{"id":"F2006B09526","name":"AD/EMB-120/9 - Emergency Lighting","slug":"ad-emb-120-9-emergency-lighting","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54127,"registerId":"commonwealth-F2006B09526-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/EMB-120/9 - Emergency Lighting","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)  Embraer EMB-120 (Brasilia) Series Aeroplanes\n\n \n\nAD/EMB-120/9 Emergency Lighting 9/93\n\nApplicability: EMB 120 aircraft serial numbers 120004 and 120006 through 120727 inclusive,\n\nexcept 120181 and 120208.\n\n \n\nRequirement: Modify the emergency lighting system in accordance with Embraer Service Bulletin 120-33-0033 dated 15 December 1992.\n\n \n\nNote: CTA (Brazil) AD 93-03-01 Amdt 39-712 dated 10 April 1993 refers.\n\n \n\nCompliance: Prior to 1 December 1993.\n\n \n\nBackground:  Compliance with this Directive corrects a deficiency in automatic activation of the emergency lighting system.\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":2,"scope_assessment":{"changed":false,"description":"The Schedule of Airworthiness Directives sets a targeted requirement for modification of the emergency lighting system on specified EMB-120 serial-numbered aircraft and a deadline for completion. The text contains no material indicating a change from an earlier stated scope; it prescribes the same narrow corrective action described as the directive's purpose (Requirement; Applicability; Compliance; Background)."},"complexity_factors":["Narrow and specific applicability to a defined range of serial numbers with two explicit exceptions (Applicability).","Single, prescriptive technical remedy referenced by a single manufacturer service bulletin (Requirement).","Clear, single compliance deadline (Compliance).","No alternative compliance pathways or multiple interdependent provisions in the text.","Limited cross-references — only a note citing a related foreign AD (Note)."],"plain_english_summary":"What this instrument does (mechanical change)\n\n- This airworthiness directive requires specific Embraer EMB-120 aeroplanes to have their emergency lighting system modified in accordance with Embraer Service Bulletin 120-33-0033 dated 15 December 1992. (Requirement)\n- The modification must be carried out on aircraft with serial numbers 120004 and 120006 through 120727 inclusive, except serial numbers 120181 and 120208. (Applicability)\n- The work must be completed prior to 1 December 1993. (Compliance)\n\nWhy the change is required (official rationale and testing it against practical effects)\n\n- The directive states its purpose is to \"correct a deficiency in automatic activation of the emergency lighting system.\" (Background). That is the stated safety problem the modification is meant to fix.\n\nWho pays and who decides\n\n- Aircraft operators or owners of the listed EMB-120 serial numbers must arrange and pay for the modification called for by the Service Bulletin. (Requirement; Applicability)\n- The directive prescribes a specific technical procedure (the Embraer Service Bulletin) that must be followed, leaving little room for alternative technical solutions. (Requirement)\n\nCompliance burden, timing and operational effects\n\n- The immediate compliance cost is the direct expense of performing the modification and any associated parts and labour. (Requirement)\n- Operators must schedule the work before the stated deadline, which creates an opportunity cost from aircraft downtime while the modification is performed. (Compliance)\n- The AD does not describe enforcement steps or penalties within its text. It simply sets the requirement and deadline. (Compliance)\n\nImplementation risk and discretion\n\n- The directive ties compliance to a manufacturer service bulletin; practical implementation risk depends on correct application of that bulletin by the maintenance organisation. (Requirement)\n- The AD itself is prescriptive; it delegates the technical details to the Embraer Service Bulletin rather than leaving discretionary options in the AD. (Requirement)\n\nEffects on market participants and competition\n\n- The need for modifications will create demand for maintenance work on the affected serial-numbered aircraft. Independent maintenance operators who are authorised to perform the Service Bulletin work can compete to provide that service. (Requirement)\n- The AD constrains operators’ technical freedom by mandating the Service Bulletin procedure; it does not specify alternative compliance options in the text. (Requirement)\n\nInteractions with other authorities\n\n- The AD notes a corresponding Brazilian authority AD (CTA (Brazil) AD 93-03-01 Amdt 39-712 dated 10 April 1993), indicating coordination or parallel action with the type certificate authority in the aircraft’s state of manufacture. (Note)\n\nTrade-offs and opportunity costs (source-grounded)\n\n- Benefit claimed: restore reliable automatic activation of emergency lighting (Background).\n- Costs and trade-offs stated or implied by the directive: operators must fund and schedule the modification, accept aircraft downtime, and ensure the Service Bulletin is applied correctly. (Requirement; Compliance)\n\nNet practical effect (plain statement)\n\n- A defined set of EMB-120 aircraft must be modified by a set date using a specified manufacturer procedure to address an identified deficiency in emergency lighting automatic activation. The financial and operational burden falls on the aircraft owners/operators, and the AD prescribes the technical route for compliance. (Applicability; Requirement; Compliance; Background)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive with a narrow, specific purpose (fixing emergency lighting on particular aircraft). It has not expanded beyond its original technical safety intent."},"complexity_factors":["Very short document (under 200 words)","Only 4 operative provisions: applicability, requirement, note, and compliance","Single cross-reference to a Brazilian aviation directive and one manufacturer service bulletin","No defined terms section — uses plain serial numbers and dates","No conditional logic or nested exceptions — just a straightforward applicability list with two exclusions"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\nOrders owners and operators of certain Embraer EMB-120 \"Brasilia\" aircraft to modify their emergency lighting systems. The fix must follow a specific technical instruction from the manufacturer (Embraer Service Bulletin 120-33-0033).\n\n**Who it affects:**\nAnyone who owns or operates EMB-120 aircraft with serial numbers 120004 and 120006 through 120727 — **except** two specific planes (serial numbers 120181 and 120208).\n\n**Why it matters:**\nThe aircraft have a safety flaw: the emergency lighting system might not turn on automatically when needed. Emergency lighting is critical for passenger evacuation during accidents or emergencies. This directive fixes that defect to protect passengers and crew.\n\n**Key deadlines:**\nThe modification had to be completed before 1 December 1993.\n\n**International link:**\nThis mirrors a Brazilian aviation safety order (CTA AD 93-03-01), showing how aviation safety standards are coordinated across countries."}},"importantCases":[],"_links":{"self":"/api/acts/ad-emb-120-9-emergency-lighting","history":"/api/acts/ad-emb-120-9-emergency-lighting/history","analysis":"/api/acts/ad-emb-120-9-emergency-lighting/analysis","conflicts":"/api/acts/ad-emb-120-9-emergency-lighting/conflicts","importantCases":"/api/acts/ad-emb-120-9-emergency-lighting/important-cases","documents":"/api/acts/ad-emb-120-9-emergency-lighting/documents"}}