{"id":"F2006B11164","name":"AD/LJ45/3 - Ice and Rain Protection","slug":"ad-lj45-3-ice-and-rain-protection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56861,"registerId":"commonwealth-F2006B11164-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)\n\nLearjet 45 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/LJ45/3 Ice and Rain Protection 6/2002","sectionType":"part","heading":"AD/LJ45/3 Ice and Rain Protection 6/2002","content":"# AD/LJ45/3 Ice and Rain Protection 6/2002\n\nApplicability: Learjet 45 series aeroplanes as listed by serial number in Bombardier (Learjet) Service Bulletin (SB) A45-30-2, and not incorporating the requirements of Section 2 Accomplishment Instructions of Bombardier (Learjet) SB A45-30-2.\n\nRequirement: 1. Flight Manual: Revise the limitations section of the FAA approved Aircraft flight manual (AFM) by replacing the existing information in the “TYPE OF OPERATION” section with the following:\n\n“This airplane is approved for:\n\n    VFR (Visual)\n    IFR (Instrument)\n    Day\n    Night\n\nFlight into icing conditions is prohibited. If icing conditions are encountered, comply with the Inadvertent Icing Encounter procedure, Section IV. Fly out of icing conditions as soon as possible.\n\nIcing conditions exist when outside air temperature (OAT) on the ground and for takeoff is 10°C (50°F) or below, or the static air temperature (SAT) in flight is 10°C (50°F) to -40°C (-40°F), and visible moisture in any form is present (such as clouds, fog with visibility of one mile (1.6 km) or less, rain, snow, sleet, or ice crystals).\n\nIcing conditions also exist when the OAT on the ground and for takeoff is 10°C (50°F) or below when operating on ramps, taxiways, or runways where surface snow, ice, standing water, or slush may be ingested by the engines, or freeze on engines, nacelles, or engine sensor probes.\"\n\n    2. Inspection: Inspect the anti-ice manifold assembly in accordance with Bombardier (Learjet) SB A45-30-02.\n\n    3. Replacement: Replace the anti-ice manifold assembly in accordance with Bombardier (Learjet) SB A45-30-02.","sortOrder":1}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"Based on the text provided, the AD's scope is limited to Learjet 45 serial numbers listed in the referenced Bombardier service bulletin that have not incorporated the SB's Section 2. There is no indication in the instrument as supplied that the applicability was widened or narrowed beyond that listing."},"complexity_factors":["Cross-reference to manufacturer service bulletin (Bombardier SB A45-30-02 / A45-30-2) — requires following technical instructions external to the AD","Serial-number-specific applicability — applies only to aircraft listed in the SB and not already modified (limits population and requires record checks)","Operational limitation change — AFM revision prohibiting flight into icing affects operational planning and pilot decision-making","Maintenance actions (inspection and replacement) require qualified personnel, parts availability and workshop time — direct compliance cost and scheduling impact","Administrative coordination — revising an FAA-approved AFM may require regulatory/administrative steps with authorities or record-keeping","Technical definitions of 'icing conditions' in the AD create precise thresholds crews must apply in routine operations","No compliance time or deadline text included in the supplied excerpt increases uncertainty about when actions must be completed"],"plain_english_summary":"This Airworthiness Directive requires operators of specified Learjet 45 serial numbers (those listed in Bombardier Service Bulletin A45-30-2 that have not incorporated Section 2) to revise the Aircraft Flight Manual to prohibit flight into icing, to inspect the anti-ice manifold assembly, and to replace that assembly if required, following Bombardier SB A45-30-02. It affects owners, operators and maintenance organisations, who must update manuals, carry out inspections and install parts per the manufacturer’s instructions and bear the direct compliance costs."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific unsafe icing protection condition in Learjet 45 aircraft. The requirements align precisely with the stated safety purpose: preventing flight into icing conditions through operational restrictions and hardware modifications. No scope creep is evident."},"complexity_factors":["Single specific aircraft type (Learjet 45 series) with defined serial numbers","Three distinct but straightforward requirements (documentation update, inspection, replacement)","References external technical document (Bombardier Service Bulletin A45-30-2) without reproducing its contents","Clear conditional applicability (applies only to aircraft not already modified per Section 2 of the SB)","No nested exceptions or complex conditional logic","Standard AD structure with clearly labeled sections (Applicability, Requirement, Compliance)","Technical aviation terminology present but used in standard operational context"],"plain_english_summary":"This mandatory CASA Airworthiness Directive applies to certain Learjet 45s and requires adding a flight‑manual warning that the aircraft must not be flown into icing conditions until a hardware fix is done. It also mandates inspection and replacement of the anti‑ice manifold assembly (per Bombardier SB A45‑30‑2).\n\nIt affects owners, operators, pilots and maintenance personnel because it reduces operational capability in icing and addresses a critical ice‑protection safety risk."}},"importantCases":[],"_links":{"self":"/api/acts/ad-lj45-3-ice-and-rain-protection","history":"/api/acts/ad-lj45-3-ice-and-rain-protection/history","analysis":"/api/acts/ad-lj45-3-ice-and-rain-protection/analysis","conflicts":"/api/acts/ad-lj45-3-ice-and-rain-protection/conflicts","importantCases":"/api/acts/ad-lj45-3-ice-and-rain-protection/important-cases","documents":"/api/acts/ad-lj45-3-ice-and-rain-protection/documents"}}