{"id":"F2006B08837","name":"AD/DC4/30 - Electric Generator Fan - Removal","slug":"ad-dc4-30-electric-generator-fan-removal","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52307,"registerId":"commonwealth-F2006B08837-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DC4/30 - Electric Generator Fan - Removal","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/DC4/30 Electric Generator Fan - Removal NK\n\nDocument: 1. Eclipse Pioneer SB No. 505; or\n\n \n\n2. FAA AD 53-19-1; or\n\n \n\n3. ANO 105.1.16.2.5.29.\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":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The supplied text does not indicate any change of scope from an earlier instrument or from an original intent. It presents a single Airworthiness Directive entry (AD/DC4/30) prescribing removal of an electric generator fan for Douglas DC4 series aeroplanes and listing three documents as references. There is no information in the text showing that the AD's scope was expanded, narrowed, or otherwise altered."},"complexity_factors":["Cross-reference dependence: The AD does not include technical detail and instead points to three external documents (Eclipse Pioneer SB No. 505; FAA AD 53-19-1; ANO 105.1.16.2.5.29), requiring users to consult multiple sources.","Brevity of primary text: The AD entry contains only the action title and document references, with no timelines, procedures, or explicit applicability statements beyond the aircraft type.","Regulatory framework linkage: The AD is issued under Civil Aviation Regulations 1998, Part 39 (Schedule of Airworthiness Directives), so understanding compliance requires familiarity with that regulatory framework.","Ambiguity marker: The entry contains the notation \"NK\" with the AD title, which is not explained in the text and creates interpretive uncertainty.","Operational uncertainty: The AD prescribes removal of a component without stating operational consequences, replacements, or maintenance approvals."],"plain_english_summary":"What this instrument does (mechanically)\n\n- This is an Airworthiness Directive titled AD/DC4/30, issued under the Civil Aviation Regulations 1998 (Part 39 — Schedule of Airworthiness Directives). It applies to Douglas DC4 series aeroplanes. The directive's stated action is: \"Electric Generator Fan - Removal\" (AD/DC4/30). The AD lists three external documents as authoritative methods or cross-references for the action: Eclipse Pioneer SB No. 505; FAA AD 53-19-1; and ANO 105.1.16.2.5.29. (See header: Civil Aviation Regulations 1998, PART 39 - 105 and AD/DC4/30 entry.)\n\nWho it affects\n\n- The AD affects operators and owners of Douglas DC4 series aeroplanes because it prescribes removal of an electric generator fan on those aircraft (AD/DC4/30). The instrument is published in the Civil Aviation Safety Authority schedule of Airworthiness Directives (Civil Aviation Regulations 1998, Part 39 - Schedule of Airworthiness Directives), which is the regulatory framework that lists mandatory ADs.\n\nWhy it matters (official claim and mechanical follow-up)\n\n- The directive instructs the removal of an electric generator fan. The AD points users to one of three referenced documents for the technical steps or rationale (Eclipse Pioneer SB No. 505; FAA AD 53-19-1; ANO 105.1.16.2.5.29). The AD text itself does not set out technical reasons, timeframes, or costs — it relies on the referenced documents for those details (AD/DC4/30 entry).\n\nImplementation mechanics, incentives and trade-offs\n\n- Who pays and who acts: Because this is listed as an Airworthiness Directive under Part 39, the practical responsibility for compliance will fall on the registered owners/operators of affected DC4 aircraft who must ensure the aircraft meets airworthiness requirements. The AD text does not specify funding, labour, or parts responsibilities; those are typically borne by the operator or owner (Civil Aviation Regulations 1998, PART 39 - 105; AD/DC4/30).\n\n- How compliance is determined: The AD does not contain step-by-step instructions; it points to three external documents as the means of compliance. That creates a dependency on those documents for technical detail, acceptable compliance methods and likely timeframes (AD/DC4/30 — Document: 1, 2, 3).\n\n- Compliance burden and administrative discretion: The AD's brevity means regulatory discretion or administrative interpretation may be required to decide which of the referenced documents or specific procedures are applicable in a particular case. The AD text itself does not state compliance deadlines, inspection intervals, or approval pathways, so implementers must consult the listed documents and the CASA schedule framework (Civil Aviation Regulations 1998, PART 39 - 105; AD/DC4/30).\n\nEffects on private enterprise and maintenance markets (market-liberal lens)\n\n- Maintenance demand: The AD creates a mandatory maintenance action (removal of an aircraft component) for the affected fleet. That generates work and parts demand for maintenance organisations that service DC4-series aeroplanes. The directive’s reliance on external technical documents may concentrate demand on providers familiar with those documents.\n\n- Competition and choice: The AD does not itself limit which maintenance organisations may perform the work; however, operators will need to follow the methods in the referenced documents, which may favour providers familiar with or authorised under those sources. The AD text does not describe approval or certification of alternative methods.\n\nCosts, risks and unintended consequences\n\n- Direct costs: The AD text does not list monetary costs; operators should expect labour, parts, downtime and possible inspection costs associated with removing the electric generator fan (AD/DC4/30).\n\n- Operational effect and substitution risk: The AD directs removal of a component. The AD text does not state whether removal requires replacement, a modification to electrical generation, or limits operations; operators will need to consult the referenced documents for technical consequences. That creates a risk that operators must adopt alternative technical solutions or endure operational limitations if the references require them (AD/DC4/30 — Documents).\n\n- Implementation risk: Because the AD refers to external publications for detailed procedures, timely access to and interpretation of those documents is necessary for consistent compliance. Absent textual details in the AD, different operators may interpret applicability and methods differently until clarified by the referenced sources or by regulatory guidance (Civil Aviation Regulations 1998, PART 39 - 105; AD/DC4/30).\n\nSummary statement\n\n- AD/DC4/30 is a CASA-listed Airworthiness Directive that requires removal of an electric generator fan on Douglas DC4 series aeroplanes and points to three external documents for the technical means of compliance. The text places the practical compliance responsibility on aircraft owners/operators and shifts detailed procedural obligations to the referenced documents. The AD itself does not set out timing, technical steps, costs, or alternative compliance pathways; those items must be taken from the listed documents or regulatory guidance."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive from 1953 (based on the referenced FAA AD 53-19-1). It has not expanded beyond its original narrow purpose of addressing a specific component safety issue on a specific aircraft type."},"complexity_factors":["Extremely short document (under 200 words)","Single, unambiguous action required (removal of one component)","No defined terms section","No conditional logic or exceptions","Simple reference to three external technical documents rather than embedding technical specifications","Applies to only one specific aircraft type (Douglas DC4)"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it as a \"recall notice\" for aircraft, but legally binding.\n\n**What it does:** It requires the **removal of the electric generator fan** from Douglas DC4 series aeroplanes (a vintage four-engine propeller aircraft from the 1940s).\n\n**Who it affects:** Owners and operators of Douglas DC4 aircraft still flying in Australia.\n\n**Why it matters:** The directive references three technical documents that identified a safety problem with this component — likely a risk of failure that could affect electrical generation or engine operation. Compliance is mandatory to keep the aircraft airworthy (legally permitted to fly).\n\n**Key details:**\n- **Identifier:** AD/DC4/30\n- **Aircraft type:** Douglas DC4 Series\n- **Action required:** Remove the electric generator fan\n- **Technical basis:** Eclipse Pioneer Service Bulletin 505, FAA AD 53-19-1, or Australian National Order 105.1.16.2.5.29"}},"importantCases":[],"_links":{"self":"/api/acts/ad-dc4-30-electric-generator-fan-removal","history":"/api/acts/ad-dc4-30-electric-generator-fan-removal/history","analysis":"/api/acts/ad-dc4-30-electric-generator-fan-removal/analysis","conflicts":"/api/acts/ad-dc4-30-electric-generator-fan-removal/conflicts","importantCases":"/api/acts/ad-dc4-30-electric-generator-fan-removal/important-cases","documents":"/api/acts/ad-dc4-30-electric-generator-fan-removal/documents"}}