{"id":"F2006B07846","name":"Airworthiness Directives 2004 - Revocation and Remaking - Douglas DC4 Series Aeroplanes","slug":"airworthiness-directives-2004-revocation-and-remaking-douglas-dc4-series-aeroplanes","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50791,"registerId":"commonwealth-F2006B07846-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 - Douglas DC4 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\nDouglas DC4 Series Aeroplanes\n\nAD Name AD Number\n\nVacuum System - Modification AD/DC4/1\n\nUndercarriage Door Stud - Replacement AD/DC4/2\n\nMain Fuel Line, Support Brackets in Wing - Replacement AD/DC4/3\n\nGoodyear 20DHBM Type Wheels - Flange Replacement AD/DC4/4\n\nCap Bolts - Replacement AD/DC4/5\n\nFuel Transfer Placard - Installation AD/DC4/6\n\nTail Pipe Shroud Deflector - Installation AD/DC4/7\n\nOxygen Regulator - Relocation AD/DC4/8\n\nHydraulic Hand Pump - Modification AD/DC4/9\n\nHydraulic Accumulator - Replacement AD/DC4/10\n\nVertical Stabiliser Attachment Fittings, AN Type Bolts - Replacement AD/DC4/11\n\nMain Undercarriage Door - Rework AD/DC4/12\n\nCabin Ventilator Exhaust - Rework AD/DC4/13\n\nFront Anti-Drag Mount - Rework AD/DC4/14\n\nAnti-Drag Position Stud - Revision AD/DC4/15\n\nTailplane Outer Hinge Bracket - Modification AD/DC4/16\n\nNose Wheel Retracting Cylinder - Modification AD/DC4/17\n\nGust Lock Safety Latch - Installation AD/DC4/18\n\nControl Surface Bonding - Revision AD/DC4/19\n\nRudder Gust Lock Bolt Guard - Installation AD/DC4/20\n\nControl Surface Attachment - Modification AD/DC4/21\n\nBus Bar Protector Plate - Installation AD/DC4/22\n\nGenerator Field Lead - Modification AD/DC4/23\n\nPropeller De-Icing System - Modification AD/DC4/24\n\nSpar Web - Modification AD/DC4/25\n\nFeathering Pump Line - Replacement AD/DC4/26\n\nMagneto Wire Re-Routing AD/DC4/27\n\nFire Protection Modifications AD/DC4/28\n\nFire Detector Guard - Installation AD/DC4/29\n\n  \nElectric Generator Fan - Removal AD/DC4/30\n\nPropeller Feathering System - Modification AD/DC4/31\n\nMaster Ignition Switch - Modification AD/DC4/32\n\nNose Wheel Brace Strut Collar - Inspection AD/DC4/33\n\nElectrical Distribution Bus AD/DC4/34 Amdt 1\n\nFloor Beam to Rear Spar Frame Attachment Angle - Inspection AD/DC4/35\n\nNose Gear Yoke End Fitting - Inspection and Replacement AD/DC4/36\n\nSpar Web - Inspection AD/DC4/37\n\nLower Main Plane Stringers Inspection AD/DC4/38\n\nAircraft Flight Manual, Flight into Icing Conditions AD/DC4/39 Amdt 1","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument does not change the substantive scope or requirements of the listed Airworthiness Directives. It revokes the existing instruments and reissues each Directive in identical form (see note: \"Each attached Airworthiness Directive is being re-made in exactly the same form as appears in the latest published edition of the Directive\"), so legal obligations and affected parties remain the same."},"complexity_factors":["Procedural action only (revocation and re‑making) rather than substantive regulatory change","Authority exercised under a specific regulation (subregulation 39.001(1)) requiring legal-form precision","Large list of separate Airworthiness Directives in Schedule 1 increases administrative scope","Obligations remain unchanged but compliance burden persists for multiple stakeholders (owners, operators, maintainers)","Potential need for administrative updates to recordkeeping and enforcement to reflect separate instruments"],"plain_english_summary":"This instrument revokes a list of Airworthiness Directives for Douglas DC‑4 series aeroplanes and reissues each Directive as a separate, identical instrument. The CASA delegate acts under subregulation 39.001(1) to perform the revocation and remaking (see Schedule 1).\n\nOwners, operators and maintenance organisations remain subject to the same mandatory safety requirements and bear any compliance and maintenance costs. The change is administrative: it preserves existing obligations while converting each Directive into a standalone legal instrument."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a pure administrative remaking exercise. The note explicitly states each directive is being re-made 'in exactly the same form as appears in the latest published edition.' There is no expansion of scope, no new requirements, and no policy change. The instrument maintains the existing regulatory footprint for DC-4 aircraft."},"complexity_factors":["Very short instrument (under 2 pages) with minimal operative text","Only one substantive legal mechanism: revocation and remaking under a single regulation (subregulation 39.001(1))","No defined terms section - relies on external understanding of 'Airworthiness Directive' and aircraft terminology","Simple tabular schedule listing 39 directives by name and number only","No conditional logic, exceptions, or nested provisions","Cross-references limited to the attached schedules (not reproduced in text)","Straightforward administrative action with no substantive policy changes (note confirms directives are re-made 'in exactly the same form')"],"plain_english_summary":"This CASA order revokes existing Airworthiness Directives for Douglas DC‑4 aircraft and reissues them as 39 separate, legally binding safety instructions. It affects owners, operators and maintenance personnel of DC‑4s in Australia by resetting mandatory compliance under current law. The action preserves the enforceability of long‑standing safety requirements for these vintage aircraft, helping ensure they remain safe and legally airworthy."},"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-douglas-dc4-series-aeroplanes","history":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-douglas-dc4-series-aeroplanes/history","analysis":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-douglas-dc4-series-aeroplanes/analysis","conflicts":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-douglas-dc4-series-aeroplanes/conflicts","importantCases":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-douglas-dc4-series-aeroplanes/important-cases","documents":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-douglas-dc4-series-aeroplanes/documents"}}