{"id":"F2006B10876","name":"AD/JBK 117/9 - Retrofit of Engine Overspeed Controller","slug":"ad-jbk-117-9-retrofit-of-engine-overspeed-controller","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56383,"registerId":"commonwealth-F2006B10876-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JBK 117/9 - Retrofit of Engine Overspeed Controller","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 117/9 Retrofit of Engine Overspeed Controller 9/96\n\nApplicability: All BK 117 series helicopters fitted with AlliedSignal LTS101-650B1 or LTS101- 750B1 engines incorporating AlliedSignal Service Bulletin LTS 101B-73-10-0127 Revision 2.\n\nRequirement: To prevent a power turbine overspeed and an uncontained engine failure, incorporate the wiring and associated hardware installation requirements detailed in Kawasaki Service Bulletin Number KSB-117-101.\n\nNote 1: CAO Airworthiness Directive Part 106 AD/LTS/13 refers. Note 2: FAA Airworthiness Directive AD 95-26-01 refers.\n\nCompliance: Effective 15 August 1996: Concurrent with CAO Part 106 Airworthiness Directive AD/LTS/13, Requirement 2; at the next scheduled 600 hour airframe inspection after the effective date of this directive, but no later than 31 December 1997.\n\nBackground: This directive has been issued to require the wiring and associated hardware modifications necessary to permit the incorporation of an electronic engine overspeed controller. The requirement, in conjunction with AD/LTS/13, addresses reports of uncontained power turbine overspeed events.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1481},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive remains precisely focused on its original purpose of mandating safety modifications to prevent engine overspeed failures in specific helicopter models. No scope expansion is evident."},"complexity_factors":["Technical aviation terminology requiring specialized engineering knowledge (power turbine, uncontained failure, airframe inspection)","Multiple cross-references to other regulatory instruments (CAO Part 106 AD/LTS/13 and FAA AD 95-26-01)","Dual compliance timing requirements (flight hours-based and absolute calendar deadline)","Specific manufacturer service bulletin references with revision numbers"],"plain_english_summary":"This directive requires owners/operators of Kawasaki BK 117 helicopters with AlliedSignal LTS101-650B1 or LTS101-750B1 engines (per AlliedSignal Service Bulletin LTS 101B-73-10-0127 Rev 2) to modify electrical wiring/hardware so an electronic engine overspeed controller will work.  \n\nWork must be done per Kawasaki Service Bulletin KSB-117-101 at the next 600-hour inspection after 15 Aug 1996, but by 31 Dec 1997 at the latest, to prevent uncontained power-turbine overspeed events."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jbk-117-9-retrofit-of-engine-overspeed-controller","history":"/api/acts/ad-jbk-117-9-retrofit-of-engine-overspeed-controller/history","analysis":"/api/acts/ad-jbk-117-9-retrofit-of-engine-overspeed-controller/analysis","conflicts":"/api/acts/ad-jbk-117-9-retrofit-of-engine-overspeed-controller/conflicts","importantCases":"/api/acts/ad-jbk-117-9-retrofit-of-engine-overspeed-controller/important-cases","documents":"/api/acts/ad-jbk-117-9-retrofit-of-engine-overspeed-controller/documents"}}