{"id":"F2006B11125","name":"AD/LEARJET/1 - Horizontal Stabiliser - Inspection","slug":"ad-learjet-1-horizontal-stabiliser-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56800,"registerId":"commonwealth-F2006B11125-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/LEARJET/1 - Horizontal Stabiliser - 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/1 Horizontal Stabiliser - Inspection 6/73\n\nApplicability: All model 24 with S/Nos. 24-100 to 24-257 and model 25 with S/nos. 25-003 to 25-\n\n100.\n\n \n\nDocument: Gates Learjet SB No. 23/24/25 - 240. 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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive for specific aircraft serial numbers. It has not expanded beyond its original purpose of mandating a specific airframe inspection."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 2 defined applicability criteria (serial number ranges for two aircraft models)","Single cross-reference to one external technical document (manufacturer service bulletin)","No conditional logic, exceptions, or nested provisions","No interpretation section or defined terms","Straightforward compliance requirement ('As detailed in the requirement document')"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:** It requires owners and operators of specific Gates Learjet aircraft to inspect the **horizontal stabiliser** (the small wing at the tail of the plane that controls up-and-down movement) according to instructions in a manufacturer service bulletin.\n\n**Who it affects:**\n- **Learjet Model 24** aircraft with serial numbers 24-100 through 24-257\n- **Learjet Model 25** aircraft with serial numbers 25-003 through 25-100\n\n**Why it matters:** Airworthiness Directives are legally binding safety instructions. If you own or operate one of these specific aircraft, you **must** complete this inspection to keep your aircraft legally airworthy. Failing to comply means you cannot fly the aircraft.\n\n**What you need to do:** Follow the inspection procedures detailed in **Gates Learjet Service Bulletin No. 23/24/25-240**."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The text provided sets out the scope (specific Model 24 and 25 serial numbers) and mandates compliance with a named Gates Learjet Service Bulletin (Applicability; Document; Compliance). There is no indication in this excerpt that the scope has been expanded or narrowed from an earlier instrument; the AD as presented applies only to the serial number ranges listed and refers operators to the service bulletin for the required inspection steps."},"complexity_factors":["Limited text: the AD itself is short and primarily references an external service bulletin rather than providing technical steps.","Serial‑number specificity: applicability is narrow and defined by specific serial number ranges, which simplifies identifying affected aircraft (Applicability).","External dependency: substantive inspection procedures and corrective actions are contained in the referenced service bulletin, creating a cross‑document dependency (Document; Compliance).","Regulatory binding: although short, the AD converts the external document’s content into a mandatory requirement, which has legal force and compliance implications.","Lack of embedded enforcement detail: the AD does not include enforcement, timing, or penalty details in the excerpt, requiring consultation of further regulatory material if needed."],"plain_english_summary":"This airworthiness directive requires owners/operators of Gates Learjet Model 24 (S/N 24‑100 to 24‑257) and Model 25 (S/N 25‑003 to 25‑100) to carry out the horizontal stabiliser inspection set out in Gates Learjet Service Bulletin No. 23/24/25‑240.  \n\nCompliance with the service bulletin is mandatory under the AD; affected operators must arrange inspections and any corrective work and will bear the associated costs and downtime."}},"importantCases":[],"_links":{"self":"/api/acts/ad-learjet-1-horizontal-stabiliser-inspection","history":"/api/acts/ad-learjet-1-horizontal-stabiliser-inspection/history","analysis":"/api/acts/ad-learjet-1-horizontal-stabiliser-inspection/analysis","conflicts":"/api/acts/ad-learjet-1-horizontal-stabiliser-inspection/conflicts","importantCases":"/api/acts/ad-learjet-1-horizontal-stabiliser-inspection/important-cases","documents":"/api/acts/ad-learjet-1-horizontal-stabiliser-inspection/documents"}}