{"id":"F2006B10564","name":"AD/HS 748/29 - Nose Landing Gear","slug":"ad-hs-748-29-nose-landing-gear","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116391,"registerId":"commonwealth-F2006B10564-current","compilationNumber":null,"startDate":"2026-04-03","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\nBritish Aerospace (Hawker Siddeley) HS 748 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/HS 748/29 Nose Landing Gear 6/2002","sectionType":"part","heading":"AD/HS 748/29 Nose Landing Gear 6/2002","content":"# AD/HS 748/29 Nose Landing Gear 6/2002\n\nApplicability: All HS748 series aircraft.\n\nRequirement: Action in accordance with BAE Systems Mandatory Service Bulletin HS748-32-104. Compliance: At the next scheduled nose landing gear removal after 13 June 2002 or before 31 July\n\n2005, whichever occurs first.\n\nThis Airworthiness Directive becomes effective on 13 June 2002.\n\nBackground: Failure to observe instructions for installing the nose landing gear can result in incorrect assembly. This may result in the pintle pin being unlocked so that it is free to migrate from its support housing, which may eventually lead to jamming or collapse of the gear. An additional baulking device is introduced to provide further confirmation that the pintle pin has been correctly installed.\n\n![](image.002.png)  \n\nSteven John Swift\n\nDelegate of the Civil Aviation Safety Authority 1 May 2002\n\n![](image.001.png)","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope: addressing a specific mechanical defect in a specific aircraft type's nose landing gear. The scope has not expanded beyond the original safety-critical purpose of preventing landing gear failure."},"complexity_factors":["Single, clearly defined applicability (all HS748 series aircraft)","Only one substantive requirement referencing an external technical document (BAE Systems Service Bulletin)","Simple compliance deadline structure (next scheduled removal OR fixed date, whichever first)","Minimal defined terms (only standard aviation terminology like 'pintle pin' and 'baulking device' explained in background)","No nested exceptions or conditional logic","Short document (approximately 250 words excluding images)","Single regulatory instrument type (Airworthiness Directive under CAR 1998 subregulation 39.1(1))"],"plain_english_summary":"This CASA safety order requires operators of British Aerospace HS 748 aircraft in Australia to inspect and modify the nose landing gear per the manufacturer's technical bulletin (HS748-32-104) to fit an added baulking device. It addresses a risk that the pintle pin can work loose and allow the nose gear to jam or collapse. Compliance deadline: 31 July 2005 (or sooner if gear is removed for maintenance)."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD applies to all HS748 series aircraft and prescribes the corrective action in the referenced BAE service bulletin to prevent pintle‑pin migration. The text confines requirements to that corrective measure and a specific compliance window, and does not expand scope beyond the stated unsafe condition or the required remedial steps."},"complexity_factors":["Narrow applicability: applies only to HS748 series aircraft (low actor count).","References external mandatory service bulletin (HS748‑32‑104); full technical requirements sit in that document.","Safety‑critical technical installation (pintle pin and baulking device) requires qualified maintenance actions.","Fixed compliance window tied to next nose‑gear removal after 13 June 2002 or by 31 July 2005, creating scheduling constraints for operators.","Regulatory enforcement by CASA with potential recordkeeping and inspection obligations.","Low legal drafting complexity but moderate operational complexity due to maintenance planning and parts/skill availability."],"plain_english_summary":"This Airworthiness Directive requires operators of all British Aerospace HS 748 aircraft to carry out the modification and inspection steps in BAE Systems Mandatory Service Bulletin HS748‑32‑104 when the nose landing gear is next removed after 13 June 2002, and by 31 July 2005 at the latest. It adds a baulking device to prevent the nose‑gear pintle pin migrating and causing jamming or collapse. Aircraft operators pay for and schedule the work; CASA enforces timing and conformity to the service bulletin."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-748-29-nose-landing-gear","history":"/api/acts/ad-hs-748-29-nose-landing-gear/history","analysis":"/api/acts/ad-hs-748-29-nose-landing-gear/analysis","conflicts":"/api/acts/ad-hs-748-29-nose-landing-gear/conflicts","importantCases":"/api/acts/ad-hs-748-29-nose-landing-gear/important-cases","documents":"/api/acts/ad-hs-748-29-nose-landing-gear/documents"}}