Immediately (**'Forthwith'**). This means the aircraft cannot legally fly until the modification is complete.\n\n**Why it matters:** Without these strengthened brackets, the engine mounts could fail, potentially causing an engine to separate from the aircraft or leading to catastrophic structural damage."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dha-3-19-fuselage-installation-of-strengthened-support-brackets-lower-centre-engine-mounts","history":"/api/acts/ad-dha-3-19-fuselage-installation-of-strengthened-support-brackets-lower-centre-engine-mounts/history","analysis":"/api/acts/ad-dha-3-19-fuselage-installation-of-strengthened-support-brackets-lower-centre-engine-mounts/analysis","conflicts":"/api/acts/ad-dha-3-19-fuselage-installation-of-strengthened-support-brackets-lower-centre-engine-mounts/conflicts","importantCases":"/api/acts/ad-dha-3-19-fuselage-installation-of-strengthened-support-brackets-lower-centre-engine-mounts/important-cases","documents":"/api/acts/ad-dha-3-19-fuselage-installation-of-strengthened-support-brackets-lower-centre-engine-mounts/documents"}}