{"id":"F2006B07073","name":"AD/SM-260/14 Amdt 1 - Governor Relief Valve Spring - Inspection","slug":"ad-sm-260-14-amdt-1-governor-relief-valve-spring-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48830,"registerId":"commonwealth-F2006B07073-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SM-260/14 Amdt 1 - Governor Relief Valve Spring - Inspection","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nSIAI Marchetti 260 Series Aeroplanes\n\nAD/SM-260/14\n\nAmdt 1\n\n  \nGovernor Relief Valve Spring \\- Inspection 9/83\n\nApplicability: All SIAI-Marchetti F260, F260B and F260C models equipped with the following propeller governors;\n\n| HARTZELL                 | SIAI EQUIVALENT |\n| ------------------------ | --------------- |\n| F4-4A                    | 260-13-272-01   |\n| F4-4A (Reset into FA-11) | 260-23-272-05   |\n| F4-112                   | 260-13-272-03   |\n| F6-15A                   | 260-13-272-07   |\n| F4-4A                    | 260-13-272-09   |\n\nDocument: SIAI Marchetti Service Bulletin 260 B35.\n\nNote: FAA AD 83-06-10 refers.\n\nCompliance: For those governors with a relief valve body which has a rectangular port, by 31 July 1983 and every maintenance release inspection thereafter. For those governors with a relief valve body which has a round port, by 31st July 1983 and every 500 hours time in service thereafter.\n\nBackground: 1. The manufacturer advises instances of spring P/No. A3107 breakage. Breakage of this spring can cause lowering of governor oil pressure and a harmful “overspeed” of the propeller.\n\n2. This AD has been reprinted to correct a typographical error under applicability for Hartzell FA-112, SIAI equivalent should read 260-13-272-03.","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 amendment only corrects a typographical error in part numbering and does not expand the scope beyond the original safety concern."},"complexity_factors":["Very short document (under 300 words)","Only 2 defined compliance categories based on physical port shape (rectangular vs round)","Single technical cross-reference to FAA AD 83-06-10 and one manufacturer service bulletin","No nested exceptions or conditional logic beyond the port-shape distinction","Limited applicability: only 3 aircraft models and 5 specific governor part numbers","Straightforward compliance dates with simple recurring intervals"],"plain_english_summary":"This CASA Airworthiness Directive requires owners of SIAI-Marchetti F260/F260B/F260C aeroplanes fitted with the listed Hartzell or SIAI-equivalent propeller governors to inspect the governor relief valve spring (P/N A3107). The spring can break, causing oil-pressure loss and possible propeller overspeed—an unsafe condition.\n\nInspections must be done by 31 July 1983, then at specified intervals based on governor port shape (rectangular at each maintenance release; round every 500 flight hours). Amendment 1 corrects a SIAI part-number typo."},"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The reprint corrects a typographical error in the applicability for a Hartzell model number but does not change the AD’s substantive scope or the required inspections (Background 2)."},"complexity_factors":["Technical specificity: identifies particular governor models and SIAI part numbers (Applicability).","Conditional compliance intervals: inspection timing depends on relief‑valve port shape (Compliance).","External references: requires following SIAI Service Bulletin 260 B35 and notes FAA AD 83‑06‑10 (Document; Note).","Operational tracking: recurring inspections at maintenance release or every 500 hours impose monitoring and recordkeeping.","Clerical correction: reprint corrects a typographical error in part numbering, requiring attention to correct applicability (Background 2)."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of SIAI‑Marchetti F260, F260B and F260C aeroplanes fitted with specified Hartzell‑equivalent propeller governors to inspect the governor relief‑valve spring by 31 July 1983 and thereafter at each maintenance release or every 500 flight hours depending on the valve port shape (Applicability; Compliance). It responds to reported breakage of spring P/No. A3107 that can lower governor oil pressure and risk propeller overspeed (Background 1). Operators fund inspections/repairs and must follow SIAI Service Bulletin 260 B35 (Document)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sm-260-14-amdt-1-governor-relief-valve-spring-inspection","history":"/api/acts/ad-sm-260-14-amdt-1-governor-relief-valve-spring-inspection/history","analysis":"/api/acts/ad-sm-260-14-amdt-1-governor-relief-valve-spring-inspection/analysis","conflicts":"/api/acts/ad-sm-260-14-amdt-1-governor-relief-valve-spring-inspection/conflicts","importantCases":"/api/acts/ad-sm-260-14-amdt-1-governor-relief-valve-spring-inspection/important-cases","documents":"/api/acts/ad-sm-260-14-amdt-1-governor-relief-valve-spring-inspection/documents"}}