{"id":"F2018L01025","name":"AD/BELL 214/9 Main Rotor Yoke Assembly","slug":"ad-bell-214-9-main-rotor-yoke-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":97726,"registerId":"commonwealth-F2018L01025-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bell Helicopter Textron 214B and 214B-1 ","sectionType":"division","heading":"Bell Helicopter Textron 214B and 214B-1 Series Helicopters","content":"### Bell Helicopter Textron 214B and 214B-1 Series Helicopters\n\n| AD/BELL 214/9 | Main Rotor Yoke Assembly | 14/2018 |\n| ------------- | ------------------------ | ------- |\n\n| Applicability: | Bell Helicopter Textron Inc. (BHTI) model 214B and 214B-1 helicopters, serial numbers (S/N's) 28001 through 28070, equipped with main rotor yoke assembly (assembly) part number (P/N) 214-010-105-001, certificated in any category.                                                                                                                                                                                                                                                                                                                                                                                                  |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Replace main rotor yoke assembly (assembly), part number (P/N)214-010-105-001.2. Install new airspeed versus altitude decals, P/N 214-075-256-105 for BHTI Model 214B-1 and P/N 214-075-256-107 for Model 214B helicopters.3. Inspect the yoke for straightness in accordance with the applicable maintenance manual for the helicopter, as in force from time to time.Note 1: BHTI Alert Service Bulletin No. 214-87-37 Revision A, dated 10 September 1987, as in force at the commencement of this AD, pertains to this AD.Note 2: FAA AD 93-21-10 refers.                                                                       |\n| Compliance:    | 1. a. For assemblies that have 3,700 hours' or less time-in-service on the commencement date of this airworthiness directive (AD), replace the assembly on or before reaching 3,750 hours' time in service.b. For assemblies that have more than 3,700 hours' time-in-service on the commencement date of this AD, replace the assembly within the next 50 hours' time-in-service.2. Unless already accomplished, within 50 hours' time-in-service after the commencement date of this AD.3. Within 50 hours’ time in service, unless previously accomplished, and thereafter at intervals not to exceed 1,200 hours' time-in-service. |\n|                | This AD commences on 17 July 2018.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |\n| Background:    | This AD is prompted by an analysis that revealed a deterioration of residual compressive stresses in the main rotor yoke assembly with increased time in service.                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |\n\n|     | The actions specified by this AD are intended to prevent failure of the assembly, loss of the main rotor, and subsequent loss of control of the helicopter. |\n| --- | ----------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.jpeg)\n\nPieter van Dijk  \nDelegate of the Civil Aviation Safety Authority\n\n9 July 2018","sortOrder":0},{"sectionNumber":"AD/BELL 214/9","sectionType":"part","heading":"AD/BELL 214/9","content":"## AD/BELL 214/9","sortOrder":1},{"sectionNumber":"Main Rotor Yoke Assembly","sectionType":"part","heading":"Main Rotor Yoke Assembly","content":"## Main Rotor Yoke Assembly","sortOrder":2},{"sectionNumber":"14/2018","sectionType":"part","heading":"14/2018","content":"## 14/2018","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard, targeted airworthiness directive addressing a specific safety-critical component failure mode. The scope remains tightly focused on the identified defect in the main rotor yoke assembly."},"complexity_factors":["Multiple compliance deadlines based on hours-in-service thresholds (3,700 hours vs under)","Three distinct requirements with different timing rules (replacement, decal installation, recurring inspection)","Cross-reference to FAA AD 93-21-10 and Bell Service Bulletin 214-87-37 Rev A","Specific part number and serial number applicability narrowing","Conditional language ('unless already accomplished', 'unless previously accomplished')"],"plain_english_summary":"This CASA Airworthiness Directive mandates owners/operators of Bell 214B and 214B‑1 helicopters (S/N 28001–28070) with main rotor yoke P/N 214‑010‑105‑001 to replace that yoke before 3,750 flight hours (or within 50 hours if already over 3,700). It also requires new airspeed stickers within 50 hours and recurring straightness inspections every 1,200 hours. The measures prevent fatigue‑related cracking that could cause rotor separation and catastrophic loss."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The instrument sets explicit applicability, actions and compliance timings for the specified helicopters and part number. The text does not indicate any expansion or narrowing of scope from an earlier version within this document."},"complexity_factors":["Narrow applicability by model, serial numbers and specific part number (Applicability)","Multiple mandated actions: replacement, decal installation, and straightness inspection (Requirement)","Conditional compliance deadlines tied to current hours‑in‑service (Compliance: different timelines for ≤3,700 h and >3,700 h)","Recurring inspection interval requirement every 1,200 hours (Compliance)","Cross‑references to external documents and authorities: maintenance manual 'as in force from time to time', BHTI Alert Service Bulletin, and FAA AD (Requirement/Note 1/Note 2)","Fixed commencement date anchoring compliance windows (Commencement date)"],"plain_english_summary":"Mandates owners/operators of Bell 214B and 214B‑1 helicopters S/N 28001–28070 fitted with main rotor yoke P/N 214‑010‑105‑001 to replace that yoke, fit model‑specific airspeed‑vs‑altitude decals, and inspect the yoke for straightness under the helicopter maintenance manual.\n\nReplacement timing depends on current hours‑in‑service (by 3,750 hours or within 50 hours); inspections recur every 1,200 hours. The directive targets reduced residual compressive stresses that could cause yoke failure; operators carry the compliance cost and must schedule work per the manual."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-214-9-main-rotor-yoke-assembly","history":"/api/acts/ad-bell-214-9-main-rotor-yoke-assembly/history","analysis":"/api/acts/ad-bell-214-9-main-rotor-yoke-assembly/analysis","conflicts":"/api/acts/ad-bell-214-9-main-rotor-yoke-assembly/conflicts","importantCases":"/api/acts/ad-bell-214-9-main-rotor-yoke-assembly/important-cases","documents":"/api/acts/ad-bell-214-9-main-rotor-yoke-assembly/documents"}}