{"id":"F2006B10867","name":"AD/JBK 117/19 - Vertical Fin Skin Panelling","slug":"ad-jbk-117-19-vertical-fin-skin-panelling","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56366,"registerId":"commonwealth-F2006B10867-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)  \n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)  \n\nKawasaki BK 117 Series Helicopters","sortOrder":0},{"sectionNumber":"AD/JBK 117/19 Vertical Fin Skin Panellin","sectionType":"part","heading":"AD/JBK 117/19 Vertical Fin Skin Panelling 11/2003","content":"# AD/JBK 117/19 Vertical Fin Skin Panelling 11/2003\n\nDM\n\nApplicability: Model BK117, BK117A-3, BK117A-4, BK117B-1, BK117B-2, and BK117C-1\n\nhelicopters.\n\nRequirement: Action in accordance with Kawasaki Service Bulletin No. KSB-117-215.\n\nNote: Japan JCAB AD No. TCD-6273-2003 refers.\n\nCompliance: Within 100 flight hours after 17 September 2003.\n\nThis Airworthiness Directive becomes effective on 17 September 2003.\n\nBackground: The manufacturer has determined that metal sheeting of 0.6mm thickness instead of the specified 0.8mm thickness, was used during production for the skin panelling of several vertical fins. This Directive requires an inspection of vertical fin skin thickness.\n\n![Signature of David Villiers Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nDavid Villiers\n\nDelegate of the Civil Aviation Safety Authority 10 September 2003\n\n![](image.001.png)","sortOrder":1}],"analysis":{"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope — addressing a specific manufacturing defect in specific helicopter models. There is no evidence of scope creep; it targets exactly one safety issue (vertical fin skin thickness) for exactly six model variants."},"complexity_factors":["Very short document (under 300 words)","Only 6 defined models in applicability section","Single requirement referencing an external technical document (Kawasaki Service Bulletin)","Simple compliance deadline (100 flight hours from effective date)","No nested exceptions, conditional logic, or cross-references to other legislation","Straightforward factual background with one technical issue (metal thickness)"],"plain_english_summary":"This mandatory CASA Airworthiness Directive orders owners/operators of specified Kawasaki BK117 helicopters to inspect the vertical fin skin to confirm correct thickness.  \n\nThe action responds to discovery some aircraft have 0.6mm skin instead of required 0.8mm, which could weaken the tail. Inspections must follow Kawasaki Service Bulletin KSB-117-215 and be completed within 100 flight hours after 17 September 2003."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD implements the manufacturer’s finding by mandating an inspection of vertical fin skin thickness per the Kawasaki service bulletin within a defined timeframe. It does not broaden or narrow the set of affected aircraft beyond the manufacturer’s identified production issue, nor does it add additional requirements beyond the referenced service instructions."},"complexity_factors":["Narrow applicability: specific Kawasaki BK117 models are listed (BK117, BK117A-3, BK117A-4, BK117B-1, BK117B-2, BK117C-1).","Single, time-limited requirement: one inspection action with a fixed compliance window (within 100 flight hours after 17 September 2003).","Dependency on external document: requires compliance with Kawasaki Service Bulletin No. KSB-117-215 (action details not reproduced in the AD).","Regulatory basis stated: issued under CASR 1998 subregulation 39.1(1), so legal force is clear.","Potential follow-up actions implicit: AD mandates inspection but does not specify corrective measures in the text (those likely in the referenced service bulletin).","Cross-reference to foreign AD (Japan JCAB TCD-6273-2003) creates alignment but adds an external compliance reference."],"plain_english_summary":"This Airworthiness Directive orders operators of Kawasaki BK117 variants to inspect the vertical fin skin thickness because some fins were built with 0.6 mm sheeting instead of the specified 0.8 mm. The AD requires action in accordance with Kawasaki Service Bulletin KSB-117-215 and must be carried out within 100 flight hours after 17 September 2003. Operators bear the cost and must follow the manufacturer’s inspection instructions; the CASA delegate issued the mandatory requirement under CASR authority."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jbk-117-19-vertical-fin-skin-panelling","history":"/api/acts/ad-jbk-117-19-vertical-fin-skin-panelling/history","analysis":"/api/acts/ad-jbk-117-19-vertical-fin-skin-panelling/analysis","conflicts":"/api/acts/ad-jbk-117-19-vertical-fin-skin-panelling/conflicts","importantCases":"/api/acts/ad-jbk-117-19-vertical-fin-skin-panelling/important-cases","documents":"/api/acts/ad-jbk-117-19-vertical-fin-skin-panelling/documents"}}