{"id":"F2006B07945","name":"Airworthiness Directives 2004 - Revocation and Remaking - Pilatus Britten Norman BN2A Mk III (Trislander) Series Aeroplanes","slug":"airworthiness-directives-2004-revocation-and-remaking-pilatus-britten-norman-bn2a-mk-iii-trislander-","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":51016,"registerId":"commonwealth-F2006B07945-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 - Pilatus Britten Norman BN2A Mk III (Trislander) Series Aeroplanes","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\nPilatus Britten Norman BN2A Mk III (Trislander) Series Aeroplanes\n\nAD Name AD Number\n\nRudder Trim Jack Lower Mounting Bracket - Inspection and Modification AD/BNT/1\n\nAileron Mass Balance Attachment - Inspection and Modification AD/BNT/2\n\nFlap Drive Pick Up Bracket AD/BNT/3 Amdt 1\n\nRudder Bar Assembly - Modification AD/BNT/4 Amdt 2\n\nFlap Hinge Attachments - Inspection and Modification AD/BNT/5\n\nEngine Mounting Frames - Inspection AD/BNT/6 Amdt 1\n\nPilots Seats Locking Mechanism - Inspection and Modification AD/BNT/7\n\nWoodward Propeller Governor Drive Shaft - Inspection and Replacement AD/BNT/8\n\nElevator Trim Tab Cables - Replacement AD/BNT/9\n\nElevator Torque Tube - Inspection and Rework AD/BNT/10\n\nWing Bottom Surface Lamination Sta. 112 - Modification AD/BNT/11 Amdt 1\n\nRear Fuselage Undersurface - Modification AD/BNT/12\n\nCANCELLED AD/BNT/13 Amdt 2\n\nHartzell Propeller Blades Installed on Centre Engine - Removal AD/BNT/14\n\nUndercarriage Lower Bracket and Attachment - Engine Nacelle Area - AD/BNT/15 Amdt 2\n\nRudder Bar Lower Mounting - Inspection and Modification AD/BNT/16\n\nAirframe Structural Fatigue Life Limitations AD/BNT/17 Amdt 2\n\nEngine Mounting Brackets - Inspection AD/BNT/18\n\nPassenger Seats - Inspection and Modification AD/BNT/19\n\nMain Undercarriage Leg Outer Casing - Inspection AD/BNT/20\n\nFlight Compartment Seat Back - Inspection and Modification AD/BNT/21\n\nAileron Mass Balance Tube - Inspection AD/BNT/22\n\nPropeller Governors - Inspection and Adjustment - CANCELLED AD/BNT/23 Amdt 1\n\nRudder Stop Structure - Inspection and Modification AD/BNT/24\n\nElevator and Flap Control Rods - Inspection AD/BNT/25 Amdt 1\n\nEngine Fire Warning - Modification AD/BNT/26\n\nRudder Mass Balance Arm Support Brackets - Inspection AD/BNT/27\n\nMain Undercarriage Leg Tube - Inspection and Modification AD/BNT/28\n\nTailplane Attachment Bracket and Rear Pod Structure - Inspection AD/BNT/29\n\n  \nCANCELLED AD/BNT/30\n\nEngine Controls Attachment Brackets - Modification AD/BNT/31\n\nUndercarriage Shock Absorber Support Ring - Inspection and Rectification AD/BNT/32\n\nEngine Control Shaft - Inspection AD/BNT/33\n\nWing Mounted Engine Upper Mounting Brackets AD/BNT/34 Amdt 2\n\nWing/Fuselage Attachment Pins - Inspection AD/BNT/35\n\nWing Tip Tank Fuel Contents Transmitter Floats - Inspection AD/BNT/36\n\nPrimary Structure Corrosion AD/BNT/37 Amdt 2\n\nPilots Switch Panel AD/BNT/38\n\nNose Wheel Steering Drive Ring - CANCELLED AD/BNT/39\n\nMain Landing Gear Torque Link AD/BNT/40\n\nGenerator Inspection AD/BNT/41\n\nWing Spar Cap AD/BNT/42\n\nNLG Leg Cylinder Bearing Surfaces AD/BNT/43\n\nNose Wheel Steering Drive-Ring AD/BNT/44 Amdt 1\n\nControl Column Sliding Tube AD/BNT/45 Amdt 1\n\nThrottle Friction Adjuster AD/BNT/46 Amdt 1\n\nMain Landing Gear Oleo Attachment Bracket AD/BNT/47 Amdt 4\n\nEmergency Exit Window AD/BNT/48\n\nEngine Mounting Brackets AD/BNT/49 Amdt 1\n\nRear Engine Mounting Frame NB-51-H-1021 AD/BNT/50\n\nLeft and Right Rudder Bar Pillar and Slider Tube Assemblies AD/BNT/51\n\nControl Column Universal Joint AD/BNT/52\n\nAccess Panel Bolts AD/BNT/53 Amdt 1\n\nFHL Landing Gear Units AD/BNT/54\n\nFolding Passenger Seat Rear Frame AD/BNT/55\n\nControl Cable Swivel Unit Mounting Bracket AD/BNT/56","sortOrder":0}],"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":3,"scope_assessment":{"changed":false,"description":"This instrument does not change the substantive scope of the ADs. It is an administrative revocation of a consolidated set of Airworthiness Directives and the re-issue of each directive as a separate instrument in the same form as the latest published edition. The technical requirements and the set of obligations on operators are intended to remain the same; therefore the regulatory scope has not been expanded beyond the original ADs' purposes. The principal change is organisational (how the ADs are published and cited), not substantive."},"complexity_factors":["Single, short instrument performing an administrative action rather than substantive rulemaking","Large number of ADs listed (approximately 56 entries in Schedule 1), requiring operators to consult multiple separate instruments","Some entries show amendment history (e.g. \"Amdt 1\", \"Amdt 2\", \"Amdt 4\"), adding minor complexity to tracing the operative text","A few items in the Schedule are marked CANCELLED, so users must check which ADs remain active","Cross-reference to a single regulation (subregulation 39.001(1)) rather than multiple statutory provisions, limiting legal cross-referencing","Dependency on attached ADs (the instrument remakes each AD as a separate instrument), so full detail requires consulting those attached/individual AD instruments"],"plain_english_summary":"**What this instrument does (mechanically)**\n\n- A delegate of the Civil Aviation Safety Authority (CASA) used the power in subregulation 39.001(1) of the Civil Aviation Safety Regulations 1998 to cancel (revoke) a set of airworthiness directives that had previously been issued together, and to re-issue each of those directives as an individual legal instrument. (See subregulation 39.001(1) and Schedule 1.)\n- The instrument states each re-issued Airworthiness Directive (AD) is being re-made \"in exactly the same form as appears in the latest published edition of the Directive.\" That means the technical requirements in the ADs are not changed here; they are simply split out and re-published as separate instruments.\n\n**Who this affects**\n\n- Owners and operators of Pilatus Britten Norman BN2A Mk III (Trislander) series aircraft. They must comply with the ADs that apply to their aeroplanes.\n- Maintenance organisations, mechanics and approved engineers who perform inspections, modifications or replacements required by those ADs.\n- CASA and its delegate who administer and enforce compliance, and keep the AD register.\n\n**Why it matters (practical effects)**\n\n- Legal continuity: The safety obligations created by the listed ADs continue in force, but each obligation now appears as a separate legal instrument rather than as part of a consolidated publication. Operators must therefore refer to the individual AD instruments when checking requirements and compliance dates. (See Schedule 1 for the list of ADs re-made.)\n- Administrative impact: There is no substantive change to the technical or compliance content of the ADs — the instrument explicitly remakes them in the same form. The main effects are administrative: updating maintenance manuals, compliance records, procedure checklists and any automated compliance-tracking systems to reference the new individual AD instrument numbers instead of the prior consolidated document.\n\n**Concrete mechanics and behaviour changes**\n\n- Who decides: a CASA delegate acted under the cited regulation to revoke and re-make the ADs (subregulation 39.001(1)).\n- Who pays: aircraft operators and maintenance providers bear the ordinary costs of complying with each AD (inspections, modifications, part replacements, record-keeping). CASA bears the administrative cost of revoking and reissuing the instruments and updating registers.\n- What operators must do differently: look up and comply with the separately-issued AD(s) that apply to their aircraft; update internal references and records to the new individual AD instrument numbers. Where an AD is listed as \"CANCELLED\" in Schedule 1, operators should treat that AD as no longer applicable (confirm by checking the re-made instruments or CASA records).\n\n**Implementation risks, costs and trade-offs**\n\n- Compliance burden: The technical obligations and compliance costs imposed by each AD remain unchanged. The only likely incremental cost is administrative — time spent by operators and maintenance providers to update references, procedures and records.\n- Information-friction trade-off: splitting ADs into separate instruments can make it easier to find and manage a single AD (improves granularity), but it can also fragment a previously consolidated document and require re-checking multiple instruments for a complete compliance picture. The instrument itself makes no substantive changes to requirements; any risk is to administrative clarity rather than legal effect. (Schedule 1 shows many ADs were re-made individually; some entries are marked as cancelled or show amendment history.)\n- Enforcement and discretion: enforcement powers, compliance timelines and technical content are not changed by this administrative step. The action was taken by a CASA delegate under an existing regulatory power, so the scope of bureaucratic discretion exercised here is the statutory power to make ADs and instruments under subregulation 39.001(1).\n\n**Source's stated purpose, then tested against costs and implementation**\n\n- Source claim: the ADs are being re-made precisely as published, so the stated purpose is administrative re-issue rather than substantive amendment.\n- Tested against costs and incentives: that claim implies minimal policy change and minimal new compliance cost. In practice the primary costs are operator and maintainer administrative updates and brief transition risk of referencing the wrong instrument; the benefits are clearer instrument-level legal citation and possibly easier individual dissemination of ADs. There is no evidence in the text of new technical requirements, new fees, or changed enforcement mechanisms."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"The legislation maintains its original scope. It is purely administrative — revoking and remaking existing airworthiness directives without expanding, contracting, or altering their substantive safety requirements. The cancelled directives (13, 23, 30) appear to have been previously deactivated and are now formally removed, but this does not represent scope creep."},"complexity_factors":["Very short document (under 2 pages)","Simple binary structure: revoke old, make new","No defined terms section — uses plain language","No conditional logic or nested exceptions","Cross-references limited to a schedule table listing 56 ADs by number and title","Single operative provision with straightforward delegation chain (CASA delegate acting under one subregulation)","Note clarifies no substantive change to technical content"],"plain_english_summary":"This CASA order revokes and reissues 56 Airworthiness Directives for the Pilatus Britten Norman BN2A Mk III (Trislander), remaking them in the same form to ensure they remain legally enforceable under current authority. It’s a legal housekeeping move that preserves existing mandatory safety obligations without changing technical requirements.\n\nIt affects Trislander owners, operators and maintenance engineers; three directives (AD/BNT/13, AD/BNT/23, AD/BNT/30) are revoked and not re-made, so those specific requirements are cancelled."}},"importantCases":[],"_links":{"self":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-pilatus-britten-norman-bn2a-mk-iii-trislander-","history":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-pilatus-britten-norman-bn2a-mk-iii-trislander-/history","analysis":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-pilatus-britten-norman-bn2a-mk-iii-trislander-/analysis","conflicts":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-pilatus-britten-norman-bn2a-mk-iii-trislander-/conflicts","importantCases":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-pilatus-britten-norman-bn2a-mk-iii-trislander-/important-cases","documents":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-pilatus-britten-norman-bn2a-mk-iii-trislander-/documents"}}