{"id":"F2006B11129","name":"AD/LEARJET/13 - Spoiler System - Inspection","slug":"ad-learjet-13-spoiler-system-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56808,"registerId":"commonwealth-F2006B11129-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/LEARJET/13 - Spoiler System - Inspection","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Gates Learjet 24 & 25 Series Aeroplanes\n\n \n\nAD/LEARJET/13 Spoiler System - Inspection 9/75\n\nApplicability: All model 24 with S/Nos. 24-100 to 24-302 and 24-309 to 24-317, and all model 25\n\nwith S/Nos. 25-003 to 25-194. Document: Gates Learjet SB 23/24/25-265. Compliance:              As detailed in the requirement document.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The supplied text contains a single airworthiness directive identifying affected serial-numbered Learjet 24 and 25 aeroplanes and mandating compliance with Gates Learjet SB 23/24/25-265. No prior or alternative scope is provided in the supplied material, and there is no evidence within the excerpt of any change to the Directive’s scope. The AD’s operative scope is the serial-number lists under \"Applicability\" and the requirement to follow the referenced document under \"Compliance.\""},"complexity_factors":["The Directive is short and procedural but delegates all technical detail to an external service bulletin (Gates Learjet SB 23/24/25-265), requiring users to locate and apply that external document.","Applicability is limited to specific serial-number ranges, creating administrative complexity for operators to determine whether a particular airframe is captured.","The AD does not reproduce inspection intervals, acceptance criteria or corrective actions, so operational compliance depends on reading and interpreting the service bulletin.","Implementation requires coordination between aircraft owners, maintenance organisations and regulatory oversight, with potential aircraft downtime and parts/labour costs.","No cost, enforcement, or inspection-frequency data are included in the supplied text, increasing uncertainty for planning and budgeting."],"plain_english_summary":"This Airworthiness Directive makes the Gates Learjet Service Bulletin 23/24/25-265 mandatory for inspecting the spoiler system on specified Learjet 24 and 25 serial-numbered aircraft. It therefore requires owners/operators and maintenance organisations to obtain and carry out the referenced inspections and any corrective work. The AD does not itself set inspection steps, intervals or costs—those technical and cost details are in the service bulletin and fall to the operator."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-purpose airworthiness directive focused on a specific technical inspection. It has not expanded beyond its original scope of requiring spoiler system inspections on specific Learjet models."},"complexity_factors":["Very short document (approximately 150 words)","Only 4 defined elements: applicability (specific serial numbers), document reference, compliance requirement, and subject matter","No conditional logic or nested exceptions","Single cross-reference to manufacturer service bulletin","No interpretation section or defined terms","Straightforward command structure: identify affected aircraft, cite source document, require compliance"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of specific Gates Learjet 24 and 25 series aircraft to inspect their **spoiler systems**.\n\n**What it does:**\n- Mandates a safety inspection of the spoiler system (flight control surfaces that disrupt airflow to reduce lift and increase drag) on certain Learjet models\n- References a specific service bulletin (SB 23/24/25-265) from the manufacturer that contains the detailed inspection requirements\n\n**Who it affects:**\n- Owners and operators of:\n  - Learjet Model 24 aircraft with serial numbers 24-100 through 24-302, and 24-309 through 24-317\n  - Learjet Model 25 aircraft with serial numbers 25-003 through 25-194\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety orders. They are issued when unsafe conditions are found in aircraft, engines, or equipment. Compliance is mandatory—aircraft cannot legally fly until the required inspection is completed according to the manufacturer's specifications. This particular directive dates from September 1975 and addresses potential safety issues with the spoiler system that could affect flight control."}},"importantCases":[],"_links":{"self":"/api/acts/ad-learjet-13-spoiler-system-inspection","history":"/api/acts/ad-learjet-13-spoiler-system-inspection/history","analysis":"/api/acts/ad-learjet-13-spoiler-system-inspection/analysis","conflicts":"/api/acts/ad-learjet-13-spoiler-system-inspection/conflicts","importantCases":"/api/acts/ad-learjet-13-spoiler-system-inspection/important-cases","documents":"/api/acts/ad-learjet-13-spoiler-system-inspection/documents"}}