{"id":"F2005L03435","name":"AD/BELL 412/45 - Emergency Floatation Reservoir Adapter","slug":"ad-bell-412-45-emergency-floatation-reservoir-adapter","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":38794,"registerId":"commonwealth-F2005L03435-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Bell Helicopter Textron 412 Series Helic","sectionType":"division","heading":"Bell Helicopter Textron 412 Series Helicopters","content":"### Bell Helicopter Textron 412 Series Helicopters\n\n| AD/BELL 412/45 | Emergency Floatation Reservoir Adapter | 13/2005 TX |\n| -------------- | -------------------------------------- | ---------- |\n\n| Applicability: | Bell Helicopter Textron Model 412 and 412EP helicopters, modified with Aeronautical Accessories, Inc. (AAI), Supplemental Type Certificate (STC) SH2820SO; or with AAI Parts Manufacturer Approval (PMA) reservoir assembly, part number (P/N) 212-372-050; or with adapter, P/N 212-371-002, installed.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | 1. Vent the nitrogen from the reservoir assembly by following the Accomplishment Instructions, Part II - Floatation System Discharging, of AAI Alert Service Bulletin (ASB) No. AA-05005, Revision A dated 27 June 27 2005 or later FAA Approved revision.2. Remove the valve assembly and air line from the adapter, and inspect the counter bore depth (dimension D) as shown in Figure 1 of the ASB.(a) If dimension D, as depicted in Figure 1 of the ASB, does not exceed .860 inch, recharge the floatation system by following the Accomplishment Instructions, Part III - Floatation System Charging, and referring to Figures 2 and 3 of the ASB.(b) If dimension D, as depicted in Figure 1 of the ASB, exceeds .860 inch, replace the reservoir assembly and the adapter with serviceable parts.3. Discharging and recharging the floatation system and inspecting the counter bore depth dimension of the adapter shall be done in accordance with the specified portions of the ASB.Note: FAA AD 2005-20-38 Amendment 39-14335 refers. |\n| Compliance:    | 1. Within the next 24 hours time-in-service (TIS) or before the next emergency floatation supply bottle nitrogen charging after the effective date of this AD.2. Within the next 24 hours time-in-service (TIS) or before the next emergency floatation supply bottle nitrogen charging after the effective date of this AD.2. (b) Before further flight after the effective date of this AD.3. From the effective date of this AD.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |\n\n|             | This Airworthiness Directive becomes effective on 9 November 2005.                                                                                                                                               |\n| ----------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Background: | The actions detailed in this AD are intended to prevent rupture of an adapter, uncontrolled jetting of pressurized gas from the nitrogen bottle, and subsequent injury to occupants or damage to the helicopter. |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n4 November 2005","sortOrder":0},{"sectionNumber":"AD/BELL 412/45","sectionType":"part","heading":"AD/BELL 412/45","content":"## AD/BELL 412/45","sortOrder":1},{"sectionNumber":"Emergency Floatation Reservoir Adapter","sectionType":"part","heading":"Emergency Floatation Reservoir Adapter","content":"## Emergency Floatation Reservoir Adapter","sortOrder":2},{"sectionNumber":"13/2005 TX","sectionType":"part","heading":"13/2005 TX","content":"## 13/2005 TX","sortOrder":3}],"analysis":{"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"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The AD's scope is confined to Bell 412 and 412EP helicopters that are specifically modified with AAI STC SH2820SO or fitted with the named AAI PMA reservoir/adapter parts; the directive does not expand coverage beyond the listed aircraft, STC or part numbers."},"complexity_factors":["Technical measurement requirement: counter‑bore depth must be checked against a .860 inch threshold (Requirement).","Procedural dependency on AAI Alert Service Bulletin No. AA-05005, Revision A, or later FAA‑approved revision for venting, discharging and charging steps (Requirement).","Parts and modification specificity: applies only to Bell 412/412EP helicopters modified by AAI STC SH2820SO or fitted with AAI PMA parts P/N 212-372-050 or adapter P/N 212-371-002 (Applicability).","Urgent, short compliance windows creating scheduling and operational pressure (within 24 hours TIS or before next charge; before further flight in some cases) (Compliance).","Potential need to remove valve assembly and replace reservoir/adapter with serviceable parts if measurement exceeds the limit, creating parts‑supply and cost considerations (Requirement).","Safety‑critical nature with potential grounding or flight‑restriction consequences if non‑compliant (Background; Compliance).","Cross‑reference to FAA AD and reliance on external approved revisions introduces regulatory coordination and update risk (Note)."],"plain_english_summary":"This Airworthiness Directive requires operators of Bell 412/412EP helicopters fitted with AAI STC SH2820SO or specified AAI reservoir/adapter parts to vent nitrogen, measure the adapter counter‑bore depth, and then recharge or replace the reservoir/adapter depending on that measurement to prevent adapter rupture and uncontrolled gas discharge. The regulator sets urgent compliance deadlines (24 hours or before next charge/before flight) and operators pay for inspection, charging and any replacement while following AAI ASB procedures (Requirement; Compliance)."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific safety defect in a specific adapter part on specific helicopter models. It has not expanded beyond this targeted safety intervention."},"complexity_factors":["Technical aviation terminology throughout (e.g., 'counter bore depth', 'time-in-service', 'Supplemental Type Certificate')","Incorporation by reference to external document (AAI Alert Service Bulletin AA-05005 Revision A) — the AD cannot be understood without consulting this separate technical manual","Conditional logic with precise measurement threshold (0.860 inch) determining different compliance paths","Multiple compliance deadlines depending on which requirement is being met and what condition is found","Specific part number identification required to determine applicability (P/N 212-372-050, P/N 212-371-002)","Cross-reference to US FAA AD 2005-20-38 for additional context"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspections and corrective action for Bell 412/412EP helicopters fitted with Aeronautical Accessories, Inc. emergency flotation systems because a flotation-adapter can rupture, releasing pressurised nitrogen and risking injury or system failure in a water landing.\n\nOperators must vent the reservoir, measure adapter \"dimension D,\" recharge if D ≤ 0.860 in, or replace both reservoir assembly and adapter (and not return to flight) if D > 0.860 in. Actions are required within 24 flight hours or before the next nitrogen recharge."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-412-45-emergency-floatation-reservoir-adapter","history":"/api/acts/ad-bell-412-45-emergency-floatation-reservoir-adapter/history","analysis":"/api/acts/ad-bell-412-45-emergency-floatation-reservoir-adapter/analysis","conflicts":"/api/acts/ad-bell-412-45-emergency-floatation-reservoir-adapter/conflicts","importantCases":"/api/acts/ad-bell-412-45-emergency-floatation-reservoir-adapter/important-cases","documents":"/api/acts/ad-bell-412-45-emergency-floatation-reservoir-adapter/documents"}}