{"id":"F2006B02524","name":"AD/AS 355/74 - Camera System Installation","slug":"ad-as-355-74-camera-system-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41780,"registerId":"commonwealth-F2006B02524-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)  \n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)  \n\nEurocopter AS 355 (Twin Ecureuil) Series Helicopters","sortOrder":0},{"sectionNumber":"AD/AS 355/74 Camera System Installation ","sectionType":"part","heading":"AD/AS 355/74 Camera System Installation 12/2003","content":"# AD/AS 355/74 Camera System Installation 12/2003\n\nDM\n\nApplicability: Model AS 355 helicopters that have been modified in accordance with Mann Aviation Group (Engineering) Ltd (MAG(E)) modification 350-1521 or 350-1680; Installation of Camera platform.\n\nRequirement: 1. Inspect helicopters which have MAG(E) modification 350-1521 or 350-1680 installed for continued short term acceptability in accordance with paragraph 2A of MAG(E) SB-A25-001. Platform panels bearing part number 350-1521-103, which do not have the specified clearance, must be removed from service immediately.\n\n    2. Panels with part number 350-1521-103 held in store or those which have been removed in accordance with Requirement 1 must be modified in accordance with the Instructions specified in paragraph 2 of MAG(E) SB-A25-001.\n\n    3. For panels inspected in accordance with Requirement 1 that have remained installed, modify panel part number 350-1521-103 in accordance with the Instructions specified in paragraph 2 of MAG(E) SB-A25-001.\n\nNote: UK CAA AD G-2003-0008 refers.\n\nCompliance: 1. Before further flight after 1 October 2003.\n\n    2. Before next installation or within 30 days after 1 October 2003, whichever occurs first.\n\n    3. Within 30 days after 1 October 2003.\n\nThis Airworthiness Directive becomes effective on 1 October 2003.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD remains narrowly tailored to correct an unsafe condition attributable to a specific camera-platform modification (MAG(E) 350-1521 / 350-1680) and a specific panel part number (350-1521-103). It does not expand beyond that original safety-focused purpose: it mandates inspection and modification or removal of non-compliant panels within short, specified timeframes and points to the MAG(E) service bulletin for technical details. There is no evidence in the text that the directive broadens scope beyond addressing that particular installation and the associated unsafe condition."},"complexity_factors":["Single helicopter type and two specific modification numbers (AS 355 with MAG(E) mod 350-1521 or 350-1680) — narrow applicability","Three straightforward mandatory actions (inspect, modify stored/removed panels, modify installed panels)","Single critical part referenced (panel part number 350-1521-103)","Compliance times are short and simple but differ across Requirements (before next flight; within 30 days; before next installation or within 30 days)","Key technical definitions and modification instructions are contained in an external document (MAG(E) SB-A25-001), creating a cross-reference dependency","Short note cross-referencing UK CAA AD G-2003-0008 (one external regulatory reference)"],"plain_english_summary":"**What this directive does (mechanically):**\n\n- It orders owners/operators of Eurocopter AS 355 helicopters that have been modified with Mann Aviation Group (Engineering) Ltd (MAG(E)) modification 350-1521 or 350-1680 (the camera platform installation) to inspect and, where necessary, modify or remove a specific platform panel (part number 350-1521-103). (See \"Applicability\" and \"Requirement\".)\n\n**Who is affected:**\n\n- Operators and maintainers of AS 355 (Twin Ecureuil) helicopters that have the MAG(E) 350-1521 or 350-1680 camera-platform modification installed, and organisations holding spare panels of part number 350-1521-103. (Applicability.)\n\n**What the directive requires and how it must be done:**\n\n- Requirement 1: Inspect installed helicopter panels (part no. 350-1521-103) for the required clearance as described in paragraph 2A of MAG(E) Service Bulletin SB-A25-001. If a panel does not have the specified clearance, it must be taken out of service immediately. (Requirement 1)\n\n- Requirement 2: Panels of part no. 350-1521-103 that are in store or have already been removed must be modified in accordance with the instructions in paragraph 2 of MAG(E) SB-A25-001 before they are used again. (Requirement 2)\n\n- Requirement 3: Panels that remained installed after the inspection must be modified in accordance with paragraph 2 of MAG(E) SB-A25-001. (Requirement 3)\n\n- The directive refers to the UK CAA Airworthiness Directive G-2003-0008 as related authority/information. (Note)\n\n**Timing (compliance deadlines):**\n\n- Inspection: before further flight after 1 October 2003. (Compliance 1)\n- Stored or removed panels: modify before next installation or within 30 days after 1 October 2003, whichever comes first. (Compliance 2)\n- Installed panels that passed initial inspection: modify within 30 days after 1 October 2003. (Compliance 3)\n\n**Why this matters (stated purpose and how it operates in practice):**\n\n- Stated purpose: the CASA delegate issued this AD under CASR subregulation 39.1(1) to correct an identified unsafe condition arising from the camera-platform installation. The rule mechanically forces inspections and mandated modification/removal of panels that do not meet the clearance standard set out in MAG(E) SB-A25-001. (Preamble; Requirement; Compliance.)\n\n- Costs and incentives: the immediate costs fall on affected aircraft operators and maintenance organisations. They must perform the inspection before flight (potentially causing grounding/downtime), modify or remove non-compliant panels, and alter stored spares before next use. The service bulletin provides the technical instructions; compliance requires either in-house capability or contracting an approved maintenance provider. (Requirement 1–3; Compliance.)\n\n- Trade-offs and opportunity costs: complying removes an identified safety risk but imposes labour, parts-modification and aircraft availability costs on a limited set of operators. Operators can avoid future compliance costs by not installing the camera platform, but that changes the aircraft capability and commercial value. The directive concentrates costs on operators who installed the MAG(E) modification; costs are diffuse across those specific operators rather than across all AS 355 owners. (Applicability; Requirements.)\n\n- Implementation risk and compliance burden: the AD depends on an external technical document (MAG(E) SB-A25-001) for the definition of the required clearance and the modification instructions. That creates a dependency on the availability and clarity of that service bulletin. The CASA delegate enforces the compliance deadlines; decisions about how and where to perform the modification remain with operators and approved maintenance organisations. (Requirement; Note.)\n\n**Who pays, who decides, and what behaviour changes:**\n\n- Who pays: affected operators and owners of the specific panels (350-1521-103) pay for inspections, modifications, parts replacement or removal, and any aircraft downtime. (Requirements; Compliance.)\n\n- Who decides: CASA (via the delegate) has imposed the directive under CASR 39.1(1); maintenance organisations and operators decide how to implement the required inspections and modifications, but must follow the MAG(E) service bulletin instructions. (Preamble; Requirements.)\n\n- Behaviour changes required: operators must inspect certain camera-platform panels, remove non-compliant panels from service, and modify remaining or stored panels per the service bulletin. This changes maintenance priorities and scheduling for affected helicopters. (Requirements; Compliance.)\n\n**Concrete mechanism of enforcement:**\n\n- The AD sets mandatory inspection/modification actions and fixed compliance windows. CASA may enforce through its usual regulatory oversight of airworthiness and maintenance compliance. (Preamble; Compliance.)\n\nNote: The directive is narrowly targeted to a specific modification and part number and relies on MAG(E) SB-A25-001 for the technical definition of non-compliance and the corrective modification. (Applicability; Requirements.)"},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope — addressing a specific unsafe condition in specific helicopter models with specific camera platform modifications. There is no evidence of scope creep; the directive targets exactly the safety issue identified (clearance problems with part number 350-1521-103 panels) without expanding into unrelated operational or maintenance requirements."},"complexity_factors":["Multiple cross-references to external technical documents (MAG(E) SB-A25-001, UK CAA AD G-2003-0008) without reproducing their content","Three distinct requirements with different compliance timelines and conditions","Specific part numbers and modification numbers that require technical familiarity","Conditional logic ('whichever occurs first') in Compliance section 2","Nested applicability criteria (specific helicopter model + specific modifications)"],"plain_english_summary":"This safety order applies to Eurocopter AS355 helicopters fitted with Mann Aviation camera platforms (mods 350-1521 or 350-1680). It requires owners/operators to inspect panels P/N 350-1521-103 for proper clearance and to remove any noncompliant panels before further flight.\n\nRemoved or stored panels must be modified before reuse, and any panels remaining installed must be modified within 30 days. Compliance is mandatory to address a potentially unsafe design flaw."}},"importantCases":[],"_links":{"self":"/api/acts/ad-as-355-74-camera-system-installation","history":"/api/acts/ad-as-355-74-camera-system-installation/history","analysis":"/api/acts/ad-as-355-74-camera-system-installation/analysis","conflicts":"/api/acts/ad-as-355-74-camera-system-installation/conflicts","importantCases":"/api/acts/ad-as-355-74-camera-system-installation/important-cases","documents":"/api/acts/ad-as-355-74-camera-system-installation/documents"}}