{"id":"F2008L00497","name":"AD/J4100/8 - MLG Drag Brace Upper Link","slug":"ad-j4100-8-mlg-drag-brace-upper-link","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":119320,"registerId":"commonwealth-F2008L00497-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/J4100/8 | MLG Drag Brace Upper Link | 4/2008 DM |\n| ---------- | ------------------------- | --------- |\n\n| Applicability: | Model Jetstream Series 4100 aircraft, constructors numbers 41004 through 41009, and 41017, with Drag Brace part number AIR84352-0 through AIR84352-4 (with offset lightening holes) installed. |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with BAe Regional Aircraft Mandatory Service BulletinJ41-32-049 Revision 1, or later CAA/EASA approved revision.Note: UK CAA AD 008-11-95 refers.                         |\n| Compliance:    | Accomplish the Part 1 visual inspection at intervals not to exceed 50 flight hours; until accomplishment of Part 2 of the Requirement document.                                                |\n|                | This Airworthiness Directive becomes effective on 20 February 2008.                                                                                                                            |\n| Background:    | Cracking was detected in the main landing gear drag brace upper link adjacent to the offset lightening hole.                                                                                   |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n15 February 2008","sortOrder":0},{"sectionNumber":"AD/J4100/8","sectionType":"part","heading":"AD/J4100/8","content":"## AD/J4100/8","sortOrder":1},{"sectionNumber":"MLG Drag Brace Upper Link","sectionType":"part","heading":"MLG Drag Brace Upper Link","content":"## MLG Drag Brace Upper Link","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, narrow Airworthiness Directive targeting a specific safety defect in specific aircraft. It has not expanded beyond its original purpose of addressing the cracked drag brace issue."},"complexity_factors":["Single, specific mechanical defect addressed","Limited applicability (only 7 specific aircraft serial numbers plus specific part numbers)","Clear compliance requirement (visual inspection every 50 flight hours)","Single cross-reference to manufacturer service bulletin and UK CAA AD","No nested exceptions or conditional logic","Short document (approximately 200 words of substantive content)"],"plain_english_summary":"This AD requires operators of specific BAe Jetstream 4100 aircraft (S/N 41004–41009, 41017) fitted with drag brace P/Ns AIR84352-0 to -4 with offset lightening holes to inspect the main landing gear drag brace upper link every 50 flight hours until a permanent repair is done.  \n\nCracks were found near the lightening holes that could cause landing gear failure; the AD follows British Aerospace SB J41-32-049 and became effective 20 February 2008."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive targets a specific hardware fault on a limited set of Jetstream 4100 airframes fitted with certain drag-brace part numbers and prescribes interim inspections pending corrective action. Nothing in the text expands or broadens the population or obligations beyond that narrowly described scope (Applicability; Background; Requirement)."},"complexity_factors":["Very narrow applicability (specific Jetstream 4100 constructor numbers and part-number range) (Applicability)","Prescriptive short inspection interval (≤50 flight hours) until a specified follow-up action is completed (Compliance)","Mandates compliance by reference to an external manufacturer Service Bulletin, and allows only CAA/EASA-approved later revisions (Requirement) — introduces regulatory dependency","Action divided into Part 1 (inspection) and Part 2 (unspecified corrective action) which defers full resolution and creates interim compliance obligations (Requirement)","Cross-reference to another regulator’s AD (UK CAA) adds an external compliance touchpoint (Requirement/Note)","Clear effective date but limited textual detail on Part 2 corrective measures increases operational interpretation needs (Compliance; Requirement)"],"plain_english_summary":"Mandates recurring visual inspections of the main landing-gear drag-brace upper link on specified Jetstream 4100 airframes fitted with drag-brace parts AIR84352-0 to AIR84352-4, and requires follow-up corrective action per the BAe Mandatory Service Bulletin or a later CAA/EASA-approved revision (Applicability; Requirement). Operators must carry out the Part 1 inspection at intervals not exceeding 50 flight hours until Part 2 is done, bearing the inspection and compliance costs; the directive responds to detected cracking near an offset lightening hole (Compliance; Background)."},"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-j4100-8-mlg-drag-brace-upper-link","history":"/api/acts/ad-j4100-8-mlg-drag-brace-upper-link/history","analysis":"/api/acts/ad-j4100-8-mlg-drag-brace-upper-link/analysis","conflicts":"/api/acts/ad-j4100-8-mlg-drag-brace-upper-link/conflicts","importantCases":"/api/acts/ad-j4100-8-mlg-drag-brace-upper-link/important-cases","documents":"/api/acts/ad-j4100-8-mlg-drag-brace-upper-link/documents"}}