{"id":"F2006B07082","name":"AD/SM-260/5 - Carburettor Air Intake Box and Engine Cowling Drain Holes - Modification","slug":"ad-sm-260-5-carburettor-air-intake-box-and-engine-cowling-drain-holes-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48844,"registerId":"commonwealth-F2006B07082-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SM-260/5 - Carburettor Air Intake Box and Engine Cowling Drain Holes - Modification","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-260/5 Carburettor Air Intake Box and Engine\n\nCowling Drain Holes - Modification\n\n\n3/72\n\n \n\nApplicability: Models F260 and F260B with S/Nos. 101 to 125; 2-26 to 2-49 and 502 except S/Nos.\n\n2-29, 2-33, 2-35, 2-36, 2-37, 2-42, 2-43, 2-47 and 2-48.\n\n \n\nDocument: SIAI Marchetti SB No. 260B9.\n\n \n\nCompliance: Within 100 hours time in service after 28 April 1972.\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":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1841},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow technical scope as a specific safety modification for particular aircraft. There is no evidence of scope creep; it addresses exactly the single mechanical issue identified in the referenced service bulletin."},"complexity_factors":["Single compliance action with no exceptions or alternatives","Limited applicability restricted to specific aircraft serial numbers","No cross-references to other legislative provisions","Clear, unambiguous deadline based on flight hours","Total length is less than 150 words"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — a mandatory safety order issued by the Civil Aviation Safety Authority that requires owners to make specific modifications to their aircraft.\n\n**Who it affects:** Owners and operators of **SIAI Marchetti F260 and F260B** aeroplanes with specific serial numbers (101–125, 2-26 to 2-49, and 502 — but excluding serial numbers 2-29, 2-33, 2-35, 2-36, 2-37, 2-42, 2-43, 2-47, and 2-48).\n\n**What you must do:** Modify the **carburettor air intake box** and **engine cowling drain holes** according to the manufacturer's Service Bulletin No. 260B9. This likely involves drilling or altering drainage holes to prevent fuel or water accumulation that could affect engine performance.\n\n**Deadline:** Complete the work within **100 hours of flight time** after 28 April 1972.\n\n**Why it matters:** This prevents potential engine failure or fire hazards caused by improper ventilation or drainage in the engine compartment."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sm-260-5-carburettor-air-intake-box-and-engine-cowling-drain-holes-modification","history":"/api/acts/ad-sm-260-5-carburettor-air-intake-box-and-engine-cowling-drain-holes-modification/history","analysis":"/api/acts/ad-sm-260-5-carburettor-air-intake-box-and-engine-cowling-drain-holes-modification/analysis","conflicts":"/api/acts/ad-sm-260-5-carburettor-air-intake-box-and-engine-cowling-drain-holes-modification/conflicts","importantCases":"/api/acts/ad-sm-260-5-carburettor-air-intake-box-and-engine-cowling-drain-holes-modification/important-cases","documents":"/api/acts/ad-sm-260-5-carburettor-air-intake-box-and-engine-cowling-drain-holes-modification/documents"}}