{"id":"F2008L00724","name":"AD/J4100/23 - Nose Landing Gear Wheel Outer Cone","slug":"ad-j4100-23-nose-landing-gear-wheel-outer-cone","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":72761,"registerId":"commonwealth-F2008L00724-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"BAe Systems (Operations) Jetstream 4100 ","sectionType":"division","heading":"BAe Systems (Operations) Jetstream 4100 Series Aeroplanes","content":"### BAe Systems (Operations) Jetstream 4100 Series Aeroplanes\n\n| AD/J4100/23 | Nose Landing Gear Wheel Outer Cone | 4/2008 |\n| ----------- | ---------------------------------- | ------ |\n\n| Applicability: | All Model Jetstream Series 4100 aircraft, all serial numbers.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the requirements of EASA AD 2008-0036.Note: BAE SYSTEMS (Operations) Limited Service Bulletin J41-32-086 original issue, or later EASA approved revision, refers.                                                                                                                                                                                                                                                                                                                                                                                                             |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of10 April 2008.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |\n|                | This Airworthiness Directive becomes effective on 10 April 2008.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |\n| Background:    | A failure mode has been identified following the examination of parts from a Jetstream 4100 Series aircraft, that can lead to the loss of a nose wheel. A combination of excessive wear and/or adverse tolerances on the axle inner cone, outer cone or wheel hub splined sleeve cones results in the loss of the critical gap between the inner flange face of the wheel outer cone and the axle end face. This condition, if not corrected, can cause the wheel nut lock plate to break, leading to the wheel retention nut unscrewing and subsequent separation of the nose wheel from the NLG axle. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n28 February 2008","sortOrder":0},{"sectionNumber":"AD/J4100/23","sectionType":"part","heading":"AD/J4100/23","content":"## AD/J4100/23","sortOrder":1},{"sectionNumber":"Nose Landing Gear Wheel Outer Cone","sectionType":"part","heading":"Nose Landing Gear Wheel Outer Cone","content":"## Nose Landing Gear Wheel Outer Cone","sortOrder":2},{"sectionNumber":"4/2008","sectionType":"part","heading":"4/2008","content":"## 4/2008","sortOrder":3}],"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope appears unchanged from the cited requirement documents: applicability remains all Jetstream 4100 series aircraft and the AD adopts the corrective actions in EASA AD 2008-0036/BAE SB. The only explicit change noted in the text is a revised effective date of 10 April 2008 (Compliance)."},"complexity_factors":["External cross-reference: mandatory compliance is defined by EASA AD 2008-0036 and BAE Service Bulletin J41-32-086 (Requirement).","Technical diagnosis: failure involves dimensional wear/tolerance interactions and a loss of a critical gap leading to mechanical separation (Background).","Fixed effective date with revised timing creates a clear compliance deadline (Compliance: revised effective date of 10 April 2008).","Broad applicability: applies to all Jetstream 4100 series aircraft, all serial numbers (Applicability).","Limited regulatory discretion: allows use of later EASA-approved revisions of the service bulletin but otherwise prescribes specific corrective action (Requirement note)."],"plain_english_summary":"This Airworthiness Directive orders inspections and corrective action on all BAe Jetstream 4100 series aeroplanes, to be carried out in accordance with EASA AD 2008-0036 and BAE Service Bulletin J41-32-086, to prevent loss of a nose wheel.\n\nOperators (aircraft owners/maintenance organisations) must arrange and pay for the required inspections/repairs by the stated effective date (10 April 2008). The Civil Aviation Safety Authority enforces compliance; the fault arises from wear/tolerance loss that can allow the wheel-retention nut to unscrew (Background, Requirement, Compliance)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive targeting a specific mechanical defect in a specific aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined term implicitly referenced (EASA AD 2008-0036)","Single mechanical issue addressed with clear causal chain","No nested exceptions or conditional logic — simple 'applies to all' applicability","Cross-reference to external technical document (Service Bulletin) but no internal cross-referencing structure","Straightforward compliance requirement: follow the European directive"],"plain_english_summary":"This CASA Airworthiness Directive mandates owners and operators of BAe Systems Jetstream 4100 series aircraft to inspect and remediate a wear/manufacture issue with the nose landing gear wheel outer cone that can allow the wheel nut to loosen and the nose wheel to separate. Compliance follows EASA AD 2008‑0036 and BAE Systems Service Bulletin J41‑32‑086. The directive, effective 10 April 2008, prevents potential loss of control or runway accidents."}},"importantCases":[],"_links":{"self":"/api/acts/ad-j4100-23-nose-landing-gear-wheel-outer-cone","history":"/api/acts/ad-j4100-23-nose-landing-gear-wheel-outer-cone/history","analysis":"/api/acts/ad-j4100-23-nose-landing-gear-wheel-outer-cone/analysis","conflicts":"/api/acts/ad-j4100-23-nose-landing-gear-wheel-outer-cone/conflicts","importantCases":"/api/acts/ad-j4100-23-nose-landing-gear-wheel-outer-cone/important-cases","documents":"/api/acts/ad-j4100-23-nose-landing-gear-wheel-outer-cone/documents"}}