{"id":"F2006B04610","name":"AD/BELL 222/19 - Retrofit of Engine Overspeed Controller","slug":"ad-bell-222-19-retrofit-of-engine-overspeed-controller","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44362,"registerId":"commonwealth-F2006B04610-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 222/19 - Retrofit of Engine Overspeed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)  \nBell Helicopter Textron Canada (BHTC) 222 Series Helicopters\n\nAD/BELL 222/19 Retrofit of Engine Overspeed Controller 9/96\n\nApplicability: All Bell 222 series helicopters fitted with AlliedSignal LTS101-650C-3 or LTS101- 650C-3A or LTS101-750C-1 engines incorporating AlliedSignal Service Bulletin LTS 101C-73-10-0129 Revision 3.\n\nRequirement: To prevent a power turbine overspeed and an uncontained engine failure, incorporate the wiring and associated hardware installation requirements detailed in Bell Helicopter Service Instructions Number BHT-SI-222-27 or BHT-SI-222-28.\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":1811},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This directive maintains a narrow, targeted scope addressing a specific safety-critical defect (uncontained power turbine overspeed) in a specific aircraft/engine combination. It does not expand beyond the original technical safety purpose."},"complexity_factors":["Multiple external technical document references requiring cross-checking (AlliedSignal Service Bulletin LTS 101C-73-10-0129 Revision 3, Bell Service Instructions BHT-SI-222-27/28)","Mandatory coordination with another Airworthiness Directive (CAO AD/LTS/13)","Precise engine model variant applicability requiring verification against aircraft maintenance logs","Dual-method compliance deadline (flight hours threshold vs hard calendar date)"],"plain_english_summary":"**What this does:** This is a mandatory safety order (called an Airworthiness Directive) requiring owners of specific Bell 222 helicopters to install new wiring and hardware. The modification adds an electronic safety system that prevents the engine from spinning too fast and potentially exploding.\n\n**Who it affects:** Operators of Bell 222 series helicopters fitted with specific AlliedSignal engine models (LTS101-650C-3, LTS101-650C-3A, or LTS101-750C-1 variants).\n\n**What must be done:** Install wiring and hardware following Bell Helicopter's technical manuals (Service Instructions BHT-SI-222-27 or BHT-SI-222-28). This modification must happen alongside another safety directive (AD/LTS/13).\n\n**When:** By the earlier of either the next scheduled 600-hour airframe inspection after 15 August 1996, or by 31 December 1997.\n\n**Why it matters:** Prevents catastrophic \"uncontained engine failures\"—where engine parts burst through the casing during flight. The directive responds to reports of power turbines dangerously overspeeding, which could cause the engine to disintegrate."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-222-19-retrofit-of-engine-overspeed-controller","history":"/api/acts/ad-bell-222-19-retrofit-of-engine-overspeed-controller/history","analysis":"/api/acts/ad-bell-222-19-retrofit-of-engine-overspeed-controller/analysis","conflicts":"/api/acts/ad-bell-222-19-retrofit-of-engine-overspeed-controller/conflicts","importantCases":"/api/acts/ad-bell-222-19-retrofit-of-engine-overspeed-controller/important-cases","documents":"/api/acts/ad-bell-222-19-retrofit-of-engine-overspeed-controller/documents"}}