{"id":"F2006B04604","name":"AD/BELL 214/4 - Tail Rotor Yoke","slug":"ad-bell-214-4-tail-rotor-yoke","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44356,"registerId":"commonwealth-F2006B04604-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)\n\nBell Helicopter Textron 214 Series Helicopters","sortOrder":0},{"sectionNumber":"AD/BELL 214/4 Tail Rotor Yoke 2/2003 DM","sectionType":"part","heading":"AD/BELL 214/4 Tail Rotor Yoke 2/2003 DM","content":"# AD/BELL 214/4 Tail Rotor Yoke 2/2003 DM\n\nApplicability: Model 214B and 214B-1 helicopters, serial numbers 28001 and subsequent. Requirement: 1. Review the historical records of the tail rotor yoke assembly (yoke assembly),\n\npart number 214-011-802-105 or 214-011-802-111, for any recorded static or dynamic incidents that could have imposed a bending load on the yoke, but did not require replacing the yoke assembly; for example, an incident in which a damaged tail rotor blade was replaced due to a blade strike. If such a history exists, replace the yoke assembly with a serviceable yoke assembly.\n\n    2. Unless Requirement 3 has already been accomplished, accomplish the following:\n\n    Install a Never Exceed Velocity (Vne) red line at 130 knots indicated airspeed (KIAS) on the pilot and co-pilot airspeed indicators using red tape or paint, and a slippage indicator on the instrument case and glass.\n\n    b. Install a placard made of material that is not easily erased, disfigured, or obscured on the instrument panel in clear view of the pilot and co-pilot with the following words:\n\n“Observe temporary Maximum Never Exceed (Vne) airspeed red line (marked at 130 knots indicated airspeed (KIAS). Vne is the greater of 10 KIAS less than the value presented on the airspeed limits placard or 68 KIAS for each ambient condition”.\n\n    c. Insert the applicable Bell 214B or 214B-1 Temporary Revision for Airspeed Restriction, dated 16 August 1996, which is attached to Bell Alert Service Bulletin (ASB) No. 214-96-57 dated 26 August 1996, into the Limitations section of the applicable Model 214B or 214B-1 Rotorcraft Flight Manual (RFM).\n\n    3. Accomplish the following:\n\n    Remove the yoke assembly part number 214-011-802-105 or 214-011-802- 111, and replace it with a serviceable yoke assembly with zero hours time in service, or a serviceable yoke assembly (regardless of time in service) that has passed a one-time x-ray diffraction inspection in accordance with ASB 214-96-57.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":false,"description":"The AD's scope remains focused on Model 214B and 214B‑1 helicopters, S/N 28001 and subsequent, addressing tail rotor yoke bending‑load histories and prescribing records review, temporary airspeed limitations/placards, RFM insertion, and replacement or X‑ray inspection of specified yoke part numbers (Applicability; Requirements 1–3; ASB 214‑96‑57). No expansion beyond those specified aircraft, parts and corrective measures is apparent in the instrument."},"complexity_factors":["Narrow applicability to specific models and serial numbers (Applicability) — reduces universality but requires careful fleet identification.","Multiple distinct compliance actions (records review, instrument markings, RFM insertion, physical replacement or inspection) increase administrative and operational steps (Requirement 1–3).","Technical inspection requirement: one‑time X‑ray diffraction inspection referenced as an acceptance path (Requirement 3; ASB 214‑96‑57) — needs specialised equipment and expertise.","Alternative compliance paths and conditional triggers (e.g. replace if historical bending incidents found; skip temporary markings if Requirement 3 already done) create decision points for operators (Requirement 1–2).","Dependence on external manufacturer service information (Bell ASB 214‑96‑57 and attached Temporary Revision) requires accessing and following another document.","Potential supply and downtime impacts from requiring a zero‑hours serviceable yoke assembly or removal for inspection — logistical and cost burdens on operators (Requirement 3).","Legal/regulatory enforcement basis under CAR 1998 subreg 39.1(1) — administrative discretion in issuing and enforcing the AD increases regulatory compliance risk."],"plain_english_summary":"This Airworthiness Directive requires operators of Bell 214B and 214B‑1 helicopters (serial numbers 28001 onward) to check tail rotor yoke histories, apply a temporary 130 KIAS Vne marking and placards, update the flight manual, and replace or X‑ray‑inspect suspect yoke assemblies. Owners and operators must pay for inspections, markings and any replacement parts or testing. CASA issued the AD to address possible bending loads on the yoke that could create an unsafe condition."},"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":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific unsafe condition in specific Bell helicopter models. It has not expanded beyond its original safety purpose of addressing tail rotor yoke integrity."},"complexity_factors":["Single specific aircraft model and part number scope limits complexity","Three distinct requirements with clear sequential logic (check history → temporary measures → permanent replacement)","Specific technical references to manufacturer documents (Bell Alert Service Bulletin 214-96-57, Temporary Revision dated 16 August 1996)","Precise part numbers (214-011-802-105, 214-011-802-111) and serial number range (28001 and subsequent)","Conditional logic in Requirement 2 ('Unless Requirement 3 has already been accomplished')","Specific technical installation instructions (red tape or paint, slippage indicator, placard material requirements)","No defined terms section or extensive cross-referencing to other legislation"],"plain_english_summary":"This AD mandates safety actions for Bell 214B/214B‑1 helicopters (s/n 28001+) with tail rotor yokes P/N 214‑011‑802‑105 or ‑111 after concerns that past blade strikes can cause hidden damage. Operators must review maintenance history and immediately replace any yoke subject to bending/stress events. Until replacement, impose a 130 kt airspeed limit, cockpit placard, and temporary flight manual revision. Final compliance requires a new yoke or a used yoke cleared by x‑ray inspection."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-214-4-tail-rotor-yoke","history":"/api/acts/ad-bell-214-4-tail-rotor-yoke/history","analysis":"/api/acts/ad-bell-214-4-tail-rotor-yoke/analysis","conflicts":"/api/acts/ad-bell-214-4-tail-rotor-yoke/conflicts","importantCases":"/api/acts/ad-bell-214-4-tail-rotor-yoke/important-cases","documents":"/api/acts/ad-bell-214-4-tail-rotor-yoke/documents"}}