{"id":"F2006B11132","name":"AD/LEARJET/16 - Secondary Yaw Damper Servo Cable Clamp Bolt - Inspection","slug":"ad-learjet-16-secondary-yaw-damper-servo-cable-clamp-bolt-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56814,"registerId":"commonwealth-F2006B11132-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/LEARJET/16 - Secondary Yaw Damper Servo Cable Clamp Bolt - 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/16 Secondary Yaw Damper Servo Cable\n\nClamp Bolt - Inspection\n\nApplicability: All model 25 with S/Nos. 25-003 to 25-249. Document:  Gates Learjet SB 25-285.\n\nCompliance: Within 100 hours time in service after 31 December 1978.\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\n \n\n\n10/78\n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive’s scope is confined to a clearly defined set of aircraft (Model 25, S/Ns 25-003 to 25-249) and to a single mandated action (inspection of the secondary yaw damper servo cable clamp bolt) to be completed within a stated time-in-service window (Applicability; Compliance). The instrument as presented does not expand beyond that stated applicability or task and therefore does not change scope from what it explicitly sets out (AD title; Applicability; Compliance; Document)."},"complexity_factors":["Narrow applicability limited to Model 25, S/N 25-003 to 25-249 (Applicability).","Single, one-off action (inspection) with a short, fixed compliance window (Compliance: Within 100 hours time in service after 31 December 1978).","Technical execution depends on an external service bulletin (Document: Gates Learjet SB 25-285), requiring access to that technical material.","Requirement involves calculating flight/engine time (‘time in service’) which can require record-checking.","Directive text does not include corrective action detail in-line; operators must consult the referenced service bulletin for procedure and potential remedial steps (Document)."],"plain_english_summary":"This AD mandates a one‑time inspection of the secondary yaw damper servo cable clamp bolt on Gates Learjet Model 25 aircraft (S/N 25‑003 to 25‑249), to be completed within 100 hours time‑in‑service after 31 Dec 1978 using Gates Learjet SB 25‑285. Owners/operators must arrange and pay for the inspection (and any repairs); it imposes short‑term costs and maintenance demand to address a specified safety concern."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-limited safety directive from 1978 addressing a specific mechanical defect in a specific aircraft model range. It has not expanded beyond its original narrow technical purpose."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 4 operative provisions: applicability, reference document, compliance deadline, and action required","No defined terms section — all language is plain technical aviation terminology","No cross-references to other legislation or regulations beyond the enabling authority (Civil Aviation Regulations 1998, Part 39)","Single, unambiguous compliance condition (time-based deadline)","No exceptions, exemptions, or conditional logic"],"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) that requires aircraft owners and operators to perform specific maintenance or inspections.\n\n**What it does:** It orders owners of specific **Gates Learjet 25 series aircraft** (serial numbers 25-003 through 25-249) to inspect a particular bolt on the **secondary yaw damper servo cable clamp**. The yaw damper is a system that helps keep the plane stable and prevents unwanted side-to-side movement (yaw) during flight.\n\n**Who it affects:** Anyone who owns or operates the affected Learjet 25 models — primarily private operators, charter companies, or corporate flight departments flying these specific aircraft.\n\n**What must be done:** The inspection must be completed **within 100 flight hours after 31 December 1978**, following the procedures in **Gates Learjet Service Bulletin 25-285** (the manufacturer's official maintenance instruction).\n\n**Why it matters:** Faulty or loose bolts in flight control systems can lead to reduced aircraft stability or loss of control. This directive ensures a potential safety defect is caught before it causes an accident."}},"importantCases":[],"_links":{"self":"/api/acts/ad-learjet-16-secondary-yaw-damper-servo-cable-clamp-bolt-inspection","history":"/api/acts/ad-learjet-16-secondary-yaw-damper-servo-cable-clamp-bolt-inspection/history","analysis":"/api/acts/ad-learjet-16-secondary-yaw-damper-servo-cable-clamp-bolt-inspection/analysis","conflicts":"/api/acts/ad-learjet-16-secondary-yaw-damper-servo-cable-clamp-bolt-inspection/conflicts","importantCases":"/api/acts/ad-learjet-16-secondary-yaw-damper-servo-cable-clamp-bolt-inspection/important-cases","documents":"/api/acts/ad-learjet-16-secondary-yaw-damper-servo-cable-clamp-bolt-inspection/documents"}}