{"id":"F2006B08829","name":"AD/DC4/23 - Generator Field Lead - Modification","slug":"ad-dc4-23-generator-field-lead-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52269,"registerId":"commonwealth-F2006B08829-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DC4/23 - Generator Field Lead - Modification","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/DC4/23 Generator Field Lead - Modification NK\n\nDocument: 1. Douglas SB (DC4) No. 63, dated 15 April 1947 and Addendum dated 22 August\n\n1947; or\n\n \n\n2. ANO 105.1.16.2.5.22, 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","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive focused on a specific technical modification for a specific aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (approximately 200 words)","Only one substantive requirement (modification of generator field lead)","Two alternative compliance documents referenced (Douglas SB or ANO)","No defined terms section","No conditional logic or nested exceptions","Single aircraft type applicability (Douglas DC-4 Series)","No cross-references to other legislation beyond the cited 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 owners and operators of DC-4 aeroplanes to modify the **generator field lead** (an electrical wiring component that controls the aircraft's generator).\n- The modification must be done according to specific technical documents: either Douglas Service Bulletin No. 63 (dated April 1947, with an August 1947 addendum) or Air Navigation Order 105.1.16.2.5.22, Issue 2.\n\n**Who it affects:**\n- Anyone who owns, operates, or maintains Douglas DC-4 aircraft in Australia.\n\n**Why it matters:**\n- Airworthiness Directives are legally binding safety orders. They are issued when a safety issue is discovered that could affect flight safety. Compliance is mandatory — you cannot legally fly the aircraft until the required work is done.\n- This particular AD addresses a specific technical issue with the generator field lead, likely to prevent electrical failures that could affect the aircraft's power generation systems."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The provided text does not indicate any alteration to the AD's scope compared with earlier materials; it sets a requirement to modify the generator field lead and specifies two documents as acceptable methods of compliance (Douglas SB (DC4) No. 63 and ANO 105.1.16.2.5.22, Issue 2). The instrument as supplied contains no explicit statement that it widens or narrows scope from a prior directive or from the referenced documents."},"complexity_factors":["Short, narrowly focused directive with a single technical subject (generator field lead modification).","Reliance on external technical documents for the substantive requirements (Douglas SB No. 63 and ANO 105.1.16.2.5.22).","Lack of procedural detail in the AD text itself (no timelines, applicability details, or alternative methods listed).","Technical implementation requires specialised maintenance skills and possible parts procurement, creating operational complexity despite simple regulatory text.","Potential ambiguity over scope and applicability because the AD as provided does not include serial‑number, date‑by‑which compliance is required, or statement of affected models beyond \"Douglas DC4 Series.\""],"plain_english_summary":"This instrument is an Airworthiness Directive (AD) issued under the Civil Aviation Regulations (Part 39) by the Civil Aviation Safety Authority affecting Douglas DC‑4 series aeroplanes. Its title is \"Generator Field Lead - Modification\" (AD/DC4/23). The directive requires a modification to the aircraft electrical generator's field lead and prescribes acceptable ways to comply. Specifically, compliance may be achieved by following either: (a) Douglas Service Bulletin (DC4) No. 63, dated 15 April 1947 with its Addendum dated 22 August 1947, or (b) ANO 105.1.16.2.5.22, Issue 2 (as listed under the directive). (Source: AD/DC4/23 title and Document listing.)\n\nWho it affects\n- Owners and operators of Douglas DC‑4 series aeroplanes registered in the Commonwealth jurisdiction covered by the AD. (Source: heading naming the aircraft type and the AD.)\n\nWho pays and who decides\n- Aircraft owners/operators bear the cost and operational impact (labour, parts, downtime) of carrying out the modification. (Implied by the AD requirement to modify the aircraft.)\n- The Civil Aviation Safety Authority issues the AD and prescribes acceptable compliance documents; operators choose which of the listed documents to follow to meet the AD. (Source: AD title and the two listed compliance documents.)\n\nWhat the AD changes mechanically\n- It obliges operators to modify the generator field lead on affected aircraft and limits acceptable methods of compliance to the two referenced documents. The AD does not itself include the technical steps; it points to the service bulletin or the ANO document for the required modification procedure. (Source: Document: 1. Douglas SB (DC4) No. 63... or 2. ANO 105.1.16.2.5.22, Issue 2.)\n\nCosts, incentives and trade‑offs\n- Direct costs: parts and labour to perform the modification, plus aircraft downtime while work is done. (Implied by a mandatory aircraft modification requirement.)\n- Incentives: to regain legal airworthiness status, operators must perform the modification by one of the listed methods; choosing between the two referenced documents may reflect differences in cost or availability of parts/skills but the AD constrains the choice to those methods. (Source: Document list.)\n- Implementation risk and compliance burden: the AD relies on externally referenced technical documents. If those documents are old, unavailable, or require specific technical skills or parts, operators may face added delay or expense. The AD text as provided does not specify time limits, serial‑number applicability, or alternative methods, so uncertainty about applicability and scheduling remains unless clarified elsewhere. (Source: AD title and Document listing; absence of further details in the provided text.)\n\nBureaucratic discretion and private choice\n- The AD narrows operator discretion by naming only two acceptable compliance documents. The choice of which document to apply is therefore constrained to those listed. Any variation from those methods would require separate approval from the regulator (not stated in the provided text). (Source: Document listing.)\n\nPractical note on implementation\n- The AD references the required technical sources rather than reproducing procedures; operators must obtain and follow either the Douglas service bulletin (and its addendum) or the stated ANO document to perform the modification and regain compliance. (Source: Document listing.)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-dc4-23-generator-field-lead-modification","history":"/api/acts/ad-dc4-23-generator-field-lead-modification/history","analysis":"/api/acts/ad-dc4-23-generator-field-lead-modification/analysis","conflicts":"/api/acts/ad-dc4-23-generator-field-lead-modification/conflicts","importantCases":"/api/acts/ad-dc4-23-generator-field-lead-modification/important-cases","documents":"/api/acts/ad-dc4-23-generator-field-lead-modification/documents"}}