{"id":"F2006B07856","name":"Airworthiness Directives 2004 - Revocation and Remaking - Eurocopter AS 355 (Twin Ecureuil) Series Helicopters","slug":"airworthiness-directives-2004-revocation-and-remaking-eurocopter-as-355-twin-ecureuil-series-helicop","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50820,"registerId":"commonwealth-F2006B07856-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 - Eurocopter AS 355 (Twin Ecureuil) 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\nEurocopter AS 355 (Twin Ecureuil) Series Helicopters\n\nAD Name AD Number\n\nRetirement Life - Fatigue Critical Components AD/AS 355/1 Amdt 8\n\nTail Upper Fin Support Fitting - CANCELLED AD/AS 355/2 Amdt 1\n\nTail Rotor Blades, Bonding Separation of Stainless Steel Leading Edge AD/AS 355/3\n\nTail Rotor Drive Shaft Bearings - CANCELLED AD/AS 355/4\n\nUpper Fin Attachment Fitting - Inspection AD/AS 355/5\n\nFire Proofing Of Power Plant Firewall - CANCELLED AD/AS 355/6\n\nTail Rotor Blade Spar AD/AS 355/7 Amdt 5\n\nMain Gearbox Filter - Inspection AD/AS 355/8\n\nMain Gear Box Bevel Reduction Gear Module - Inspection of Bevel Ring AD/AS 355/9\n\nMain Rotor Mast AD/AS 355/10 Amdt 4\n\nMain Rotor Transmission Epicyclic Planet Pinion Cage - Replacement - AD/AS 355/11 Amdt 2\n\nTail Rotor Blade Stainless Steel Leading Edge Protective Strips - CANCELLED AD/AS 355/12\n\nHorizontal Stabilizer - Inspection and Retirement AD/AS 355/13 Amdt 1\n\nCombiner Gearbox R.H. and L.H. AD/AS 355/14 Amdt 1\n\nSliding Door Ball Joint - Inspection and Modification AD/AS 355/15 Amdt 1\n\nMain Gearbox Lubrication System - CANCELLED AD/AS 355/16\n\nSecuraiglon (Ex Laiglon) Safety Belts - Modification AD/AS 355/17\n\nMain Rotor Sleeve Beams AD/AS 355/18\n\nRear RH & LH Steps AD/AS 355/19 Amdt 1\n\nEngine Fire Extinguishing System AD/AS 355/20\n\nStarflex Arms and MGB Suspension Bars - CANCELLED AD/AS 355/21\n\nMain Rotor Head, Main Gearbox and Landing Gear AD/AS 355/22\n\nHydraulic System AD/AS 355/23\n\nConsolidation of Early Airworthiness Directives AD/AS 355/24 Amdt 2\n\nMGB Suspension Bars AD/AS 355/25\n\nTail Rotor Control Spider AD/AS 355/26 Amdt 1\n\nWinch Attachment Angle Brackets - CANCELLED AD/AS 355/27\n\nInstallation of Automatic Relighting System AD/AS 355/28 Amdt 2\n\nTail Rotor Front Drive Shaft - CANCELLED AD/AS 355/29\n\n  \nCargo Hook Emergency Manual Control AD/AS 355/30\n\nTail Rotor Gearbox Casing AD/AS 355/31\n\nServo Control Securing Screws AD/AS 355/32\n\nTail Rotor Front Drive Shaft AD/AS 355/33 Amdt 1\n\nRotating Swashplate Bearing AD/AS 355/34 Amdt 1\n\nAC Generation System AD/AS 355/35\n\nAft Section Tail Rotor Drive Shaft Bearing AD/AS 355/36 Amdt 1\n\nTail Rotor Pitch Control Lever Expansion Pin AD/AS 355/37\n\nTail Rotor Drive Shaft Bearings AD/AS 355/38\n\nElectric Hoist Installation AD/AS 355/39\n\nEmergency Locator Transmitter Antenna AD/AS 355/40\n\nMain Rotor Pitch Change Horn Bushes AD/AS 355/41 Amdt 1\n\nLucas Air Equipment Hoist - Explosive Squib AD/AS 355/42\n\nIn Door Sliding Windows AD/AS 355/43 Amdt 1\n\nEngine Fire Detection AD/AS 355/44\n\nCyclic Pitch Change Rod AD/AS 355/45\n\nMain Rotor Shaft Oil Jet AD/AS 355/46\n\nMGB Suspension Bi-Directional Cross Beam AD/AS 355/47 Amdt 1\n\nTail Boom-to-Aircraft Structure Junction Attachment Screws AD/AS 355/48 Amdt 1\n\nSingle-Pole Circuit Breakers AD/AS 355/49\n\nTail Rotor Hub Pitch Change Bearings AD/AS 355/50 Amdt 4\n\nStarter Generators - CANCELLED AD/AS 355/51\n\nTR Head Pitch Change Plate Bearing Spacer AD/AS 355/52 Amdt 1\n\nFerry Fuel Tanks AD/AS 355/53\n\nThis AD yet to be issued AD/AS 355/54\n\nElectrical Power System Failure - CANCELLED AD/AS 355/55\n\nStarter Generators - CANCELLED AD/AS 355/56\n\nTail Rotor Hub Pitch Change Bearings AD/AS 355/57 Amdt 1\n\nRear Bench Cushions AD/AS 355/58 Amdt 1\n\nMain Rotor Starflex Star AD/AS 355/59 Amdt 3\n\nTail Rotor Blade Trailing Edge AD/AS 355/60\n\nStarter Generators AD/AS 355/61\n\nBREEZE Electric Hoist AD/AS 355/62\n\nTail Servo Control Rod Eye End Fitting AD/AS 355/63 Amdt 1\n\nMain Servocontrol Rods AD/AS 355/64 Amdt 1\n\nHorizontal Situation Indicator AD/AS 355/65 Amdt 1\n\n  \nSliding Door AD/AS 355/66 Amdt 1\n\nMain Gearbox Lubrication Pump AD/AS 355/67 Amdt 1\n\n'TRW-SAMM' Main Servocontrols AD/AS 355/68\n\nMain Rotor and Tail Rotor Dynamic Components AD/AS 355/69 Amdt 1\n\nElectric Hoists AD/AS 355/70\n\nElectrical Power System AD/AS 355/71 Amdt 1\n\nCyclic Control AD/AS 355/72 Amdt 1\n\nFlight Control Stop Screws AD/AS 355/73 Amdt 1\n\nCamera System Installation AD/AS 355/74\n\nMGB Free-Wheel AD/AS 355/75 Amdt 1\n\nHoist Hooks AD/AS 355/76\n\nRear Structure Junction Frame AD/AS 355/77\n\nHoist Operator's Belt Snap Hook AD/AS 355/78\n\nHydraulic System - Hydraulic Cut Off Function AD/AS 355/79\n\nCamera System Installation - 2 AD/AS 355/80\n\nHydraulic Fluid in Cold Weather AD/AS 355/81\n\nBREEZE Hoist Hooks AD/AS 355/82\n\nTail Rotor Blade Trailing Edge Tab AD/AS 355/83","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This instrument does not broaden or change the substantive scope of the listed Airworthiness Directives. It is administrative: it preserves existing technical requirements by revoking existing instruments and re‑making them in the same wording as the latest published editions (see Note and Schedule 1). The action reorganises how ADs are recorded and published rather than adding new obligations or extending regulatory reach."},"complexity_factors":["Single operative clause with two related actions (revoke and remake) under subregulation 39.001(1)","Schedule 1 lists around 80+ AD entries (numbered up to AD/AS 355/83) requiring administrative processing","Multiple entries show amendment annotations (e.g. 'Amdt 1', 'Amdt 4') which require matching to the latest published editions","Several entries are marked 'CANCELLED' and one is marked 'yet to be issued' (adds minor conditional bookkeeping)","Note specifying remade ADs are 'in exactly the same form' reduces substantive complexity but increases reliance on external published editions","Low cross‑referencing within the instrument itself, but reliance on other publications (the latest published edition of each AD) for substantive terms"],"plain_english_summary":"**What this instrument does, in plain English**\n\n- This is a housekeeping/regulatory instrument made by a delegate of the Civil Aviation Safety Authority (CASA) under subregulation 39.001(1) of the Civil Aviation Safety Regulations 1998. (That subregulation authorises CASA to make or revoke airworthiness directives.)\n\n- The instrument does two mechanical things (see Schedule 1): it revokes a set of existing Airworthiness Directives (ADs) that apply to Eurocopter AS 355 (Twin Ecureuil) series helicopters and then re‑makes each of those ADs as a separate legal instrument. The ADs are re‑issued \"in exactly the same form as appears in the latest published edition of the Directive\" (the instrument's Note). The list of ADs to be revoked and re‑made is in Schedule 1.\n\n**Who is affected**\n\n- Owners and operators of Eurocopter AS 355 (Twin Ecureuil) helicopters. Those parties must continue to comply with whatever maintenance, inspection, retirement, modification or other obligations are stated in the relevant ADs.\n- Maintenance organisations, engineers and other service providers who carry out work required by the ADs.\n- CASA and its delegates, who administer and publish the ADs.\n\n**Why it matters (mechanically)**\n\n- Airworthiness Directives set mandatory technical requirements (inspections, replacements, modifications, life limits, etc.) to keep an aircraft type safe. This instrument does not change the technical requirements themselves; it reorganises how those requirements are published and recorded by revoking old consolidated instruments and issuing separate AD instruments.\n\n**How it works, step by step**\n\n1. The delegate uses authority in subregulation 39.001(1) to revoke each AD named in Schedule 1. (Revocation removes the previous instrument from the statute record.)\n2. Each AD named in Schedule 1 is then made again as a separate instrument, attached to this instrument, and in the same wording as the latest published edition. That preserves the substantive content of each AD while changing their formal instrument status.\n\n**Practical effects and incentives**\n\n- For regulated parties (operators and maintainers): There is no intended change in operational obligations or compliance costs because the ADs are remade in the same form. Practically, they may need to update their document references or internal compliance trackers to point to the newly issued separate AD instruments instead of the prior consolidated instrument(s).\n\n- For CASA and regulators: The change reduces ambiguity about the legal form of each AD (each becomes a stand‑alone instrument). That can simplify administration, record keeping and legal citation.\n\n- Costs and trade‑offs: The main cost is administrative (issuing and re‑publishing many separate instruments and stakeholders updating references). There is a small implementation risk if any remade instrument is published incorrectly; that could create temporary legal uncertainty until corrected. The substantive safety and maintenance requirements are intended to remain unchanged because the ADs are remade \"in exactly the same form\" (see the Note and Schedule 1).\n\n**Other notable points in the Schedule**\n\n- The Schedule lists many ADs for the AS 355 line (including AD numbers and amendment numbers). Several entries are marked \"CANCELLED\", indicating those particular ADs were already cancelled in prior action and the cancellation is being recorded in the remade instrument list.\n- One entry (AD/AS 355/54) is noted as \"yet to be issued\", which functions as a placeholder in the Schedule.\n\n**Where to look in the instrument**\n\n- The legal authority used is subregulation 39.001(1) (stated at the start of the instrument). The full list of ADs being revoked and re‑made appears in Schedule 1. The Note immediately beneath the signature states that each remade AD is in the same form as the latest published edition.\n\n**Bottom line**\n\n- This instrument is an administrative re‑issue: it revokes a batch of named ADs for Eurocopter AS 355 helicopters and re‑issues each as a separate instrument without changing the substance of the ADs themselves. Operators and maintenance providers should check that their references and compliance records point to the newly issued AD instruments, but their technical obligations remain the same."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a pure remaking exercise under subregulation 39.001(1) of CASR 1998. The scope remains identical to the original intent — maintaining airworthiness of Eurocopter AS 355 helicopters. The Note explicitly states each AD is being re-made 'in exactly the same form' as previously published. No expansion of regulatory scope has occurred."},"complexity_factors":["Single operative provision with straightforward binary action (revoke and remake)","No defined terms section — relies entirely on external references to existing ADs","Minimal conditional logic (simple 'and' structure in subregulation 39.001(1))","Schedule 1 is purely tabular/declarative with no substantive legal text","Heavy reliance on incorporated documents (the attached ADs themselves, which are not reproduced)","No cross-references to other legislation beyond the enabling regulation","Short total length (approximately 1 page of operative text plus schedule)"],"plain_english_summary":"This CASA order cancels all existing Airworthiness Directives for the Eurocopter AS 355 and remakes them as 83 separate, legally binding instruments. Most are reissued unchanged; a number are marked \"CANCELLED\" and no longer apply.\n\nIt’s a regulatory housekeeping move affecting Australian owners, operators, maintenance providers and CASA—consolidating ADs for clearer legal authority and enforcement without altering the underlying safety requirements."},"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-eurocopter-as-355-twin-ecureuil-series-helicop","history":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-eurocopter-as-355-twin-ecureuil-series-helicop/history","analysis":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-eurocopter-as-355-twin-ecureuil-series-helicop/analysis","conflicts":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-eurocopter-as-355-twin-ecureuil-series-helicop/conflicts","importantCases":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-eurocopter-as-355-twin-ecureuil-series-helicop/important-cases","documents":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-eurocopter-as-355-twin-ecureuil-series-helicop/documents"}}