{"id":"F2006B11161","name":"AD/LEARJET/9 - Spoiler Actuator Bracket And Bushing - Inspection","slug":"ad-learjet-9-spoiler-actuator-bracket-and-bushing-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56857,"registerId":"commonwealth-F2006B11161-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/LEARJET/9 - Spoiler Actuator Bracket And Bushing - 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/9 Spoiler Actuator Bracket And Bushing - Inspection\n\n\n5/75\n\n \n\nApplicability: All model 24 with S/Nos. 24-269 to 24-312, all model 25 with S/Nos. 25-115 to 25- 186, and other aeroplanes with Kit No. AMK 73-1 fitted.\n\n \n\nDocument: Gates Learjet SB 24/25-261.\n\n \n\nCompliance: Within 100 hours time in service after 30 June 1975.\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":2,"scope_assessment":{"changed":false,"description":"Based on the text provided, the directive sets a clear, limited scope: specified Learjet model/serial numbers and aeroplanes fitted with Kit No. AMK 73-1, requiring an inspection per the named service bulletin within a fixed time window. There is no indication in this document that the scope has been altered from its stated applicability and compliance requirement."},"complexity_factors":["Narrow, clearly defined applicability by model and serial number reduces scope complexity.","Single required action (inspection) keeps procedural complexity low.","Fixed and short compliance window (100 hours after 30 June 1975) is straightforward to interpret but operationally constraining.","Dependence on an external manufacturer service bulletin (Gates Learjet SB 24/25-261) introduces procedural dependency and potential detail outside this text.","The AD does not specify corrective actions or sanctions in this excerpt, creating an area of operational ambiguity to be resolved by the referenced document or by operator maintenance practice."],"plain_english_summary":"What this instrument requires\n\n- It mandates an inspection of the spoiler actuator bracket and bushing on certain Gates Learjet aeroplanes. The inspection requirement is set out as an Airworthiness Directive under Part 39 (Schedule of Airworthiness Directives).\n\nWho is affected\n\n- Owners/operators of Learjet model 24 with serial numbers 24-269 to 24-312 and model 25 with serial numbers 25-115 to 25-186. It also applies to other aeroplanes that have Kit No. AMK 73-1 fitted (\"Applicability\").\n\nHow it works, mechanically\n\n- The directive requires that the inspection be carried out in accordance with Gates Learjet Service Bulletin 24/25-261 (\"Document: Gates Learjet SB 24/25-261\").\n- The inspection must be completed within 100 hours time in service after 30 June 1975 (\"Compliance\").\n\nWho pays and who decides\n\n- The instrument places the obligation on the operator/owner of each listed aeroplane to arrange and ensure the inspection is carried out within the specified time. The directive points to the manufacturer service bulletin for the inspection method (\"Document: Gates Learjet SB 24/25-261\").\n\nIncentives, costs and compliance burden\n\n- The direct costs are the labour and any parts or follow-on work that result from the inspection findings; those costs fall to the aircraft owner/operator since they must arrange compliance (inferred from the requirement to comply within the stated timeframe).\n- The compliance burden is scheduling and performing the inspection within the 100 hours time-in-service window after 30 June 1975; the directive does not set out corrective actions or costs in this text (only the inspection requirement and the referenced service bulletin are listed).\n\nDiscretion and implementation risk\n\n- The AD requires following the referenced service bulletin for the inspection method, which narrows technical discretion but leaves the owner/operator to implement and, if necessary, to arrange any corrective work indicated by the inspection (\"Document: Gates Learjet SB 24/25-261\").\n- The directive is narrowly targeted by serial number and kit fitment, so it concentrates compliance obligations on a defined group of aircraft (\"Applicability\").\n\nTrade-offs and operational effects\n\n- Operators must allocate maintenance time within the specified 100-hour window, which produces aircraft downtime and opportunity cost for scheduled flights. The AD does not itself describe corrective measures or costs; those are expected to follow the inspection results and the procedures in the referenced service bulletin.\n\nSource citations: applicability, document reference and compliance timeframe are taken directly from the AD text (Applicability; Document: Gates Learjet SB 24/25-261; Compliance: Within 100 hours time in service after 30 June 1975)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive with a narrow, specific scope. It addresses a single mechanical issue on specific aircraft models and does not represent scope creep from any broader legislative intent."},"complexity_factors":["Very short document (approximately 200 words)","Only 4 defined elements: applicability criteria, reference document, compliance deadline, and action required","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","Simple conditional logic: if aircraft matches serial numbers or has specific kit, then inspection required","Single compliance pathway with clear deadline","No nested exceptions or conditional sub-clauses"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA). It mandates a safety inspection for specific Gates Learjet aircraft.\n\n**What it does:**\n- Requires owners/operators of certain Learjet 24 and 25 series aircraft to inspect the **spoiler actuator bracket and bushing** — these are mechanical parts that help control the aircraft's spoilers (flight control surfaces on the wings that disrupt airflow to reduce lift or increase drag).\n\n**Who it affects:**\n- Specific Learjet Model 24 aircraft with serial numbers 24-269 through 24-312\n- Specific Learjet Model 25 aircraft with serial numbers 25-115 through 25-186\n- Any other aircraft that have been modified with **Kit No. AMK 73-1**\n\n**What must be done:**\n- The inspection must follow the procedures outlined in **Gates Learjet Service Bulletin 24/25-261** (a technical notice from the manufacturer)\n- **Deadline:** Within 100 hours of flight time after 30 June 1975\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety orders. They are issued when a safety defect or unsafe condition is discovered in an aircraft type. Failing to comply means the aircraft cannot legally fly in Australian airspace. This particular directive addresses potential structural or mechanical issues with spoiler components that could affect flight safety."}},"importantCases":[],"_links":{"self":"/api/acts/ad-learjet-9-spoiler-actuator-bracket-and-bushing-inspection","history":"/api/acts/ad-learjet-9-spoiler-actuator-bracket-and-bushing-inspection/history","analysis":"/api/acts/ad-learjet-9-spoiler-actuator-bracket-and-bushing-inspection/analysis","conflicts":"/api/acts/ad-learjet-9-spoiler-actuator-bracket-and-bushing-inspection/conflicts","importantCases":"/api/acts/ad-learjet-9-spoiler-actuator-bracket-and-bushing-inspection/important-cases","documents":"/api/acts/ad-learjet-9-spoiler-actuator-bracket-and-bushing-inspection/documents"}}