{"id":"F2006B10487","name":"AD/HS 125/48 - Radome Lightning Protection - Modification","slug":"ad-hs-125-48-radome-lightning-protection-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116237,"registerId":"commonwealth-F2006B10487-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/48 - Radome Lightning Protection - 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)  British Aerospace BAe 125 Series Aeroplanes\n\n \n\nAD/HS 125/48 Radome Lightning Protection - Modification 12/77\n\nApplicability: As detailed in the requirement document. Document: Hawker Siddeley SB No. 53-50.\n\nCompliance: Before 1 March 1978.\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":3,"scope_assessment":{"changed":false,"description":"The directive, as presented, requires a specific modification to radome lightning protection per Hawker Siddeley SB No. 53-50 and sets a compliance deadline (before 1 March 1978). The text contains no indication that the scope was altered from an earlier or original intent; applicability and technical scope are delegated to the referenced service bulletin, and the directive itself does not expand or narrow that scope within the supplied text. (See: \"Applicability: As detailed in the requirement document. Document: Hawker Siddeley SB No. 53-50.\" and \"Compliance: Before 1 March 1978.\")"},"complexity_factors":["Short, single-action directive with a clear compliance date (low intrinsic procedural complexity). (See: \"Compliance: Before 1 March 1978.\")","Technical requirements are delegated to an external service bulletin, requiring users to obtain and interpret that document (adds practical complexity). (See: \"Document: Hawker Siddeley SB No. 53-50.\")","Applicability is defined by reference rather than spelled out in the directive, creating an administrative step to identify affected aircraft. (See: \"Applicability: As detailed in the requirement document.\")","No allocation of costs, enforcement mechanisms, or exemption procedures stated in the supplied text, which increases uncertainty for implementers.","Fixed historical deadline creates scheduling pressure for operators but does not describe transitional relief in the text provided. (See: \"Compliance: Before 1 March 1978.\")"],"plain_english_summary":"This directive mandates a radome lightning‑protection modification for specified British Aerospace BAe 125 series aeroplanes, to be carried out in accordance with Hawker Siddeley Service Bulletin No. 53‑50. The work must be completed before 1 March 1978.\n\nIt matters because operators must obtain and follow the service bulletin, plan maintenance downtime to meet the fixed deadline, and confirm which aircraft are affected."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive from 1977 (as indicated by the '12/77' suffix and the 1978 compliance deadline). It addresses one specific safety concern (radome lightning protection) for one aircraft type. There is no evidence of scope creep; it remains tightly focused on its original safety purpose."},"complexity_factors":["Extremely short document (under 200 words)","No defined terms section — relies entirely on external reference document (Hawker Siddeley SB No. 53-50)","Single, unambiguous compliance deadline with no conditional logic or exceptions","No cross-references to other legislation beyond the enabling Civil Aviation Regulations 1998","Straightforward applicability clause referring to 'requirement document'","No nested provisions or subsections"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:**\nIt requires owners and operators of **British Aerospace BAe 125 series aircraft** to modify the **radome lightning protection** on their planes. The radome is the nose cone of an aircraft that houses radar equipment; lightning protection prevents damage from electrical strikes.\n\n**Who it affects:**\n- Owners and operators of BAe 125 series aircraft (a business jet)\n- Maintenance organisations servicing these aircraft\n\n**What must happen:**\n- Operators must follow the specific modification instructions in **Hawker Siddeley Service Bulletin No. 53-50**\n- The work must be completed **before 1 March 1978**\n\n**Why it matters:**\nWithout this modification, the aircraft's radome could be damaged by lightning strikes, potentially compromising radar function and flight safety. Airworthiness Directives are legally binding — failure to comply means the aircraft cannot legally fly."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-48-radome-lightning-protection-modification","history":"/api/acts/ad-hs-125-48-radome-lightning-protection-modification/history","analysis":"/api/acts/ad-hs-125-48-radome-lightning-protection-modification/analysis","conflicts":"/api/acts/ad-hs-125-48-radome-lightning-protection-modification/conflicts","importantCases":"/api/acts/ad-hs-125-48-radome-lightning-protection-modification/important-cases","documents":"/api/acts/ad-hs-125-48-radome-lightning-protection-modification/documents"}}