{"id":"F2005L02061","name":"AD/EMB-120/38 - Electrical Wiring","slug":"ad-emb-120-38-electrical-wiring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":36242,"registerId":"commonwealth-F2005L02061-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Embraer EMB-120 (Brasilia) Series Aeropl","sectionType":"division","heading":"Embraer EMB-120 (Brasilia) Series Aeroplanes","content":"### Embraer EMB-120 (Brasilia) Series Aeroplanes\n\n| AD/EMB-120/38 | Electrical Wiring | 9/2005 |\n| ------------- | ----------------- | ------ |\n\n| Applicability: | All EMB-120( ) aeroplanes.                                                                                                                                                                                                                                                                                                                                                                                                                                              |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Modify the fastening of the electrical wiring harnesses installed at the wing root (both LH and RH sides), alter the routing of the right outboard flap actuator harness and install anti-chaffing protection on those harnesses in accordance with the detailed instructions and procedures described in the Embraer Service Bulletin 120-24-0059, original issue, dated 6 April 2004, or later revisions approved by the Brazilian Centro Técnico Aeroespacial (CTA). |\n|                | Note: DAC Brazil AD 2005-06-01 refers.                                                                                                                                                                                                                                                                                                                                                                                                                                  |\n| Compliance:    | Within the next 5000 hours time in service after the effective date of this Directive.                                                                                                                                                                                                                                                                                                                                                                                  |\n|                | This Airworthiness Directive becomes effective on 1 September 2005.                                                                                                                                                                                                                                                                                                                                                                                                     |\n| Background:    | The actions required by his Directive are necessary to reduce the potential of ignition sources in the vicinity of the fuel tanks, which, in combination with flammable fuel vapours, could result in fuel tank explosions and consequent loss of the aeroplane.                                                                                                                                                                                                        |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n21 July 2005","sortOrder":0},{"sectionNumber":"AD/EMB-120/38","sectionType":"part","heading":"AD/EMB-120/38","content":"## AD/EMB-120/38","sortOrder":1},{"sectionNumber":"Electrical Wiring","sectionType":"part","heading":"Electrical Wiring","content":"## Electrical Wiring","sortOrder":2},{"sectionNumber":"9/2005","sectionType":"part","heading":"9/2005","content":"## 9/2005","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The Directive stays within its original airworthiness purpose: to reduce ignition sources near fuel tanks on EMB-120 aeroplanes. It does not broaden the regulatory scope beyond a targeted wiring modification, nor does it add new compliance pathways or extended applicability beyond all EMB-120 aeroplanes as stated (Applicability, Requirement, Background)."},"complexity_factors":["Single airframe type (EMB-120) — limited scope","One required action with three sub-tasks (fastening, rerouting, anti-chaffing)","Single external normative reference: Embraer Service Bulletin 120-24-0059 (with CTA approval for later revisions)","One clear compliance deadline: 5,000 flight hours from effective date","No nested exceptions, no multiple alternative compliance paths","Cross-reference to foreign authority (Brazilian CTA) but no multiple regulatory cross-references"],"plain_english_summary":"**What this instrument does (mechanically)**\n\n- Requires a physical modification to the electrical wiring in Embraer EMB-120 (Brasilia) series aeroplanes. Specifically, operators must:\n  - change how the electrical wiring harnesses are fastened at the wing root on both left-hand (LH) and right-hand (RH) sides,\n  - reroute the right outboard flap actuator harness, and\n  - install anti-chaffing (anti-abrasion) protection on those harnesses.\n- The work must be done exactly as described in Embraer Service Bulletin 120-24-0059 (original issue dated 6 April 2004) or any later revision that the Brazilian Centro Técnico Aeroespacial (CTA) approves. (Requirement)\n- Applies to all EMB-120 aeroplanes. (Applicability)\n- Must be completed within the next 5,000 flight hours after the Directive’s effective date (which is 1 September 2005). (Compliance)\n\n**Who is affected**\n\n- Aircraft operators/owners of Embraer EMB-120 series aeroplanes are directly affected because they must arrange and pay for the modification.\n- Maintenance organisations (MROs) and technicians who perform line and base maintenance will carry out the physical work and update maintenance records.\n- Regulators are indirectly affected because they may need to accept or record compliance and may rely on the Brazilian CTA approval for any later service bulletin revisions. (Requirement)\n\n**Why it matters (stated purpose and regulatory mechanism)**\n\n- The directive states the modification is necessary to reduce potential ignition sources near fuel tanks; the regulator’s stated safety concern is that wiring chafing or improperly restrained harnesses, in the presence of fuel vapour, could lead to ignition and fuel-tank explosions. (Background)\n\n**Practical effects and implementation mechanics**\n\n- Who pays: the aircraft operator pays for parts, labour and downtime.\n- How long/when: operators must schedule the work within 5,000 flight hours from the effective date; until completion, the aircraft remains subject to the existing risk but is still flyable unless other limitations apply. (Compliance)\n- How it is done: the operator must follow the Embraer service bulletin instructions; later revisions are acceptable only if CTA-approved, so there is a dependency on the manufacturer’s document and foreign authority approval. (Requirement)\n- Oversight: compliance is established by maintenance records showing the service bulletin action was performed on the aircraft.\n\n**Costs, incentives and trade-offs**\n\n- Direct costs: parts (fasteners, anti-chaffing materials), labour and aircraft downtime for each affected aircraft. These are paid by operators.\n- Incentives: operators have an incentive to comply within the 5,000-hour window to maintain airworthiness and avoid enforcement action; they may choose different MRO providers based on cost, availability and certification.\n- Opportunity cost: money and shop time spent on this mandated modification cannot be spent on other upgrades or maintenance during the same interval.\n- Implementation risk: the safety outcome depends on correct adherence to the service bulletin; incomplete or incorrect installation could leave the hazard unmitigated. Reliance on CTA approval for later revisions creates a regulatory dependency outside the local authority.\n- Competition effects: the Directive does not mandate a specific supplier or captive MRO; licensed independent MROs can perform the work subject to their approvals, so there is no explicit restriction on competition in maintenance services.\n\n**Compliance burden and record-keeping**\n\n- Operators must schedule the modification, allocate funds, obtain the service bulletin and any approved revisions, perform the work to the bulletin’s instructions, and update maintenance logs to demonstrate compliance.\n- The compliance timeframe (5,000 hours) is specific and creates a predictable short- to medium-term maintenance demand for parts and labour.\n\n**Concentrated benefits and costs**\n\n- Costs are concentrated on the affected EMB-120 operators and their chosen MROs.\n- Safety benefits (reduced ignition-source risk) accrue to individual aircraft, their operators, passengers and crew; those benefits are concentrated on those who operate and fly the aircraft rather than on unrelated parties.\n\n(Section references: Applicability, Requirement, Compliance, Background)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, targeted Airworthiness Directive addressing a specific wiring safety issue in a single aircraft type. The scope remains precisely focused on the original safety concern (preventing ignition sources near fuel tanks) without expansion into unrelated operational or maintenance areas."},"complexity_factors":["Single, specific aircraft type (Embraer EMB-120 series)","Clear, unambiguous compliance requirement referencing a single external technical document (Embraer Service Bulletin 120-24-0059)","Simple time-based compliance window (5,000 hours time in service)","No nested exceptions, conditional logic, or alternative compliance methods","Minimal defined terms (only standard aviation terminology like 'LH/RH' for left/right and 'time in service')","Straightforward applicability statement ('All EMB-120( ) aeroplanes')","Single regulatory action required with no sub-requirements or tiered obligations"],"plain_english_summary":"This CASA Airworthiness Directive requires owners and operators of Embraer EMB‑120 Brasilia aircraft in Australia to modify electrical wiring near the wing roots—secure harnesses, reroute the right outboard flap actuator harness, and add anti‑chafe protection—per Embraer Service Bulletin 120‑24‑0059 (6 Apr 2004 or later).  \n\nCompliance is mandatory within 5,000 flight hours from 1 Sept 2005 to eliminate ignition risks from chafed or misrouted wiring that could cause fuel‑tank explosions."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-emb-120-38-electrical-wiring","history":"/api/acts/ad-emb-120-38-electrical-wiring/history","analysis":"/api/acts/ad-emb-120-38-electrical-wiring/analysis","conflicts":"/api/acts/ad-emb-120-38-electrical-wiring/conflicts","importantCases":"/api/acts/ad-emb-120-38-electrical-wiring/important-cases","documents":"/api/acts/ad-emb-120-38-electrical-wiring/documents"}}