{"id":"F2006B09457","name":"AD/EMB-110/17 - Fire Detector Bracket Assembly P/N 4A-513-21-02 - Modification","slug":"ad-emb-110-17-fire-detector-bracket-assembly-p-n-4a-513-21-02-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53912,"registerId":"commonwealth-F2006B09457-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/EMB-110/17 - Fire Detector Bracket Assembly P/N 4A-513-21-02 - 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)  Embraer EMB-110 (Bandeirante) Series Aeroplanes\n\n \n\n# AD/EMB-110/17 Fire Detector Bracket Assembly P/N 4A-513-21-02 - Modification\n\nApplicability: All models EMB-110 with S/Nos. referenced in Embraer SB No. 110-26-003. Document:               1. Embraer SB No. 110-26-003; or\n\n2. CTA AD No. 82-02-02.\n\n \n\nCompliance: Within 250 hours time in service after 30 September, 1982.\n\n# 5/82\n\n \n\nBackground:  Damage to the fire detector installation may occur during removal and/or installation of the engine upper cowling.\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, original airworthiness directive from 1982 addressing a specific mechanical defect. It has not expanded beyond its original narrow scope of requiring a single bracket modification on specific aircraft."},"complexity_factors":["Single, specific technical requirement (one bracket modification)","Only 2 defined reference documents (Embraer SB and CTA AD)","Simple applicability test (specific aircraft serial numbers)","Clear compliance deadline (250 hours after fixed date)","No nested exceptions, conditional logic, or cross-references to other legislation","Extremely short document (approximately 150 words of substantive content)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\nRequires owners and operators of specific **Embraer EMB-110 Bandeirante aircraft** to modify a fire detector bracket assembly (part number 4A-513-21-02). The modification prevents damage to the fire detector when mechanics remove or install the engine's upper cowling.\n\n**Who it affects:**\n- Owners and operators of EMB-110 aircraft with specific serial numbers listed in Embraer Service Bulletin No. 110-26-003\n- Maintenance organisations servicing these aircraft\n\n**Why it matters:**\nFire detectors are critical safety equipment. If damaged during routine maintenance, they might fail to detect an engine fire — a potentially catastrophic situation. This directive closes a design flaw that made the detectors vulnerable to accidental damage during normal cowling removal.\n\n**What must be done:**\nThe modification must be completed within **250 flight hours** after 30 September 1982, following the procedures in either:\n- Embraer Service Bulletin 110-26-003, or  \n- CTA Airworthiness Directive 82-02-02 (an earlier Brazilian aviation safety notice)\n\n**Key point:** This is not optional. Airworthiness Directives are legally binding — aircraft cannot legally fly until the required action is completed."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive's scope, as expressed, is limited to EMB-110 aeroplanes whose serial numbers are referenced in Embraer SB No. 110-26-003 and requires a specific modification to the fire detector bracket assembly. The stated background — that damage may occur during removal/installation of the engine upper cowling — aligns with the modification requirement. There is no information in the provided text indicating a change in scope from that stated intent (Applicability; Background; Document; Compliance)."},"complexity_factors":["Narrow technical scope: applies only to EMB-110 aircraft with serial numbers listed in Embraer SB No. 110-26-003 (Applicability).","Mandated external technical references: compliance requires following Embraer SB No. 110-26-003 or CTA AD No. 82-02-02 rather than steps in the directive itself (Document).","Fixed and near-term compliance window: a single, explicit deadline — within 250 hours time in service after 30 September 1982 — limits scheduling flexibility (Compliance).","Regulatory origin and enforceability: issued under Civil Aviation Regulations 1998 Part 39 by the Civil Aviation Safety Authority, creating a legal compliance obligation (header)."],"plain_english_summary":"### What this directive does\n\nThis Airworthiness Directive requires a modification to the fire detector bracket assembly (part number 4A-513-21-02) on certain Embraer EMB-110 (Bandeirante) aeroplanes. It directs operators to carry out the modification using the technical instructions specified in an Embraer Service Bulletin or an equivalent Civil Aviation Technical Authority (CTA) Airworthiness Directive.\n\n### Who is affected\n\n- Aircraft covered: All EMB-110 models with the serial numbers listed in Embraer Service Bulletin No. 110-26-003 (Applicability).\n- Decision-maker: The directive is issued under the Civil Aviation Regulations 1998, Part 39, by the Civil Aviation Safety Authority (header). Operators of the affected aircraft must comply.\n\n### What must be done and by when\n\n- Follow the modification instructions in either Embraer SB No. 110-26-003 or CTA AD No. 82-02-02 (Document).\n- Complete the required modification within 250 hours time in service after 30 September 1982 (Compliance).\n\n### Why the change is required (stated reason)\n\n- The directive states its background reason as: damage to the fire detector installation may occur during removal and/or installation of the engine upper cowling (Background).\n\n### Practical mechanics, incentives and burdens (source-linked)\n\n- Who pays and arranges the work: The operator or owner of each affected aircraft must arrange for and fund the modification because the directive imposes a compliance action on those aircraft (Applicability; Compliance).\n- How the work must be done: The modification must be performed according to the specified Embraer service bulletin or the CTA AD (Document). That places a reliance on external technical documentation for the exact procedures and parts.\n- Compliance timing and operational cost: The 250-hours‑time‑in‑service deadline forces scheduling of maintenance within a finite window, which creates downtime and resource allocation costs for operators (Compliance).\n- Implementation risk and discretion: The regulatory text requires use of the referenced documents but does not itself set out the technical steps; implementation therefore depends on the content and availability of Embraer SB No. 110-26-003 or CTA AD No. 82-02-02 (Document). The issuing authority is the Civil Aviation Safety Authority under Part 39 (header), which determines the directive’s legal requirement.\n\n### Trade-offs and opportunity costs (as supported by the directive)\n\n- The directive’s stated aim (preventing damage to the fire detector installation during cowling removal/installation) is achieved by mandating a modification, but achieving that requires operators to incur the direct costs of the work, schedule downtime, and rely on the referenced technical documents (Background; Document; Compliance).\n\nFor reference to original text: see the directive header (Civil Aviation Regulations 1998, PART 39 - 105), the Applicability, Document, Compliance and Background sections of AD/EMB-110/17."}},"importantCases":[],"_links":{"self":"/api/acts/ad-emb-110-17-fire-detector-bracket-assembly-p-n-4a-513-21-02-modification","history":"/api/acts/ad-emb-110-17-fire-detector-bracket-assembly-p-n-4a-513-21-02-modification/history","analysis":"/api/acts/ad-emb-110-17-fire-detector-bracket-assembly-p-n-4a-513-21-02-modification/analysis","conflicts":"/api/acts/ad-emb-110-17-fire-detector-bracket-assembly-p-n-4a-513-21-02-modification/conflicts","importantCases":"/api/acts/ad-emb-110-17-fire-detector-bracket-assembly-p-n-4a-513-21-02-modification/important-cases","documents":"/api/acts/ad-emb-110-17-fire-detector-bracket-assembly-p-n-4a-513-21-02-modification/documents"}}