{"id":"F2006B07031","name":"AD/SM-205/1 - Propeller Control Strut - Installation","slug":"ad-sm-205-1-propeller-control-strut-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48731,"registerId":"commonwealth-F2006B07031-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SM-205/1 - Propeller Control Strut - 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-205/1 Propeller Control Strut - Installation 9/70\n\nApplicability: Model S205-22R with S/Nos. 001 to 5-303.\n\n \n\nDocument: SIAI Marchetti SB 205B22B dated 19 November 1970. Compliance: Before issue of Certificate of Airworthiness.\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\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text of the directive presents a single, focused requirement (install the propeller control strut per the referenced service bulletin for specified serial numbers before issue of a Certificate of Airworthiness). The instrument does not indicate any alteration to that scope within the text, and provides no material suggesting the scope has changed from an earlier or different intent."},"complexity_factors":["Narrow applicability limited to a single model and specific serial-number range (reduces breadth of compliance). (See: \"Applicability: Model S205-22R with S/Nos. 001 to 5-303\")","Mandatory pre-certification timing: compliance must be completed before issue of a Certificate of Airworthiness, which ties the action to the regulator's certification timeline. (See: \"Compliance: Before issue of Certificate of Airworthiness\")","Reliance on an external manufacturer service bulletin (SIAI Marchetti SB 205B22B) for the technical procedure, which requires holders to obtain and follow a separate document. (See: \"Document: SIAI Marchetti SB 205B22B dated 19 November 1970\")","Lack of procedural detail in the AD itself (installation steps, tests, record-keeping requirements not included), increasing operational reliance on the service bulletin. (See: absence of technical detail in the AD text)","Absence of explicit assignment of responsibility or cost in the AD text, creating potential for operational or contractual ambiguity between manufacturer, production organisation and owner. (See: no party named for performance/payment combined with the compliance timing requirement)"],"plain_english_summary":"This directive requires installation of a propeller control strut on SIAI Marchetti Model S205-22R aircraft (S/N 001–5-303), performed per SIAI Marchetti SB 205B22B (19 Nov 1970) and completed before issuance of a Certificate of Airworthiness. The AD prescribes the action and references the service bulletin but gives no technical detail, explicit safety rationale, or allocation of who must perform or pay for the work."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive from 1970. It has not expanded beyond its original narrow purpose of mandating a specific hardware modification to a limited subset of aircraft. The scope remains tightly constrained to the original safety issue."},"complexity_factors":["Extremely short document (approximately 100 words of substantive content)","Only one defined applicability criterion (specific model and serial number range)","Single compliance requirement with clear deadline (before Certificate of Airworthiness issuance)","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","No conditional logic, exceptions, or nested provisions","References external technical document (Service Bulletin) rather than embedding complex technical specifications"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires a specific fix to be made to certain SIAI Marchetti aeroplanes before they can be legally flown.\n\n**What it does:**\n- Requires the installation of a \"propeller control strut\" (a mechanical component that helps control the propeller) on specific aircraft\n- Applies only to **Model S205-22R** aircraft with serial numbers **001 through 5-303**\n\n**Who it affects:**\n- Owners and operators of these specific Italian-made light aircraft\n- Anyone seeking to obtain a **Certificate of Airworthiness** (the official document that says an aircraft is safe to fly) for one of these planes\n\n**Why it matters:**\n- This is a **pre-flight requirement** — you cannot legally get your aircraft certified as airworthy until this modification is done\n- The directive references a manufacturer's **Service Bulletin** (SB 205B22B) from November 1970, which contains the technical instructions for the fix\n- Airworthiness Directives exist to prevent accidents; this particular one addresses a specific safety issue with the propeller control system on these aircraft"}},"importantCases":[],"_links":{"self":"/api/acts/ad-sm-205-1-propeller-control-strut-installation","history":"/api/acts/ad-sm-205-1-propeller-control-strut-installation/history","analysis":"/api/acts/ad-sm-205-1-propeller-control-strut-installation/analysis","conflicts":"/api/acts/ad-sm-205-1-propeller-control-strut-installation/conflicts","importantCases":"/api/acts/ad-sm-205-1-propeller-control-strut-installation/important-cases","documents":"/api/acts/ad-sm-205-1-propeller-control-strut-installation/documents"}}