{"id":"F2006B08819","name":"AD/DC4/14 - Front Anti-Drag Mount - Rework","slug":"ad-dc4-14-front-anti-drag-mount-rework","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52235,"registerId":"commonwealth-F2006B08819-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DC4/14 - Front Anti-Drag Mount - Rework","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)  Douglas DC4 Series Aeroplanes\n\n \n\nAD/DC4/14 Front Anti-Drag Mount - Rework NK\n\nDocument: 1. Douglas SB (DC4) No. 36, dated 27 November 1946; or\n\n \n\n2. ANO 105.1.16.2.5.13, Issue 2.\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\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, narrow technical directive targeting a specific aircraft type and component. It has not expanded beyond its original purpose of mandating a particular structural repair."},"complexity_factors":["Extremely short document — essentially a reference to external technical standards rather than substantive regulatory text","Only 2 defined document references (the Douglas SB and ANO)","No conditional logic, exceptions, or nested provisions","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","Single operative requirement: perform the rework per specified technical documents"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA) for **Douglas DC-4 series aircraft**.\n\n**What it does:**\n- Requires a specific **rework (repair/modification)** to the **front anti-drag mount** — a structural component that helps resist forces pushing the aircraft backwards during flight or landing.\n- Operators must follow one of two technical documents to complete this work:\n  1. **Douglas Service Bulletin No. 36** dated 27 November 1946, or\n  2. **ANO 105.1.16.2.5.13, Issue 2** (an Airworthiness Notice Order — essentially an official aviation engineering standard).\n\n**Who it affects:**\n- Owners and operators of Douglas DC-4 aircraft registered in Australia.\n- Maintenance engineers working on these vintage aircraft.\n\n**Why it matters:**\n- Airworthiness Directives are **legally binding safety orders**. Non-compliance means the aircraft cannot fly legally.\n- The DC-4 is a 1940s-era aircraft (used extensively in WWII and post-war aviation). This AD addresses a specific structural fatigue or design issue discovered decades ago but still relevant for the few remaining airworthy examples.\n- The \"NK\" notation likely indicates this is a **non-kit** directive (no pre-packaged parts kit required) or relates to compliance tracking."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The supplied text sets out a single, specific requirement: rework of the front anti‑drag mount on Douglas DC‑4 series aeroplanes, to be performed according to one of two referenced documents (Douglas SB No. 36 or ANO 105.1.16.2.5.13). There is no material in the provided text indicating that the AD’s scope has been altered from any earlier intent; the directive appears to impose the rework requirement as stated."},"complexity_factors":["Short, focused directive: the AD mandates a single action (rework of the front anti‑drag mount) which reduces procedural complexity.","Reliance on external technical documents: the AD points to two referenced documents (Douglas SB No. 36 (27 Nov 1946) and ANO 105.1.16.2.5.13 Issue 2) for the actual procedures, creating dependency on obtaining and interpreting those documents.","Age of referenced material: one referenced document is dated 1946, which may complicate locating parts, tools, or contemporary interpretation.","Lack of detail in the AD text provided: absence of explicit compliance times, acceptance criteria, or parts lists increases implementation uncertainty.","Regulatory enforcement layer: compliance is mandatory under Part 39, requiring operators to demonstrate conformity to the referenced procedures, which adds administrative steps."],"plain_english_summary":"This Airworthiness Directive requires Douglas DC‑4 series aircraft to have the front anti‑drag mount reworked, mandating compliance by following one of two referenced documents (Douglas SB No. 36 (27 Nov 1946) or ANO 105.1.16.2.5.13, Issue 2). It affects owners/operators and maintenance organisations: operators must arrange and pay for the work and prove compliance, while the regulator prescribes the acceptable methods by reference."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dc4-14-front-anti-drag-mount-rework","history":"/api/acts/ad-dc4-14-front-anti-drag-mount-rework/history","analysis":"/api/acts/ad-dc4-14-front-anti-drag-mount-rework/analysis","conflicts":"/api/acts/ad-dc4-14-front-anti-drag-mount-rework/conflicts","importantCases":"/api/acts/ad-dc4-14-front-anti-drag-mount-rework/important-cases","documents":"/api/acts/ad-dc4-14-front-anti-drag-mount-rework/documents"}}