{"id":"F2021L01092","name":"AD/JBK 117/9 Amdt 1 Retrofit of Engine Overspeed Controller","slug":"ad-jbk-117-9-amdt-1-retrofit-of-engine-overspeed-controller","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":101999,"registerId":"commonwealth-F2021L01092-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Kawasaki BK 117 Series Helicopters","sectionType":"part","heading":"Kawasaki BK 117 Series Helicopters","content":"# Kawasaki BK 117 Series Helicopters\n\n| AD/JBK 117/9 Amdt 1 | Retrofit of Engine Overspeed Controller | 16/2021 |\n| ------------------- | --------------------------------------- | ------- |\n\n| Applicability: | All Kawasaki BK 117 series helicopters fitted with Honeywell International (formerly AlliedSignal and Textron Lycoming) LTS101-650B1 or LTS101-750B1 model engines that have been subject to Honeywell International Service Bulletin (SB) LTS 101B‑73‑10-0127 Revision 2, as in force on the commencement date of this AD.                                                                                                                   |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | To prevent a power turbine overspeed and an uncontained engine failure, comply with the wiring and associated hardware installation requirements detailed in Kawasaki Service Bulletin KSB-117-101, as in force on the commencement date of this AD.Note 1: CASA Airworthiness Directive (AD) AD/LTS/13 Amdt 1 relates to this AD.Note 2: United States of America Federal Aviation Administration (FAA) AD 95‑26‑01 is the basis of this AD. |\n| Compliance:    | Concurrent with Requirement 2 of AD/LTS/13 Amdt 1, as in force from time to time, but before further flight after the commencement date of this AD, unless accomplished previously.                                                                                                                                                                                                                                                           |\n|                | This AD commences on 20 August 2021.                                                                                                                                                                                                                                                                                                                                                                                                          |\n| Background:    | 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 Amdt 1, addresses reports of uncontained power turbine overspeed events.Amendment 1 of this AD removes obsolete references and makes minor editorial changes to reflect current requirements.                   |\n\n![Text\nDescription automatically generated](image.001.jpeg)\n\nDavid Punshon  \nDelegate of the Civil Aviation Safety Authority\n\n9 August 2021","sortOrder":0},{"sectionNumber":"AD/JBK 117/9 Amdt 1","sectionType":"part","heading":"AD/JBK 117/9 Amdt 1","content":"## AD/JBK 117/9 Amdt 1","sortOrder":1},{"sectionNumber":"Retrofit of Engine Overspeed Controller","sectionType":"part","heading":"Retrofit of Engine Overspeed Controller","content":"## Retrofit of Engine Overspeed Controller","sortOrder":2},{"sectionNumber":"16/2021","sectionType":"part","heading":"16/2021","content":"## 16/2021","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Amendment 1 removes obsolete references and makes minor editorial changes to reflect current requirements (Background). The directive's substantive coverage — requiring wiring and associated hardware to permit an electronic engine overspeed controller for the listed BK 117/engine combinations and the compliance timing linked to AD/LTS/13 Amdt 1 — is unchanged."},"complexity_factors":["Cross-references to other directives and service bulletins create interpretive steps (Compliance; Requirement).","Technical retrofit requirement for wiring and hardware installation requires specialised maintenance, parts and qualified personnel (Requirement).","Narrow technical applicability limited to BK 117s with specific Honeywell LTS101 engine models and prior SB status increases need to verify aircraft configuration (Applicability).","Strict timing language ('before further flight' and 'concurrent with Requirement 2 of AD/LTS/13 Amdt 1') imposes operational scheduling constraints (Compliance).","Regulatory layering: cites Honeywell Service Bulletin and FAA AD as basis, requiring operators to consult multiple external documents (Requirement; Background).","Amendment notes are editorial only but require checking updated text to confirm no substantive changes (Background)."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Kawasaki BK 117 helicopters with Honeywell LTS101‑650B1 or LTS101‑750B1 engines (and previously subject to Honeywell SB LTS101B‑73‑10‑0127 Rev 2) to install specified wiring and associated hardware so an electronic engine overspeed controller can be incorporated. The stated purpose is to reduce the risk of power turbine overspeed and uncontained engine failure. Compliance must be done concurrently with AD/LTS/13 Amdt 1 and before further flight; operators pay for and schedule the retrofit."},"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 amendment makes only editorial changes — removing obsolete references and minor wording updates. The core safety requirement (retrofitting the engine overspeed controller) remains unchanged from the original AD."},"complexity_factors":["Single, specific applicability criterion (one helicopter series with specific engine models)","Only one substantive requirement (install wiring per specified service bulletin)","Clear compliance deadline (before further flight after commencement date)","Minimal cross-referencing (only two related documents noted)","Short document length (approximately 200 words of substantive content)","No nested exceptions or conditional logic beyond the 'unless accomplished previously' exemption"],"plain_english_summary":"This AD mandates installation of new wiring and hardware on Kawasaki BK117 helicopters with Honeywell LTS101-650B1 or LTS101-750B1 engines (where a specific Honeywell service bulletin has already been applied) to enable fitting an electronic engine overspeed controller. It addresses the risk of power turbine overspeed and potential uncontained engine failure.\n\nWork must be done before next flight after 20 August 2021; Amendment 1 only corrects references and wording without changing the safety requirement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jbk-117-9-amdt-1-retrofit-of-engine-overspeed-controller","history":"/api/acts/ad-jbk-117-9-amdt-1-retrofit-of-engine-overspeed-controller/history","analysis":"/api/acts/ad-jbk-117-9-amdt-1-retrofit-of-engine-overspeed-controller/analysis","conflicts":"/api/acts/ad-jbk-117-9-amdt-1-retrofit-of-engine-overspeed-controller/conflicts","importantCases":"/api/acts/ad-jbk-117-9-amdt-1-retrofit-of-engine-overspeed-controller/important-cases","documents":"/api/acts/ad-jbk-117-9-amdt-1-retrofit-of-engine-overspeed-controller/documents"}}