{"id":"F2021L01095","name":"AD/BELL 222/19 Amdt 1 Retrofit of Engine Overspeed Controller","slug":"ad-bell-222-19-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":102002,"registerId":"commonwealth-F2021L01095-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bell Helicopter Textron Canada (BHTC) 22","sectionType":"part","heading":"Bell Helicopter Textron Canada (BHTC) 222 Series Helicopters","content":"# Bell Helicopter Textron Canada (BHTC) 222 Series Helicopters\n\n| AD/BELL 222/19 Amdt 1 | Retrofit of Engine Overspeed Controller | 16/2021 |\n| --------------------- | --------------------------------------- | ------- |\n\n| Applicability: | All Bell Helicopter Textron Canada (BHTC) 222 series helicopters fitted with Honeywell International (formerly AlliedSignal and Textron Lycoming) LTS101‑650C-3, LTS101-650C-3A, or LTS101-750C-1 model engines that have been subject to Honeywell International Service Bulletin (SB) LTS 101C-73-10-0129 Revision 3, as in force on the date of commencement 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 BHTC Service Instructions (SIs) BHT-SI-222-27 or BHT-SI-222-28, as in force on the date of commencement 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. This 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/BELL 222/19 Amdt 1","sectionType":"part","heading":"AD/BELL 222/19 Amdt 1","content":"## AD/BELL 222/19 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":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD remains focused on its original purpose: requiring the retrofit of engine overspeed protection equipment on Bell 222 helicopters. Amendment 1 makes only editorial and reference updates without expanding the scope."},"complexity_factors":["Short, single-purpose directive with one primary requirement","Only 4 defined/referenced documents (2 Service Instructions, 1 related AD, 1 FAA AD)","Single applicability criterion with specific engine model numbers","Simple compliance timing: 'before further flight' with concurrent requirement to another AD","No nested exceptions or conditional logic — straightforward mandate","Cross-references to external technical documents (Service Instructions) rather than internal legislative complexity"],"plain_english_summary":"This AD requires Bell 222 operators with specified Honeywell LTS101 engines to install wiring and hardware for an electronic engine overspeed controller to prevent catastrophic power‑turbine overspeed and uncontained failures. Compliance was required before next flight after 20 August 2021. Amendment 1 only updates wording and removes obsolete references — it does not change the safety requirement."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"Amendment 1 removed obsolete references and made minor editorial changes but did not alter the AD’s applicability or the technical requirement to install wiring/hardware for an electronic engine overspeed controller (Background)."},"complexity_factors":["Technical retrofit required: wiring and associated hardware installation per Bell Service Instructions BHT-SI-222-27 or BHT-SI-222-28 (Requirement).","Narrow applicability: only Bell 222s with specific Honeywell LTS101 engine models that have been subject to a particular Honeywell SB revision (Applicability).","Sequencing dependency: compliance must be concurrent with Requirement 2 of AD/LTS/13 Amdt 1 and before further flight (Compliance) — creates coordination risk between directives.","Immediate compliance timing: ‘before further flight’ after commencement increases operational disruption and downtime risk for affected aircraft (Compliance).","Cross-reference to external rules: AD is based on FAA AD 95-26-01 and references Honeywell and Bell service documents (Requirement, Background) — may require consulting multiple issuers.","Administrative change only in amendment: Amendment 1 removes obsolete references and makes editorial changes, not substantive technical changes (Background) — limited regulatory uncertainty."],"plain_english_summary":"This AD requires owners/operators of Bell 222 helicopters with specified Honeywell LTS101 engines (and subject to a particular Honeywell service bulletin revision) to install wiring and associated hardware so an electronic engine overspeed controller can be fitted. The work follows Bell service instructions and must be done before the next flight after the AD starts. CASA enforces the requirement; operators pay for the modification and schedule certified maintenance to comply."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-222-19-amdt-1-retrofit-of-engine-overspeed-controller","history":"/api/acts/ad-bell-222-19-amdt-1-retrofit-of-engine-overspeed-controller/history","analysis":"/api/acts/ad-bell-222-19-amdt-1-retrofit-of-engine-overspeed-controller/analysis","conflicts":"/api/acts/ad-bell-222-19-amdt-1-retrofit-of-engine-overspeed-controller/conflicts","importantCases":"/api/acts/ad-bell-222-19-amdt-1-retrofit-of-engine-overspeed-controller/important-cases","documents":"/api/acts/ad-bell-222-19-amdt-1-retrofit-of-engine-overspeed-controller/documents"}}