{"id":"F2006B10265","name":"AD/GBK 117/7 - Retrofit of Engine Overspeed Controller","slug":"ad-gbk-117-7-retrofit-of-engine-overspeed-controller","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55944,"registerId":"commonwealth-F2006B10265-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GBK 117/7 - Retrofit of Engine Overspeed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)  \nEurocopter BK 117 Series Helicopters\n\nAD/GBK 117/7 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 Eurocopter Service Bulletin Number SB-MBB-BK 117-90-103 Revision 1.\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":923},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This directive maintains its original narrow scope — a specific safety modification for a defined subset of BK 117 helicopters to address documented engine overspeed incidents. No expansion beyond the original technical remedy is evident."},"complexity_factors":["Specific applicability limited to two engine models and specific service bulletin revisions","Cross-references to three external documents (Eurocopter Service Bulletin, FAA AD, and another CASA AD)","Dual compliance pathway (inspection interval vs hard deadline)","Technical aviation terminology requiring specialized knowledge (uncontained failure, power turbine, service bulletins)"],"plain_english_summary":"This directive requires operators of Eurocopter BK 117 helicopters with AlliedSignal LTS101-650B1 or LTS101-750B1 engines (who have incorporated LTS 101B-73-10-0127 Rev 2) to install wiring and hardware to enable an electronic engine overspeed controller, per Eurocopter SB‑MBB‑BK117‑90‑103 Rev 1, in conjunction with AD/LTS/13. It prevents uncontained power turbine overspeed and must be done by the next 600‑hour inspection after Aug 1996 or by 31 Dec 1997, whichever is earlier."}},"importantCases":[],"_links":{"self":"/api/acts/ad-gbk-117-7-retrofit-of-engine-overspeed-controller","history":"/api/acts/ad-gbk-117-7-retrofit-of-engine-overspeed-controller/history","analysis":"/api/acts/ad-gbk-117-7-retrofit-of-engine-overspeed-controller/analysis","conflicts":"/api/acts/ad-gbk-117-7-retrofit-of-engine-overspeed-controller/conflicts","importantCases":"/api/acts/ad-gbk-117-7-retrofit-of-engine-overspeed-controller/important-cases","documents":"/api/acts/ad-gbk-117-7-retrofit-of-engine-overspeed-controller/documents"}}