{"id":"F2006B07086","name":"AD/SM-260/9A - Propeller Governor Arm - Inspection and Replacement","slug":"ad-sm-260-9a-propeller-governor-arm-inspection-and-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48848,"registerId":"commonwealth-F2006B07086-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SM-260/9A - Propeller Governor Arm - Inspection and Replacement","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 260 Series Aeroplanes\n\n \n\nAD/SM-260/9A Propeller Governor Arm - Inspection\n\nand Replacement\n\n\n11/77\n\n \n\nApplicability: Models F260 and F260B with S/Nos. 101 to 125, 2-26 to 2-75, 3-76 to 3-81, 3-84, 502 10-09, 20-01, 235, 237/... to 244/..., 247/... to 254/..., 266/... to 287/... which have\n\nnot been fitted with a steel propeller governor arm P/N 260-13-274-01 in accordance with para “b” of the requirement document.\n\n \n\nDocument: SIAI Marchetti SB No. 260B18A.\n\n \n\nCompliance: Inspect within 25 hours time in service after 31 January 1978 and thereafter at intervals not exceeding 50 hours time in service. Compliance with previous issues of this Directive satisfies compliance with this issue.\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 narrow, targeted safety directive addressing a specific mechanical defect in a specific aircraft type. The scope remains tightly focused on the original safety issue (propeller governor arm integrity) and has not expanded beyond this original purpose."},"complexity_factors":["Single, specific mechanical component addressed (propeller governor arm)","Clear applicability criteria using specific aircraft models and serial number ranges","Simple compliance timeline: initial inspection + recurring 50-hour intervals","Only one cross-reference (to manufacturer Service Bulletin 260B18A)","No nested exceptions or conditional logic — straightforward 'if not upgraded, then inspect' structure","Short document length (approximately 150 words of substantive content)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA) that mandates safety inspections and potential replacement of a specific aircraft part.\n\n**What it does:**\n- Requires owners/operators of certain SIAI Marchetti 260 series aeroplanes to inspect the **propeller governor arm** — a component that controls propeller blade pitch and engine speed.\n- If the aircraft hasn't already been upgraded with a specific steel replacement part (part number 260-13-274-01), it must be inspected regularly.\n\n**Who it affects:**\n- Owners and operators of specific SIAI Marchetti F260 and F260B aircraft with particular serial numbers (listed in the applicability section).\n\n**What must be done:**\n- **First inspection:** Within 25 hours of flight time after 31 January 1978\n- **Ongoing inspections:** Every 50 hours of flight time thereafter\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety orders. They typically issue when a manufacturer or regulator discovers a defect that could cause an accident. This directive suggests the original propeller governor arm design had a safety flaw requiring ongoing monitoring or replacement with a stronger steel version.\n\n**Key background:**\n- Based on **Service Bulletin 260B18A** from the manufacturer (SIAI Marchetti)\n- Compliance with earlier versions of this directive still counts as compliance"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This issue does not expand the Directive's scope: it retains the same inspection intervals and applicability limited to specified serial numbers not fitted with P/N 260-13-274-01, and expressly accepts compliance with earlier issues ('Compliance with previous issues of this Directive satisfies compliance with this issue') (Compliance; Applicability)."},"complexity_factors":["Narrow, serial-numbered applicability to specific F260/F260B airframes and only where steel arm P/N 260-13-274-01 has not been fitted (Applicability).","Requires action tied to an external manufacturer service bulletin (SIAI Marchetti SB No. 260B18A) rather than reproducing procedures in the Directive (Document).","Time-based compliance regime with an initial inspection deadline (25 hours after 31 Jan 1978) and recurring interval (every 50 hours), creating scheduling and logging obligations (Compliance).","References para “b” of the SB for the replacement part fitment path, creating dependency on that paragraph for complete compliance mechanics (Applicability).","Statement that compliance with earlier issues satisfies this issue reduces enforcement complexity but requires operators to track prior compliance history (Compliance).","Core requirements are short and prescriptive, but the Directive omits procedural detail (e.g. inspection criteria) which are contained in the referenced SB, increasing reliance on cross-document reading."],"plain_english_summary":"**What it does:** Requires owners/operators of specified SIAI Marchetti F260/F260B aeroplanes (particular serial numbers) that have NOT been fitted with steel propeller governor arm P/N 260-13-274-01 to inspect the propeller governor arm within 25 hours time-in-service after 31 January 1978 and then every 50 hours, using SIAI Marchetti SB No. 260B18A. \n\n**Why it matters:** The Directive aims to identify and fix a potential unsafe condition in the governor arm; operators bear the inspection and any replacement costs, while fitting the specified steel arm removes the recurring inspection requirement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sm-260-9a-propeller-governor-arm-inspection-and-replacement","history":"/api/acts/ad-sm-260-9a-propeller-governor-arm-inspection-and-replacement/history","analysis":"/api/acts/ad-sm-260-9a-propeller-governor-arm-inspection-and-replacement/analysis","conflicts":"/api/acts/ad-sm-260-9a-propeller-governor-arm-inspection-and-replacement/conflicts","importantCases":"/api/acts/ad-sm-260-9a-propeller-governor-arm-inspection-and-replacement/important-cases","documents":"/api/acts/ad-sm-260-9a-propeller-governor-arm-inspection-and-replacement/documents"}}