{"id":"F2006B08848","name":"AD/DC4/5 - Cap Bolts - Replacement","slug":"ad-dc4-5-cap-bolts-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52337,"registerId":"commonwealth-F2006B08848-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DC4/5 - Cap Bolts - Replacement","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/DC4/5 Cap Bolts - Replacement NK\n\nDocument: 1. Douglas Service August 1947; or\n\n \n\n2. FAA AD 49-38-2; or\n\n \n\n3. ANO 105.1.16.2.5.4.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\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, single-issue airworthiness directive focused specifically on cap bolt replacement for one aircraft type. It has not expanded beyond its original narrow safety purpose."},"complexity_factors":["Extremely short document (under 200 words)","Only 3 substantive requirements (the three reference documents)","No defined terms section","No conditional logic or exceptions","Single mechanical task (bolt replacement) with no alternatives or decision trees","References external technical documents rather than containing detailed instructions itself"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** for **Douglas DC-4 series aircraft** — a type of four-engine propeller plane that was common in the 1940s-1960s.\n\n**What it does:**\n- Requires the **replacement of cap bolts** on these aircraft.\n- \"Cap bolts\" are fasteners that hold parts together; if they fail, the aircraft could be unsafe.\n\n**Who it affects:**\n- Owners and operators of Douglas DC-4 aeroplanes still flying in Australia (mostly historical/vintage aircraft now).\n- Maintenance engineers who work on these planes.\n\n**Why it matters:**\n- Even old aircraft must meet current safety standards. This directive ensures a specific mechanical defect (faulty cap bolts) is fixed before the plane can fly.\n- It references older technical documents (a 1947 Douglas service bulletin, a 1949 US FAA directive, and an old Australian aviation order), showing it carries forward long-standing safety requirements.\n\n**How to comply:**\nOperators must follow one of three approved technical documents listed to replace the cap bolts properly."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The supplied text is a single AD entry (AD/DC4/5) that requires cap-bolt replacement and lists three documents as means of compliance. The extract contains no indication that the scope of the directive has been amended or changed from an earlier or original version, and it does not include any historical amendment notes. On the basis of the text provided, there is no evidence the scope has changed."},"complexity_factors":["Short on-face directive text that relies entirely on external technical documents (Douglas Service Aug 1947; FAA AD 49-38-2; ANO 105.1.16.2.5.4)","Regulatory enforcement context under Civil Aviation Regulations 1998, Part 39 - 105, which requires regulatory compliance but is not detailed in the supplied extract","Multiple alternative compliance references create choice but also require cross-checking between documents","One referenced document is dated (August 1947), which may raise interpretive or applicability questions when implementing older technical guidance","Lack of explicit procedural details (no on-face technical steps, no stated compliance timeline, no record-keeping or certification steps in the supplied text)"],"plain_english_summary":"This AD (AD/DC4/5) requires replacement of specified \"cap bolts\" on Douglas DC‑4 series aeroplanes, enforced by CASA under the Civil Aviation Regulations. It affects owners/operators who must follow one of three referenced documents (Douglas Service Aug 1947; FAA AD 49‑38‑2; ANO 105.1.16.2.5.4) to comply. Costs, downtime and maintenance responsibility fall to operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dc4-5-cap-bolts-replacement","history":"/api/acts/ad-dc4-5-cap-bolts-replacement/history","analysis":"/api/acts/ad-dc4-5-cap-bolts-replacement/analysis","conflicts":"/api/acts/ad-dc4-5-cap-bolts-replacement/conflicts","importantCases":"/api/acts/ad-dc4-5-cap-bolts-replacement/important-cases","documents":"/api/acts/ad-dc4-5-cap-bolts-replacement/documents"}}