{"id":"F2008L00505","name":"AD/J4100/16 - Nose Landing Gear Casing","slug":"ad-j4100-16-nose-landing-gear-casing","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":119345,"registerId":"commonwealth-F2008L00505-current","compilationNumber":null,"startDate":"2026-04-03","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/J4100/16 | Nose Landing Gear Casing | 4/2008 DM |\n| ----------- | ------------------------ | --------- |\n\n| Applicability: | All Model Jetstream Series 4100 aircraft; and all nose landing gears held as spares.                                                                                                        |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with BAE Systems Mandatory Service Bulletin J41-A32-079 Revision 2, or later CAA/EASA approved revision.Note: UK CAA AD 004-10-2001 refers.                            |\n| Compliance:    | Unless the initial inspection is already accomplished, within 30 days after20 February 2008. Inspect thereafter at intervals not to exceed 1,200 landings.                                  |\n|                | This Airworthiness Directive becomes effective on 20 February 2008.                                                                                                                         |\n| Background:    | Cracks have been found in a number of nose landing gear casings. If left unchecked, these cracks could grow to such an extent that structural failure of the nose landing gear could occur. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n15 February 2008","sortOrder":0},{"sectionNumber":"AD/J4100/16","sectionType":"part","heading":"AD/J4100/16","content":"## AD/J4100/16","sortOrder":1},{"sectionNumber":"Nose Landing Gear Casing","sectionType":"part","heading":"Nose Landing Gear Casing","content":"## Nose Landing Gear Casing","sortOrder":2},{"sectionNumber":"4/2008 DM","sectionType":"part","heading":"4/2008 DM","content":"## 4/2008 DM","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, targeted airworthiness directive addressing a specific safety defect in a specific aircraft component. The scope remains precisely limited to nose landing gear casing inspections for the Jetstream 4100 series, consistent with the original purpose of preventing structural failure."},"complexity_factors":["Very short document (approximately 200 words)","Only 2 defined applicability categories (aircraft and spare parts)","Single compliance pathway with clear deadline and interval","No nested exceptions or conditional logic","Cross-references only one external technical document (Service Bulletin) and one related UK directive","Straightforward imperative language ('Action in accordance with...')"],"plain_english_summary":"Owners and operators of BAe Systems Jetstream 4100-series aircraft (and holders of spare nose landing gear) must inspect the nose landing gear casing for cracks, following BAE Systems Mandatory Service Bulletin J41-A32-079 Rev 2 (or later). An initial inspection was required within 30 days of 20 February 2008, with repeat checks every 1,200 landings. The AD aims to prevent casing cracks from progressing to nose gear failure during landing or taxiing."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"Based on the text provided, the directive applies to all Jetstream 4100 series aeroplanes and nose landing gear spares and sets inspection intervals and a mandatory service‑bulletin procedure. The instrument contains no language indicating a change from an earlier stated scope or an amendment of prior applicability; the scope appears consistent with the stated safety purpose ('Applicability', 'Requirement', 'Compliance', 'Background' lines)."},"complexity_factors":["Applicability scope covers all Jetstream Series 4100 aircraft and spare nose landing gears — ('Applicability' line). This widens who must comply and who bears costs.","Mandates action 'in accordance with BAE Systems Mandatory Service Bulletin J41‑A32‑079 Revision 2, or later CAA/EASA approved revision' — ('Requirement' line). Reliance on an external service bulletin and later regulator-approved revisions creates implementation dependency and approval tracking.","Compliance timing: initial inspection within 30 days after 20 February 2008 (unless already done), then repeating at intervals not to exceed 1,200 landings — ('Compliance' lines). Requires operators to track landing counts and schedule inspections, imposing operational and record‑keeping burdens.","Effective date explicitly specified as 20 February 2008 — ('This Airworthiness Directive becomes effective on 20 February 2008'). Sets a short compliance window for initial inspections.","No alternative methods of compliance or exemption procedures are set out in the text provided; compliance is defined by reference to the service bulletin and regulator approvals — (implicit in 'Requirement' and absence of alternative wording).","Safety rationale is narrowly technical: detection of cracks that could cause nose gear structural failure — ('Background' line). The directive targets a discrete mechanical risk rather than broad operational rules."],"plain_english_summary":"This directive requires operators and maintainers of all BAe Jetstream 4100 series aircraft (and nose landing gear held as spares) to inspect the nose landing gear casing and carry out any required work following BAE Systems Mandatory Service Bulletin J41‑A32‑079 Rev 2 (or a later CAA/EASA‑approved revision). The first inspection must be done within 30 days after 20 February 2008 (unless already done) and then every 1,200 landings, because cracks have been found that could lead to structural failure."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-j4100-16-nose-landing-gear-casing","history":"/api/acts/ad-j4100-16-nose-landing-gear-casing/history","analysis":"/api/acts/ad-j4100-16-nose-landing-gear-casing/analysis","conflicts":"/api/acts/ad-j4100-16-nose-landing-gear-casing/conflicts","importantCases":"/api/acts/ad-j4100-16-nose-landing-gear-casing/important-cases","documents":"/api/acts/ad-j4100-16-nose-landing-gear-casing/documents"}}