{"id":"F2006B06948","name":"AD/SF340/2 - Rudder Limiter High Speed Stop","slug":"ad-sf340-2-rudder-limiter-high-speed-stop","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114846,"registerId":"commonwealth-F2006B06948-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SF340/2 - Rudder Limiter High Speed Stop","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)  SAAB SF340 Series Aeroplanes\n\n \n\nAD/SF340/2 Rudder Limiter High Speed Stop 8/85\n\nApplicability: All models with S/Nos. 340A-003 to -048.\n\n \n\nRequirement: Action in accordance with SAAB-Fairchild S.B. SF340-27-018.\n\n \n\nNote: Swedish AD No 1-006 refers.\n\n \n\nCompliance: Prior to 31 October 1985.\n\n \n\nBackground:  Analysis/tests have demonstrated that it is necessary to reduce the range of travel imposed by the rudder limiter mechanism in the higher speed range to fully comply with the certification requirements.\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":2690},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope addressing the specific rudder limiter safety issue in defined aircraft serial numbers. No expansion beyond the initial technical safety requirement is evident."},"complexity_factors":["Single operative requirement referring to external technical standard (SAAB Service Bulletin)","Limited applicability to specific aircraft serial numbers (340A-003 to -048)","No internal definitions, exceptions, or conditional logic","Document length of fewer than 150 words"],"plain_english_summary":"This Airworthiness Directive applies to specific SAAB SF340 series aircraft (serial numbers 340A-003 through 340A-048). It requires operators to modify the **rudder limiter** — a safety mechanism that restricts how far the aircraft's rudder (the vertical steering surface on the tail) can move.\n\n**What must be done:** Aircraft owners must carry out the modifications specified in the manufacturer's Service Bulletin SF340-27-018. This involves reducing how much the rudder can deflect (move) when the aircraft is flying at high speeds.\n\n**Why it matters:** Testing showed that the existing rudder travel limits at high speeds did not fully meet safety certification standards. Limiting rudder movement prevents pilots from accidentally over-stressing the aircraft structure or losing control during high-speed flight.\n\n**Who is affected:** Operators of SAAB SF340 aircraft within the specific serial number range listed above."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sf340-2-rudder-limiter-high-speed-stop","history":"/api/acts/ad-sf340-2-rudder-limiter-high-speed-stop/history","analysis":"/api/acts/ad-sf340-2-rudder-limiter-high-speed-stop/analysis","conflicts":"/api/acts/ad-sf340-2-rudder-limiter-high-speed-stop/conflicts","importantCases":"/api/acts/ad-sf340-2-rudder-limiter-high-speed-stop/important-cases","documents":"/api/acts/ad-sf340-2-rudder-limiter-high-speed-stop/documents"}}