{"id":"F2006B06979","name":"AD/SF340/5 - Installation of Tail De-Icer Valve Heater Blanket","slug":"ad-sf340-5-installation-of-tail-de-icer-valve-heater-blanket","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114894,"registerId":"commonwealth-F2006B06979-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SF340/5 - Installation of Tail De-Icer Valve Heater Blanket","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/SF340/5 Installation of Tail De-Icer Valve Heater Blanket 4/89\n\nApplicability: Serial No’s 340A-003 to 041, 044 and 047. Requirement:  SAAB-Fairchild SB SF340-30-015.\n\nNote: Swedish AD 1-010 also refers.\n\n \n\nCompliance: Before 31 May 1986.\n\n \n\nBackground:  Service experience has shown that the tail de-icer distribution valve is susceptible to freezing due to moisture ingress.\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":2267},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive remains precisely targeted at its original technical purpose: correcting a specific freezing vulnerability in the tail de-icer system. No expansion beyond the identified aircraft models and the specified hardware modification."},"complexity_factors":["Single operative requirement with no exceptions, conditions, or subsections","Limited applicability restricted to specific aircraft serial numbers","No interpretation section or defined terms","Brief document length with only one external technical reference","Simple compliance structure (single deadline)"],"plain_english_summary":"This mandatory Airworthiness Directive requires owners/operators of specific SAAB SF340 aeroplanes to install a Tail De‑Icer Valve Heater Blanket per SAAB Service Bulletin SF340‑30‑015. \n\nThe heater prevents the valve freezing and blocking de‑icing fluid to the tail—avoiding tail ice accumulation that could impair aircraft control in freezing conditions."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sf340-5-installation-of-tail-de-icer-valve-heater-blanket","history":"/api/acts/ad-sf340-5-installation-of-tail-de-icer-valve-heater-blanket/history","analysis":"/api/acts/ad-sf340-5-installation-of-tail-de-icer-valve-heater-blanket/analysis","conflicts":"/api/acts/ad-sf340-5-installation-of-tail-de-icer-valve-heater-blanket/conflicts","importantCases":"/api/acts/ad-sf340-5-installation-of-tail-de-icer-valve-heater-blanket/important-cases","documents":"/api/acts/ad-sf340-5-installation-of-tail-de-icer-valve-heater-blanket/documents"}}