{"id":"F2006B07034","name":"AD/SM-205/12 - Main Landing Gear Switches - Installation","slug":"ad-sm-205-12-main-landing-gear-switches-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48740,"registerId":"commonwealth-F2006B07034-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SM-205/12 - Main Landing Gear Switches - Installation","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)  SIAI Marchetti S205 and S208 Series Aeroplanes\n\n \n\nAD/SM-205/12 Main Landing Gear Switches - Installation 3/71\n\nApplicability: Models S-205/18/R, S205-20/R and S205-22/R with S/Nos. 106, 212, 213, 214, 220,\n\n221, 227, 230, 233, 239, 345, 346, 347, 349, 353, 354, 355, 356, 359, 360, 361, 362,\n\n364, 366, 367, 369, 370, 371, 372, 373, 374, 375, 376, 379, 380, 381, 382, 384, 399\n\nand 003.\n\n \n\nDocument:  SIAI Marchetti SB 205B5A. Compliance: Before 31 March 1971.\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":{"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 scope. It addresses a single technical issue (landing gear switches) for a limited fleet of aircraft. There is no indication of scope creep; the directive remains tightly focused on its original safety purpose."},"complexity_factors":["Very short document (approximately 150 words)","Only 3 defined applicability criteria (aircraft models, serial numbers, and manufacturer service bulletin reference)","Single compliance requirement with clear deadline","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","No conditional logic or exceptions","Straightforward command structure: identify if applicable → comply by date"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires specific owners of SIAI Marchetti S205 series aircraft to install new main landing gear switches.\n\n**Who it affects:**\n- Owners and operators of specific SIAI Marchetti S205 aircraft models (S-205/18/R, S205-20/R, and S205-22/R)\n- Only applies to aircraft with specific serial numbers listed (106, 212, 213, and 39 others)\n\n**What it requires:**\n- Install modified main landing gear switches as specified in the manufacturer's Service Bulletin 205B5A\n- Must be completed before 31 March 1971\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety instructions. If you own one of these specific aircraft, you **must** comply or the aircraft cannot legally fly. This particular directive addresses a safety issue with the main landing gear switches — likely a defect that could affect landing gear operation or indication systems."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument, as presented, sets a targeted requirement: install main landing gear switches on a fixed list of aircraft by a fixed past compliance date, using the named service bulletin. There is no text in the supplied document indicating an expansion or narrowing of scope from an earlier or different intent. The scope is therefore unchanged within the supplied text: it applies only to the listed models/serial numbers, and compliance is defined solely by reference to SB 205B5A and the 31 March 1971 deadline."},"complexity_factors":["Narrow technical scope limited to installation of a single component type (main landing gear switches).","Clear, short applicability limited to specified models and serial numbers, reducing interpretive ambiguity.","Delegation of technical detail to an external manufacturer service bulletin (SB 205B5A), meaning the AD itself is procedurally simple but requires consulting another document for implementation.","Definite compliance deadline with no alternatives or conditional provisions increases administrative clarity but requires timely action.","Minimal procedural text: the AD does not set out certification, enforcement, or exception rules, which simplifies the AD but shifts detail to other regulatory practice or documents."],"plain_english_summary":"This directive mandates installation of main landing‑gear switches on specified SIAI Marchetti S‑205/18/R, S205‑20/R and S205‑22/R aircraft listed by serial number, using SIAI Marchetti Service Bulletin SB 205B5A. Compliance is required by 31 March 1971.\n\nIt affects the listed aircraft owners/operators (who pay and arrange the work) and the maintenance organisations or technicians who must carry out the installation per the service bulletin."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sm-205-12-main-landing-gear-switches-installation","history":"/api/acts/ad-sm-205-12-main-landing-gear-switches-installation/history","analysis":"/api/acts/ad-sm-205-12-main-landing-gear-switches-installation/analysis","conflicts":"/api/acts/ad-sm-205-12-main-landing-gear-switches-installation/conflicts","importantCases":"/api/acts/ad-sm-205-12-main-landing-gear-switches-installation/important-cases","documents":"/api/acts/ad-sm-205-12-main-landing-gear-switches-installation/documents"}}