{"id":"F2018L01006","name":"AD/BELL 214/8 Hub Locking Plates","slug":"ad-bell-214-8-hub-locking-plates","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":97704,"registerId":"commonwealth-F2018L01006-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 214/8 | Hub Locking Plates | 14/2018 |\n| ------------- | ------------------ | ------- |\n\n| Applicability: | Bell Helicopter Textron Inc. (BHTI) model 214B and 214B-1 helicopters, serial numbers (S/N's) 28001 to 28070, certificated in any category, equipped with upper and lower locking plates, part numbers (P/N's) 214‑010-231-101 and 214‑010‑232‑101.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | 1. Replace P/N 214-010-232-101 lower locking plate and P/N214-010-231-101 upper locking plate, with locking plate P/N 214-010-569-101 in accordance with Part I of BHTI Alert Service Bulletin (ASB) 214-86-36 dated 8 October 1986, as in force from time to time.2. Visually inspect the hub and lower hub nut assembly for slippage in accordance with Part II of BHTI ASB 214-86-36 dated 8 October 1986, as in force from time to time.3. Perform the following in accordance with Part III of BHTI ASB 214-86-36, dated 8 October 1986, as in force from time to time:a. Inspect the hub locking plate P/N 214-010-569-101 for cracks;b. If a crack is found during this inspection, before further flight, replace the hub locking plate with a serviceable part;c. Retorque the lower hub nut and install locking plate P/N 214-010-569-101, as detailed in Requirement paragraph 1.Note 1: Installation instructions for the scissors and sleeve may be found in the BHTI 214B Maintenance Manual, Chapter 65-20-00.Note 2: FAA AD 87-11-06 refers. |\n| Compliance:    | 1. Unless previously accomplished, within the next 50 hours’ time in service or within 30 days after the commencement date of this AD, whichever occurs first.2. Within the next 25 hours' time in service after completing the requirements of paragraph 1, and thereafter at intervals not to exceed 25 hours' time in service since the most recent inspection.3. Within the next 500 hours' time in service after completing the requirements of paragraph 1 and thereafter at intervals not to exceed 500 hours' time in service since the most recent inspection.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |\n\n|             | This AD commences on 10 July 2018.                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |\n| ----------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Background: | In May 1986, a Bell model 214ST helicopter experienced loss of collective control forcing a rapid, but successful ditching at sea. Subsequent investigation revealed that loss of collective control resulted from failure of the collective hub bearing retention nut lower locking plate which allowed the collective hub nut to unscrew. The actions specified in this Directive are intended to prevent failure of the collective hub locking plate and subsequent loss of control of the helicopter. |\n\n![](image.001.jpeg)\n\nPieter van Dijk  \nDelegate of the Civil Aviation Safety Authority\n\n4 July 2018","sortOrder":0},{"sectionNumber":"AD/BELL 214/8","sectionType":"part","heading":"AD/BELL 214/8","content":"## AD/BELL 214/8","sortOrder":1},{"sectionNumber":"Hub Locking Plates","sectionType":"part","heading":"Hub Locking Plates","content":"## Hub Locking Plates","sortOrder":2},{"sectionNumber":"14/2018","sectionType":"part","heading":"14/2018","content":"## 14/2018","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive targets a defined subset of Bell 214B/214B‑1 helicopters (S/N 28001–28070) and specific locking plate part numbers; it mandates replacement and inspections to address hub locking plate failure risk identified in the 1986 incident. It does not expand beyond that technical corrective scope or add unrelated requirements."},"complexity_factors":["Narrow applicability: specific helicopter models, serial numbers and part numbers reduce regulatory breadth but require accurate fleet tracking.","Stepwise compliance: immediate replacement window (50 hours or 30 days), short-term recurring inspections (25‑hour intervals) and longer periodic inspections (500‑hour intervals) create layered scheduling demands.","Technical maintenance actions: replacement, retorquing and crack inspections require certified maintenance personnel and reference to the BHTI Alert Service Bulletin and Maintenance Manual.","Potential for grounded aircraft: discovery of cracks mandates replacement before further flight, creating operational downtime and parts logistics considerations.","Dependence on manufacturer service information (“as in force from time to time”) introduces some regulatory discretion and version-control for compliance.","Recordkeeping and compliance monitoring burden on operators to prove adherence to intervals and corrective actions."],"plain_english_summary":"This airworthiness directive requires Bell 214B/214B‑1 helicopters (S/N 28001–28070) fitted with specified upper and lower hub locking plates to replace them with a new locking plate (P/N 214‑010‑569‑101), inspect the hub and lower hub nut for slippage and cracks, retorque the nut, and carry out recurring inspections. It affects owners/operators (who pay for parts, labour and downtime) and is intended to prevent collective control loss identified in a 1986 accident, imposing ongoing maintenance and compliance scheduling costs."},"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 AD maintains its original narrow scope. It addresses the specific safety issue identified in the 1986 incident (locking plate failure in Bell 214B helicopters) without expanding to other models, parts, or unrelated systems. The directive remains tightly focused on the original mechanical defect and the prescribed remedy."},"complexity_factors":["Short, single-purpose directive focused on one mechanical issue","Only 3 main requirements with clear sequential steps","Limited applicability (specific serial number range and part numbers)","Straightforward compliance timeline (hours in service or calendar days)","References external technical document (Bell Service Bulletin) but incorporates it clearly","No nested exceptions or conditional logic beyond 'if crack found, replace before flight'","Single cross-reference to related FAA directive (Note 2)"],"plain_english_summary":"This CASA Airworthiness Directive mandates replacement of faulty upper and lower rotor‑hub locking plates on Bell 214B and 214B‑1 helicopters (S/N 28001–28070) to stop a critical nut from backing out and causing loss of collective control. Operators in Australia must fit the improved plate within 50 flight hours or 30 days and perform required follow‑up inspections and periodic crack checks to prevent a recurrence of the 1986 near‑fatal accident."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-214-8-hub-locking-plates","history":"/api/acts/ad-bell-214-8-hub-locking-plates/history","analysis":"/api/acts/ad-bell-214-8-hub-locking-plates/analysis","conflicts":"/api/acts/ad-bell-214-8-hub-locking-plates/conflicts","importantCases":"/api/acts/ad-bell-214-8-hub-locking-plates/important-cases","documents":"/api/acts/ad-bell-214-8-hub-locking-plates/documents"}}