{"id":"F2008L00511","name":"AD/J4100/22 - Main Wheel Tie Bolts","slug":"ad-j4100-22-main-wheel-tie-bolts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":119363,"registerId":"commonwealth-F2008L00511-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/J4100/22 | Main Wheel Tie Bolts | 4/2008 DM |\n| ----------- | -------------------- | --------- |\n\n| Applicability: | All Model Jetstream Series 4100 aircraft. |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. Carry out the Accomplishment Instructions detailed in paragraph 2 of BAE Systems Service Bulletin (SB) J41-32-058 Revision 1, or later EASA approved revision.a. At every 5th main wheel tyre change, discard and replace the main wheel tie bolts in accordance with paragraph 2 of SB J41-32-058 Revision 1, or later EASA approved revision.b. For main wheel tie bolts previously subject to UK CAA AD 002-05-97, the five allowable tyre changes shall continue to be counted from the initial installation of the bolts when new;OR,2. From the effective date of this Directive, inspect the main wheel tie bolts at each tyre change in accordance with the instructions detailed in paragraph 2 of SB J41-32-058 Revision 2, or later EASA approved revision. Main wheel tie bolts maintained in accordance with this requirement are not subsequently eligible for compliance with Requirement 1.Incorporation of SB J41-32-072 Revision 1, or later EASA approved revision, which introduces a modified main wheel assembly with larger diameter wheel tie bolts, constitutes terminating action for the requirements of this Directive.Note: UK CAA AD G-2005-0022 refers. |\n| Compliance: | 1. At the next main wheel tyre change after the effective date of this Directive.2. From the effective date of this Directive. |\n| | This Airworthiness Directive becomes effective on 20 February 2008. |\n\n| Background: | Following a series of failures of 5/16-inch diameter main wheel tie bolts which could have resulted in wheel and/or tyre failure, and with consequential damage or impaired directional control, SB J41-32-058 Revision 1 was mandated by CAA AD 002-05-97.Revision 2 of SB J41-32-058 covers revised Dunlop vendor Service Bulletin AHA1837-32-1157 at Revision 4 which changes the maintenance procedure for the main wheel tie bolts and, if carried out, removes the retirement life that was imposed on the bolts. |\n| ----------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png) \nDavid Villiers \nDelegate of the Civil Aviation Safety Authority\n\n15 February 2008","sortOrder":0},{"sectionNumber":"AD/J4100/22","sectionType":"part","heading":"AD/J4100/22","content":"## AD/J4100/22","sortOrder":1},{"sectionNumber":"Main Wheel Tie Bolts","sectionType":"part","heading":"Main Wheel Tie Bolts","content":"## Main Wheel Tie Bolts","sortOrder":2},{"sectionNumber":"4/2008 DM","sectionType":"part","heading":"4/2008 DM","content":"## 4/2008 DM","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"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive with a focused, narrow scope: addressing a specific mechanical failure mode (main wheel tie bolt failures) in a specific aircraft type. The alternative compliance options and terminating action are typical of aviation safety regulation and do not represent scope creep beyond the original safety purpose."},"complexity_factors":["Two alternative compliance paths (Requirement 1 OR Requirement 2) with different ongoing obligations","Cross-references to multiple external documents: BAE Systems Service Bulletin J41-32-058 (Revisions 1 and 2), UK CAA AD 002-05-97, and terminating action via SB J41-32-072","Conditional logic regarding 'previously subject to' UK CAA AD 002-05-97 affecting tyre change counting","Mutual exclusivity clause: Requirement 2 compliance renders bolts ineligible for Requirement 1","Terminating action provision that exempts future compliance if specific modification installed","Dual compliance dates depending on which requirement is chosen"],"plain_english_summary":"This CASA Airworthiness Directive targets failed 5/16‑inch main wheel tie bolts on BAe Jetstream 4100 series aircraft that can cause wheel/tyre loss and possible loss of control. Operators must either replace tie bolts every fifth tyre change or inspect them at every tyre change (inspection-only choice is permanent). Installing the modified wheel assembly with larger bolts per Service Bulletin J41‑32‑072 is a terminating action. The AD enforces routine action to prevent wheel failures and improve flight safety."},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":true,"description":"Scope shifted from a prior mandatory retirement life for the 5/16-inch tie bolts to allowing an inspection-based maintenance regime and an alternative terminating action. Revision 2 of SB J41-32-058 changes maintenance procedures so the bolts need not be retired at a fixed life if inspected per the new instructions, and SB J41-32-072 provides a capital upgrade (larger bolts) that terminates the Directive’s requirements. (Background; Requirement)"},"complexity_factors":["Dual compliance routes: mandatory replacement every 5th tyre change versus inspection at every tyre change (Requirement 1 and Requirement 2). (Requirement)","Legacy-counting rule: bolts already subject to UK CAA AD 002-05-97 continue counting tyre changes from initial installation, requiring historical traceability. (Requirement 1.b)","Multiple referenced documents and revision control: compliance depends on particular revisions of SB J41-32-058 (Revision 1 or Revision 2) and allowance for ‘later EASA approved revision’, creating dependency on external approvals. (Requirement; Compliance)","Terminating action option: incorporation of SB J41-32-072 Revision 1 (modified wheel assembly with larger bolts) removes the Directive’s requirements, adding an alternative capital-replacement path. (Requirement)","Operational frequency burden: inspections or replacements are tied to each main-wheel tyre change or every fifth tyre change, imposing recurring maintenance and recordkeeping. (Requirement; Compliance)","Effective date and immediate trigger: first compliance is required at the next main wheel tyre change after the Directive’s effective date, creating near-term operational impact. (Compliance)","Safety-history linkage: directive issued following series of 5/16-inch tie-bolt failures, and Revision 2 changes procedures to remove a previously imposed retirement life if the new maintenance is followed, affecting lifecycle management. (Background)"],"plain_english_summary":"This Airworthiness Directive affects all BAe Jetstream 4100-series aircraft. It requires operators to either discard and replace main wheel tie bolts at every fifth main-wheel tyre change or, alternatively, inspect the bolts at every tyre change under the specified BAe/Dunlop service bulletin procedures. Installing a modified main wheel assembly with larger bolts ends the Directive’s requirements. Operators and maintenance organisations must follow the EASA‑approved service bulletin revisions and bear the cost and record‑keeping of replacements or inspections."}},"importantCases":[],"_links":{"self":"/api/acts/ad-j4100-22-main-wheel-tie-bolts","history":"/api/acts/ad-j4100-22-main-wheel-tie-bolts/history","analysis":"/api/acts/ad-j4100-22-main-wheel-tie-bolts/analysis","conflicts":"/api/acts/ad-j4100-22-main-wheel-tie-bolts/conflicts","importantCases":"/api/acts/ad-j4100-22-main-wheel-tie-bolts/important-cases","documents":"/api/acts/ad-j4100-22-main-wheel-tie-bolts/documents"}}