{"id":"F2006B07913","name":"Airworthiness Directives 2004 - Revocation and Remaking - Learjet 45 Series Aeroplanes","slug":"airworthiness-directives-2004-revocation-and-remaking-learjet-45-series-aeroplanes","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":50946,"registerId":"commonwealth-F2006B07913-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 - Learjet 45 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\nLearjet 45 Series Aeroplanes\n\nAD Name AD Number\n\nNose Wheel Squat Switch Assembly Lubrication AD/LJ45/1 Amdt 1\n\nBrake Control Unit Replacement AD/LJ45/2\n\nIce and Rain Protection AD/LJ45/3\n\nCockpit Foot Warmer AD/LJ45/4 Amdt 1\n\nHorizontal Stabiliser Actuator Assembly AD/LJ45/5\n\nHorizontal Stabiliser Actuator Assembly AD/LJ45/6\n\nMain Landing Gear Trunnion Shear Pins AD/LJ45/7","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The legislation maintains its original scope. The document explicitly states that each Airworthiness Directive is being re-made 'in exactly the same form as appears in the latest published edition of the Directive.' This is a procedural remaking under CASR 39.001(1), not an expansion of regulatory scope."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined term implicitly used (Airworthiness Directive, understood from context)","No conditional logic or nested exceptions","Simple binary structure: revoke (a) and remake (b)","Schedule 1 is a simple table with 7 entries","Single cross-reference to Civil Aviation Safety Regulations 1998 (subregulation 39.001(1)) — standard empowering provision","No substantive amendments to technical content — purely procedural remaking"],"plain_english_summary":"This document is an official order from the Civil Aviation Safety Authority (CASA) that **revokes and immediately remakes seven specific safety rules** for Learjet 45 series aircraft.\n\n**What it does:**\n- **Revokes** (cancels) seven existing Airworthiness Directives (ADs) — these are mandatory safety instructions that aircraft owners must follow to keep their planes airworthy (legal to fly).\n- **Remakes** those same seven directives as brand new, separate legal instruments.\n\n**Why this matters:**\nAirworthiness Directives are legally binding safety fixes. When CASA \"remakes\" them, it's usually to ensure they sit on the correct legal foundation or comply with updated regulatory procedures — even if the actual safety requirements haven't changed. The note confirms these are being reissued **exactly as they were**, with no changes to the technical content.\n\n**Who it affects:**\n- Owners and operators of **Learjet 45 series aeroplanes**\n- Maintenance organisations servicing these aircraft\n- Pilots flying these aircraft\n\n**The seven safety issues covered:**\n- Nose wheel squat switch lubrication\n- Brake control unit replacement\n- Ice and rain protection systems\n- Cockpit foot warmer\n- Horizontal stabiliser actuator assembly (two separate directives)\n- Main landing gear trunnion shear pins\n\nIn short: CASA is doing housekeeping on the paperwork for these safety rules, not changing what maintenance needs to be done."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument does not change the substantive scope or technical requirements of the listed Airworthiness Directives. It expressly revokes the listed ADs and re‑makes them as separate, attached instruments \"in exactly the same form as\" their latest published editions (Note; Schedule 1). The action is therefore administrative in form rather than a modification of coverage or obligations."},"complexity_factors":["Narrow subject matter: applies only to specified Airworthiness Directives for Learjet 45 series aeroplanes (Schedule 1).","Procedural action: instrument performs an administrative revoke-and-recreate rather than substantive policy change (Note).","Single statutory hook: action taken under one cited power (subregulation 39.001(1)), limiting legal inquiry to scope of that power.","Clear attachments: the substantive text of the ADs is contained in attached instruments (Schedule 1; Note), reducing interpretive ambiguity in this instrument itself."],"plain_english_summary":"A delegate of CASA revokes and re‑issues seven Airworthiness Directives for Learjet 45 series aeroplanes as separate instruments attached to this instrument. \n\nThe change is administrative: each AD is re‑made in the same form as its latest published edition, so operators, owners and maintenance organisations keep the same compliance obligations."}},"importantCases":[],"_links":{"self":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-learjet-45-series-aeroplanes","history":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-learjet-45-series-aeroplanes/history","analysis":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-learjet-45-series-aeroplanes/analysis","conflicts":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-learjet-45-series-aeroplanes/conflicts","importantCases":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-learjet-45-series-aeroplanes/important-cases","documents":"/api/acts/airworthiness-directives-2004-revocation-and-remaking-learjet-45-series-aeroplanes/documents"}}