{"id":"F2006B07760","name":"Airworthiness Directives 2004 - Revocation and Remaking - Bell Helicopter Textron 412 Series Helicopters","slug":"airworthiness-directives-2004-revocation-and-remaking-bell-helicopter-textron-412-series-helicopters","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50512,"registerId":"commonwealth-F2006B07760-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"Airworthiness Directives 2004 - Revocation and Remaking - Bell Helicopter Textron 412 Series Helicopters","content":"Airworthiness Directives 2004\n\nI, DAVID ALAN VILLIERS, delegate of the Civil Aviation Safety\n\nAuthority, acting under subregulation 39.001 (1) of the Civil\n\nAviation Safety Regulations 1998:\n\n(a) revoke the Airworthiness Directives mentioned in\n\nSchedule 1; and\n\n(b) make, as separate instruments, each Airworthiness\n\nDirective mentioned in Schedule 1 and attached.\n\n![](image.001.png)\n\nDavid Villiers\n\nDelegate of the Civil Aviation Safety Authority\n\n20 December 2004\n\nNote: Each attached Airworthiness Directive is being re-made in exactly the\n\nsame form as appears in the latest published edition of the Directive.\n\n  \nSchedule 1 Revocation and Remaking of\n\nAirworthiness Directives\n\nBell Helicopter Textron 412 Series Helicopters\n\nAD Name AD Number\n\nEngine Mount Fireshield - Installation AD/BELL 412/1\n\nRetirement Lives - Fatigue Critical Components AD/BELL 412/2 Amdt 1\n\nMain Rotor Yoke - Inspection - CANCELLED AD/BELL 412/3\n\nMain Rotor Yoke - Inspection, Retirement and Modification AD/BELL 412/4 Amdt 1\n\nEngine Fuel Switch - Inspection/Replacement AD/BELL 412/5 Amdt 1\n\nMain Rotor Pitch Link Assemblies - Replacement AD/BELL 412/6\n\nAirspeed and Ground Operation Restriction AD/BELL 412/7 Amdt 1\n\nInstallation of Main Rotor Droop Restraint Kit and Cyclic Stick Centring AD/BELL 412/8\n\nMain Rotor Blade Pitch Horns - Inspection AD/BELL 412/9 Amdt 1\n\nUpper Anti-Collision Strobe Light P/No HR, DF-28DRMS Inspection, AD/BELL 412/10\n\nMain Rotor Yoke, P/N 412-010-101-123 - Inspection AD/BELL 412/11\n\nVertical Fin Forward Spar AD/BELL 412/12 Amdt 5\n\nTail Rotor Trunnion Bearing Housing AD/BELL 412/13\n\nEmergency Flotation System and Squib Valve AD/BELL 412/14 Amdt 1\n\nBattery Cable Installation AD/BELL 412/15\n\nVertical Fin Spar Cap - CANCELLED AD/BELL 412/16\n\nAM-SAFE Harness Buckle Assemblies AD/BELL 412/17\n\nEngine Fuel Valve Electrical Connectors P/No MS3456W14S-5S AD/BELL 412/18\n\nEmergency DC Bus Number One Feeder Circuit AD/BELL 412/19\n\nBolts P/N AN4-5A - Pylon Support AD/BELL 412/20\n\nFuel Cell Interconnect Tube AD/BELL 412/21\n\nMain Transmission Spiral Bevel Gear AD/BELL 412/22\n\nElectrical Wiring Harnesses AD/BELL 412/23\n\nMain Rotor Pitch Link to Pitch Horn Bolt AD/BELL 412/24\n\nMain Rotor Flight Control System Bolts AD/BELL 412/25\n\nBogus Pressure Gauge Emergency Floats P/N 212-073-905-1 AD/BELL 412/26\n\nTailboom Upper Longeron AD/BELL 412/27\n\nLower Planetary Spider Gear - CANCELLED AD/BELL 412/28\n\nTail Rotor Driveshaft Hangar Bearings AD/BELL 412/29\n\n  \nSwashplate Support Assembly AD/BELL 412/30\n\nFin to Tail Boom Junction AD/BELL 412/31\n\nMain Driveshaft and Tail Rotor Drive Over-Temperature Indicators AD/BELL 412/32\n\nMain Transmission Lower Planetary Spider AD/BELL 412/33\n\nSwashplate Support AD/BELL 412/34\n\nTail Boom Doubler and Fin Spar Caps AD/BELL 412/35\n\nMain Rotor Mast AD/BELL 412/36\n\nInternal Hoist AD/BELL 412/37\n\nHydraulic Servo Actuator Shoulder Bolt AD/BELL 412/38\n\nTail Rotor Yoke and Tail Rotor Flapping Stop/Indicator AD/BELL 412/39 Amdt 1\n\nMain Rotor Yoke AD/BELL 412/40\n\nTailboom Attachment Cap Angle AD/BELL 412/41\n\nMain Hydraulic Servo Actuator Rod End Lock Washer AD/BELL 412/42\n\nTail Rotor Counterweight Bellcrank Retention Nut AD/BELL 412/43\n\nTail Rotor Blade Fwd Tip Weight Retention Block and Aft Tip Closure AD/BELL 412/44","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument explicitly states it is remaking the Airworthiness Directives \"in exactly the same form\" as the existing published versions. There is no expansion of scope, no new safety requirements, and no policy change. This is purely a technical restructuring of existing instruments."},"complexity_factors":["Very short instrument (under 2 pages)","No defined terms section","Simple binary structure: revoke (a) and remake (b)","No conditional logic or exceptions","Schedule 1 is purely a table listing AD numbers and titles—no substantive legal content in the instrument itself","Cross-references limited to subregulation 39.001(1) of the Civil Aviation Safety Regulations 1998 (a standard delegation provision)","No amendments, transitional provisions, or interpretive rules"],"plain_english_summary":"This instrument revokes 44 existing Airworthiness Directives for Bell 412 helicopters and immediately remakes them as 44 separate, standalone legal instruments. It’s an administrative restructuring by CASA—not a change to any safety requirements.\n\nIt affects Bell 412 owners, operators and maintenance engineers (and CASA’s regulatory records) by repackaging existing mandatory safety rules for clearer legal management; the technical obligations remain identical."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"This instrument does not broaden or narrow the substantive regulatory requirements that apply to Bell 412 helicopters. It revokes and re‑issues the same ADs in identical form (per the Note). Therefore the scope of regulatory obligations on operators and maintainers remains the same; the change is procedural/administrative (instrument form and registry entries) rather than substantive."},"complexity_factors":["Short primary instrument (single operative paragraph revoking and remaking ADs).","One explicit legal cross‑reference: subregulation 39.001(1) of the Civil Aviation Safety Regulations 1998.","Schedule 1 lists ~44 ADs (AD/BELL 412/1 to AD/BELL 412/44), some with amendment numbers and some marked CANCELLED—the list length adds administrative complexity for users who must check each AD text.","The instrument does not reproduce the full text of each AD; users must consult the separate re‑made AD instruments for substantive requirements, adding a step for compliance verification.","Minimal conditional logic or nested exceptions in this instrument itself (no complex definitions, time limits or compliance pathways contained here)."],"plain_english_summary":"**What this instrument does (mechanically)**\n\n- The Civil Aviation Safety Authority (CASA) delegate uses authority under subregulation 39.001(1) of the Civil Aviation Safety Regulations 1998 to revoke a set of existing Airworthiness Directives (ADs) that apply to Bell Helicopter Textron 412 series helicopters and to re‑make each of those ADs as separate, standalone instruments. (See Schedule 1.)\n- The instrument’s Note states that each re‑made AD is in exactly the same form as the latest published edition of that Directive. In effect, the legal instruments are being replaced one for one without changing their substantive wording.\n\n**Who is affected**\n\n- Owners and operators of Bell 412 series helicopters. They must continue to comply with the requirements set out in each re‑made AD (inspections, part replacements, life limits, operational restrictions, etc.).\n- Maintenance organisations and approved maintenance engineers who carry out inspections, modifications and parts replacements required by those ADs.\n- CASA and its delegate, who make and maintain the AD instruments and maintain the regulatory record.\n\n**Why it matters (claimed purpose, and practical effect)**\n\n- The document’s stated purpose is procedural: to revoke the previously published AD instruments and re‑issue them as separate instruments in the same form. The practical legal effect is to ensure that each AD exists as an individual, current instrument on the regulatory record.\n- Because the re‑made ADs are identical in wording to the latest published versions, the substantive safety obligations on operators and maintainers do not change. Operators who were already complying with the published ADs continue to face the same technical and operational requirements.\n\n**Costs, incentives and implementation considerations**\n\n- Who pays: the direct costs of complying with the ADs fall on aircraft owners/operators and the maintenance providers they engage. Typical costs include labour, inspection time, part purchase and installation, and any operational downtime while work is completed.\n- Who decides: CASA (through its delegate) decides to revoke and re‑make the instruments. Compliance decisions—when and how to schedule work—are made by operators and maintenance organisations subject to the AD deadlines and conditions.\n- Behavioural changes required: operators must ensure their maintenance programs and records reference the re‑made AD instrument identifiers, and continue to perform the inspections, retirements, replacements or operational restrictions set out in each AD. Maintenance organisations must update documentation and work orders to reference the newly issued instruments.\n- Trade‑offs and risks: because the re‑made ADs are identical in substance, the primary risk is administrative or transitional (e.g. record‑keeping errors, temporary confusion about which instrument number to cite). There is no new technical obligation created by this instrument itself.\n- Compliance burden and discretion: the instrument does not change the legal duties in the ADs, so it does not expand CASA’s enforcement discretion in substance; rather it changes the form of the legal instruments. Operators still face the same compliance obligations described in each AD text.\n\n**Concrete mechanics (examples and references in the instrument)**\n\n- The instrument cites subregulation 39.001(1) CASR 1998 as the legal basis for the delegate’s action.\n- Schedule 1 lists approximately 44 named Airworthiness Directives (AD/BELL 412/1 through AD/BELL 412/44), some marked as amended (Amdt) and some marked CANCELLED. Each listed AD is revoked and then re‑made as a separate instrument in the same form as the latest published edition.\n\n**Net effect summary**\n\n- This is largely a procedural housekeeping measure: it rewrites the legal registry entries for a set of ADs without changing their substantive requirements. Operators and maintainers must continue to comply with the same technical requirements, and should update administrative references to the re‑made AD instruments where necessary."},"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/airworthiness-directives-2004-revocation-and-remaking-bell-helicopter-textron-412-series-helicopters","history":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-bell-helicopter-textron-412-series-helicopters/history","analysis":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-bell-helicopter-textron-412-series-helicopters/analysis","conflicts":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-bell-helicopter-textron-412-series-helicopters/conflicts","importantCases":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-bell-helicopter-textron-412-series-helicopters/important-cases","documents":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-bell-helicopter-textron-412-series-helicopters/documents"}}