{"id":"F2006B11155","name":"AD/LEARJET/38 - Main Landing Gear Tyre","slug":"ad-learjet-38-main-landing-gear-tyre","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56847,"registerId":"commonwealth-F2006B11155-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)\n\n![](image.001.png)  \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\nGates Learjet 24 & 25 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/LEARJET/38 Main Landing Gear Tyre 7/2","sectionType":"part","heading":"AD/LEARJET/38 Main Landing Gear Tyre 7/2001","content":"# AD/LEARJET/38 Main Landing Gear Tyre 7/2001\n\nDM\n\nApplicability: All Model 23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A,\n\n25B, 25C, 25D, and 25F aircraft, fitted with Goodyear main landing gear tyre(s) part number 178K23-5 within the serial number range of 0148xxxx through 0152xxxx.\n\nRequirement: Perform a general visual inspection of the main landing gear tyres to determine if any tyre has Goodyear part number 178K23-5 within the serial number range of 0148xxxx through 0152xxxx, in accordance with Bombardier (Learjet) Advisory Wire 32-021, dated 5 February 2001.\n\nReplace, before further flight, any tyre that has Goodyear part number 178K23-5 and is within the serial number range specified in the inspection criteria.\n\nNote 1: FAA AD 2001-07-11 Amdt 39-12177 refers.\n\nNote 2: Goodyear Service Bulletin GY SB 2001-32-001 refers.\n\nNote 3: If any tyre has part number 178K23-5 but its serial number is not in the range 0148xxxx through 0152xxxx, no further action is required by this Directive.\n\nCompliance: Before 28 May 2001, unless already accomplished.\n\nThis Airworthiness Directive becomes effective on 23 May 2001.\n\nBackground: The main landing gear tyre manufacturer reported that certain Goodyear Flight Eagle tyres have experienced tread separation. Approximately 300 tyres have been identified as possibly defective.\n\n![Signature of David Alan Villiers Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 16 May 2001\n\n![](image.001.png)","sortOrder":1}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope: addressing a specific safety defect in a specific tyre model on specific aircraft. The scope has not expanded beyond the original safety issue of tread separation in the identified Goodyear tyres."},"complexity_factors":["Single, clearly defined applicability section with specific aircraft models and tyre part/serial numbers","Straightforward two-step requirement: visual inspection followed by conditional replacement","No nested exceptions or complex conditional logic — only one clear exemption (tyres with correct part number but outside serial range require no action)","Single compliance deadline with no alternative compliance methods or phased implementation","Minimal cross-referencing (only advisory notes pointing to related FAA directive and manufacturer bulletins for context, not for compliance)","No defined terms section — all technical terms are self-explanatory or standard aviation terminology"],"plain_english_summary":"This CASA safety order requires owners and operators of certain Gates Learjet 24/25 series fitted with Goodyear main landing gear tyres (part 178K23‑5, serials 0148xxxx–0152xxxx) to inspect and, if matched, immediately replace those tyres before further flight.  \n\nIssued because the manufacturer reported tread separation on affected tyres—about 300 potentially defective units—this action removes a serious landing‑gear safety risk. Compliance deadline: 28 May 2001."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive confines its scope to the identified tyre part number and serial-number range on listed Learjet models to address the reported tread-separation defect. It does not expand obligations beyond inspecting and replacing tyres in that identified batch, so the scope remains aligned with the stated safety purpose."},"complexity_factors":["Narrow applicability: specific aircraft models and a single tyre part number with a defined serial-number range","Single required action type: general visual inspection and replacement before next flight","Fixed compliance deadline (before 28 May 2001) creates time pressure for operators","Dependence on accurate tyre identification and serial-number traceability in operator records","References to external documents (Bombardier Advisory Wire, Goodyear Service Bulletin, FAA AD) create cross-reliance on other sources for implementation details","Regulatory enforcement discretion rests with CASA delegate but the directive mandates corrective action once a tyre is identified"],"plain_english_summary":"This Airworthiness Directive orders operators of specified Gates Learjet 23–25 series aeroplanes to inspect main landing gear tyres for Goodyear part number 178K23-5 with serial numbers in the 0148xxxx–0152xxxx range and to replace any affected tyre before further flight. It responds to reported tread separation in a batch of tyres.\n\nAircraft operators bear the cost and must carry out the visual check and any replacements; the Civil Aviation Safety Authority delegate issues and enforces the requirement, changing operator procedures immediately and setting a compliance deadline."}},"importantCases":[],"_links":{"self":"/api/acts/ad-learjet-38-main-landing-gear-tyre","history":"/api/acts/ad-learjet-38-main-landing-gear-tyre/history","analysis":"/api/acts/ad-learjet-38-main-landing-gear-tyre/analysis","conflicts":"/api/acts/ad-learjet-38-main-landing-gear-tyre/conflicts","importantCases":"/api/acts/ad-learjet-38-main-landing-gear-tyre/important-cases","documents":"/api/acts/ad-learjet-38-main-landing-gear-tyre/documents"}}