{"id":"F2006B04645","name":"AD/BELL 412/10 - Upper Anti-Collision Strobe Light P/No HR, DF-28DRMS Inspection, Modification and Replacement","slug":"ad-bell-412-10-upper-anti-collision-strobe-light-p-no-hr-df-28drms-inspection-modification-and-repla","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44397,"registerId":"commonwealth-F2006B04645-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 412/10 - Upper Anti-Collision Strobe Light P/No HR, DF-28DRMS Inspection, Modification and 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)  Bell Helicopter Textron 412 Series Helicopters\n\n \n\n# AD/BELL 412/10 Upper Anti-Collision Strobe Light P/No HR,\n\nDF-28DRMS Inspection, Modification and Replacement\n\nApplicability: All 412 models fitted with subject anti-collision strobe light.\n\n# 1/84\n\n \n\nRequirement: 1. Inspect upper anticollision strobe light per Bell Alert Service Bulletin No. 412-83- 14.\n\n \n\n2.    Modify upper anti-collision strobe light per Bell Alert Service Bulletin No. 412- 83-14.\n\n \n\n3.    Replace upper anti-collision strobe light with P/No. 70285-01 Assembly (Whelen).\n\n \n\nCompliance: For para 1. Before further flight after 24 November 1983 and thereafter at intervals not exceeding 25 hours time in service.\n\n \n\nFor para 2. Before 31 December 1983.\n\n \n\nFor para 3. Before 1 March 1983.\n\n \n\nBackground: Separation of the cup shaped lower portion of the light assembly which contains power supply components has occurred. These components have consequently contacted the main drive shaft resulting in minor damage. A potential problem exists in the retention of the entire light assembly, failure of which could cause similar damage.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\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":1557},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"Narrow technical safety directive focused on a single aircraft component. No evidence of scope expansion beyond the original safety imperative to prevent power supply components contacting the main drive shaft."},"complexity_factors":["Specific technical part numbers and aircraft model references","Multiple distinct compliance deadlines for different actions","External reference to manufacturer service bulletin (Bell Alert Service Bulletin No. 412-83-14)","Minimal conditional logic with straightforward applicability criteria"],"plain_english_summary":"This Airworthiness Directive mandates urgent safety fixes for Bell 412 helicopters equipped with a specific upper anti-collision strobe light (part numbers HR or DF-28DRMS).\n\n**The safety issue:** The cup-shaped lower portion of the light assembly (which holds power supply components) can separate from the unit. These loose components have already caused minor damage by contacting the main drive shaft, and complete failure of the light assembly retention could cause further serious damage.\n\n**What operators must do:**\n* **Inspect:** Check the light every 25 flight hours, starting immediately after 24 November 1983\n* **Modify:** Carry out modifications per Bell Alert Service Bulletin No. 412-83-14 before 31 December 1983  \n* **Replace:** Install a safer alternative part (Whelen assembly P/No. 70285-01) before 1 March 1983\n\nThis applies to all Bell 412 model helicopters fitted with the affected strobe lights."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-412-10-upper-anti-collision-strobe-light-p-no-hr-df-28drms-inspection-modification-and-repla","history":"/api/acts/ad-bell-412-10-upper-anti-collision-strobe-light-p-no-hr-df-28drms-inspection-modification-and-repla/history","analysis":"/api/acts/ad-bell-412-10-upper-anti-collision-strobe-light-p-no-hr-df-28drms-inspection-modification-and-repla/analysis","conflicts":"/api/acts/ad-bell-412-10-upper-anti-collision-strobe-light-p-no-hr-df-28drms-inspection-modification-and-repla/conflicts","importantCases":"/api/acts/ad-bell-412-10-upper-anti-collision-strobe-light-p-no-hr-df-28drms-inspection-modification-and-repla/important-cases","documents":"/api/acts/ad-bell-412-10-upper-anti-collision-strobe-light-p-no-hr-df-28drms-inspection-modification-and-repla/documents"}}