{"id":"F2006B11117","name":"AD/LEARJET 35/38 - Main Landing Gear Tyre","slug":"ad-learjet-35-38-main-landing-gear-tyre","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56783,"registerId":"commonwealth-F2006B11117-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.002.png)\n\n![](image.002.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.","sortOrder":0},{"sectionNumber":"AD/LEARJET 35/38 Main Landing Gear Tyre ","sectionType":"part","heading":"AD/LEARJET 35/38 Main Landing Gear Tyre 7/2001","content":"# AD/LEARJET 35/38 Main Landing Gear Tyre 7/2001\n\nDM\n\nApplicability: All Model 35, 35A, 36, and 36A 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\n![](image.003.png)Background: 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![](image.004.png)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 16 May 2001\n\n![](image.002.png)\n\nThe above AD is notified in the Commonwealth of Australia Gazette on 23 May 2001.","sortOrder":1}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope: addressing a specific safety defect in specific aircraft with specific tyres. It has not expanded beyond its original purpose of correcting the identified unsafe condition."},"complexity_factors":["Very short document (approximately 250 words)","Only 4 defined applicability criteria (aircraft models, tyre part number, serial number range)","Single straightforward requirement with clear conditional logic (if X and Y, then replace)","No cross-references to other legislation or regulations beyond a single enabling provision (CAR 1998 subregulation 39.1(1))","Simple compliance deadline with single exception (unless already accomplished)","Minimal defined terms — only standard aviation terminology used"],"plain_english_summary":"This AD orders operators of Learjet 35/35A/36/36A to inspect main landing gear tyres for Goodyear Flight Eagle part 178K23-5 with serials 0148–0152 and replace any found before the next flight (inspection/replacement due by 28 May 2001). It responds to reported tread separation on about 300 tyres — a serious takeoff/landing hazard — and prevents in‑service tyre failures."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive confines requirements to specific Learjet models and a defined tyre part/serial number range; it does not broaden regulatory scope beyond correcting the identified unsafe tyres and therefore does not change the original, narrow safety scope."},"complexity_factors":["Narrow applicability by aircraft model and tyre part/serial number range (Applicability) — reduces scope and simplifies compliance.","Mandatory action is limited to a single, short task: visual inspection and replacement before further flight (Requirement & Compliance) — low procedural complexity.","Firm compliance deadline (Compliance) creates time pressure for operators to inspect and replace tyres promptly.","References external documents (Bombardier Advisory Wire 32-021; FAA AD 2001-07-11; Goodyear SB GY SB 2001-32-001) (Notes) — requires operators to consult additional materials for implementation details.","Identification by serial number may require physical checks of tyres on aircraft or in inventory — modest operational burden.","Decision authority is narrow and fixed: CASA delegate issued the AD under subregulation 39.1(1) (front matter) — no discretionary relief provided in the text.","Population size described as approximately 300 tyres (Background) — limits scale but creates logistical replacement cost for affected operators."],"plain_english_summary":"This Airworthiness Directive requires operators of Learjet 35, 35A, 36 and 36A aircraft fitted with Goodyear main landing‑gear tyres part number 178K23‑5 (serial numbers 0148xxxx–0152xxxx) to inspect those tyres and replace any affected item before further flight. The measure responds to reported tread separation on certain Goodyear Flight Eagle tyres and forces identification and removal of a small, specified population of potentially defective tyres."}},"importantCases":[],"_links":{"self":"/api/acts/ad-learjet-35-38-main-landing-gear-tyre","history":"/api/acts/ad-learjet-35-38-main-landing-gear-tyre/history","analysis":"/api/acts/ad-learjet-35-38-main-landing-gear-tyre/analysis","conflicts":"/api/acts/ad-learjet-35-38-main-landing-gear-tyre/conflicts","importantCases":"/api/acts/ad-learjet-35-38-main-landing-gear-tyre/important-cases","documents":"/api/acts/ad-learjet-35-38-main-landing-gear-tyre/documents"}}