{"id":"F2006B10863","name":"AD/JBK 117/14 - Tail Rotor Drive Long Shaft Hanger Bearing - Inspection of Fasteners","slug":"ad-jbk-117-14-tail-rotor-drive-long-shaft-hanger-bearing-inspection-of-fasteners","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56359,"registerId":"commonwealth-F2006B10863-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JBK 117/14 - Tail Rotor Drive Long Shaft Hanger Bearing - Inspection of Fasteners","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)  \nKawasaki BK 117 Series Helicopters\n\nAD/JBK 117/14 Tail Rotor Drive Long Shaft Hanger\n\nBearing \\- Inspection of Fasteners\n\nApplicability: Kawasaki BK 117 Helicopters \\- all serial numbers.\n\n  \n5/99\n\nTX\n\nRequirement: Inspect the tail rotor drive long shaft hanger bearing fasteners for torque loading in accordance with the instructions in Kawasaki Service Bulletin No. KSB-117-148 dated 25 Feb 99. All inspection reports are to be forwarded to Kawasaki in the format shown in the Service Bulletin. Major defects discovered during satisfaction of this Directive are to be notified to Kawasaki Heavy Industries, Japan.\n\nNote: JCAB Airworthiness Directive TCD-4975-99 dated 25 February 1999 refers.\n\nCompliance: Before next flight after the effective date of this Directive.\n\nThis Airworthiness Directive becomes effective on 18 March 1999.\n\nBackground: Excessive worn out bolt holes have been found on the bearing support which secures the hanger bearing of the tail rotor drive long shaft. This situation is believed to have been brought about by the under torquing of the bolts during maintenance/assembly in service. This directive instructs inspection of the assembly for correct torque loading on the fasteners. In the event of fasteners being found under-torqued, the fasteners must be removed and the bolt hole measured for wear. Reporting provisions in accordance with the Kawasaki referenced service bulletin are mandatory.","sortOrder":0}],"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 is a standard, narrow Airworthiness Directive addressing a specific safety-critical defect in a specific aircraft type. It has not expanded beyond its original purpose of mandating inspection of tail rotor fasteners on BK 117 helicopters."},"complexity_factors":["Single, specific mechanical component targeted (tail rotor drive long shaft hanger bearing fasteners)","Only one substantive requirement: inspect torque loading per referenced service bulletin","No defined terms section — uses plain technical language","No nested exceptions or conditional logic — straightforward 'do this before next flight' instruction","Cross-reference to only one external document (Kawasaki Service Bulletin KSB-117-148)","Total length: approximately 200 words of operative text","Clear compliance deadline with no alternative methods or phased implementation"],"plain_english_summary":"This CASA Airworthiness Directive mandates immediate inspection and torque check of the tail rotor drive long shaft hanger bearing fasteners on all Kawasaki BK 117 helicopters, following Kawasaki Service Bulletin KSB-117-148. Operators must report results to Kawasaki and notify them of any major defects. Compliance is required before the next flight after 18 March 1999; loose bolts can cause catastrophic tail-rotor failure, so non-compliance grounds the aircraft."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive enforces inspection, reporting and remedial measures for the specified hanger-bearing fasteners on all Kawasaki BK117 helicopters, consistent with the instrument's stated purpose (identifying under‑torqued bolts and worn bolt holes). It does not expand to other components or aircraft types and keeps the original technical scope focused on torque inspection, removal/measurement where required, and mandatory reporting to Kawasaki."},"complexity_factors":["Narrow technical focus: single component on a single helicopter type (Kawasaki BK117 all serial numbers).","Immediate compliance window: inspections required before the next flight increases operational disruption and scheduling pressure.","Dependence on external document: inspection procedures and reporting format are prescribed by Kawasaki Service Bulletin KSB-117-148 (25 Feb 1999).","Mandatory reporting: all inspection reports must be forwarded to Kawasaki; major defects must be notified to Kawasaki Heavy Industries, creating an administrative burden.","Remedial action requirement: under‑torqued fasteners must be removed and bolt holes measured for wear, potentially triggering repairs/part replacement costs.","Some practitioner discretion: the Directive refers to \"major defects\" without a numeric threshold in the text, creating potential ambiguity about reportability.","Low cross-sector legal complexity: no licence changes, penalties, or broad regulatory redefinitions — primarily operational and maintenance compliance."],"plain_english_summary":"This Airworthiness Directive requires immediate inspection of the tail-rotor drive long-shaft hanger bearing fasteners on all Kawasaki BK117 helicopters for correct torque, following Kawasaki Service Bulletin KSB-117-148 (25 Feb 1999). Operators must forward inspection reports to Kawasaki and notify Kawasaki of any major defects. The Directive also requires removal and measurement of bolt holes if fasteners are found under‑torqued. Compliance is mandatory before the next flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jbk-117-14-tail-rotor-drive-long-shaft-hanger-bearing-inspection-of-fasteners","history":"/api/acts/ad-jbk-117-14-tail-rotor-drive-long-shaft-hanger-bearing-inspection-of-fasteners/history","analysis":"/api/acts/ad-jbk-117-14-tail-rotor-drive-long-shaft-hanger-bearing-inspection-of-fasteners/analysis","conflicts":"/api/acts/ad-jbk-117-14-tail-rotor-drive-long-shaft-hanger-bearing-inspection-of-fasteners/conflicts","importantCases":"/api/acts/ad-jbk-117-14-tail-rotor-drive-long-shaft-hanger-bearing-inspection-of-fasteners/important-cases","documents":"/api/acts/ad-jbk-117-14-tail-rotor-drive-long-shaft-hanger-bearing-inspection-of-fasteners/documents"}}