{"id":"F2008L00506","name":"AD/J4100/17 - Nose Fuselage Structure between Station 4 and Station 11","slug":"ad-j4100-17-nose-fuselage-structure-between-station-4-and-station-11","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":119348,"registerId":"commonwealth-F2008L00506-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/J4100/17 | Nose Fuselage Structure between Station 4 and Station 11 | 4/2008 DM |\n| ----------- | -------------------------------------------------------- | --------- |\n\n| Applicability: | All Model Jetstream Series 4100 aircraft.                                                                                                                                                                                                                                                                      |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with BAE Systems Mandatory Service Bulletin J41-53-047 Revision 1, or later CAA/EASA approved revision.Note: UK CAA AD 001-06-2001 refers.                                                                                                                                                |\n| Compliance:    | Unless the initial inspection is already accomplished, within 30 days after20 February 2008. Inspect thereafter at intervals not to exceed 6,000 landings.                                                                                                                                                     |\n|                | This Airworthiness Directive becomes effective on 20 February 2008.                                                                                                                                                                                                                                            |\n| Background:    | The inspection required by Mandatory Service Bulletin J41-A53-023 was carried out on an in-service aircraft. As a result, damage was discovered in diaphragms 14153005-177 and -178. When these diaphragms were removed to allow replacement, further damage to the surrounding structure was also discovered. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n15 February 2008","sortOrder":0},{"sectionNumber":"AD/J4100/17","sectionType":"part","heading":"AD/J4100/17","content":"## AD/J4100/17","sortOrder":1},{"sectionNumber":"Nose Fuselage Structure between Station ","sectionType":"part","heading":"Nose Fuselage Structure between Station 4 and Station 11","content":"## Nose Fuselage Structure between Station 4 and Station 11","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":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard, targeted Airworthiness Directive. It addresses a specific structural safety issue discovered during in-service operations and mandates fleet-wide inspection. The scope remains tightly focused on the identified nose fuselage structural defect and does not expand beyond this safety-critical maintenance requirement."},"complexity_factors":["Short, single-purpose directive with one primary requirement","Only 1 defined technical reference (the Mandatory Service Bulletin)","Simple compliance structure: initial inspection + recurring interval","No nested exceptions or conditional logic — applies to all aircraft in the series","Cross-references only 2 external documents (the Service Bulletin and a UK CAA AD)","Background explanation is brief and factual"],"plain_english_summary":"This AD mandates inspection of the nose fuselage (between Stations 4 and 11) on BAe Systems Jetstream 4100 aircraft, using BAE Mandatory Service Bulletin J41-53-047 Rev 1 (or later). It applies to all Australian Jetstream 4100 owners, operators and maintenance organisations.\n\nInspections were required within 30 days of 20 Feb 2008 (if not already done) and must repeat every 6,000 landings after, prompted by discovered and hidden structural damage that could threaten flight safety."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument implements inspections and required corrective actions in response to in-service diaphragm damage, as described in the Background, and directs action per the BAE service bulletin (Requirement). The AD does not expand or narrow applicability beyond the stated fleet (Applicability) but sets timing and document-dependant compliance mechanics (Compliance; Requirement)."},"complexity_factors":["Technical nature: requires structural inspection and possible repair of fuselage diaphragms (Background; Requirement).","Dependence on external document: compliance defined by BAE Mandatory Service Bulletin J41-53-047 and any later CAA/EASA‑approved revision (Requirement).","Fixed timing rules: initial deadline tied to a calendar date and repeat interval tied to flight cycles (Compliance).","Applicability breadth: applies to all Jetstream Series 4100 aircraft, so affects all operators of that type (Applicability).","Uncertain repair scope: discovered additional surrounding-structure damage may extend work beyond simple diaphragm replacement (Background).","Cross-reference to other authority documents: notes UK CAA AD 001-06-2001, introducing multi-jurisdictional reference points (Requirement).","Administrative enforcement: effective date and mandated intervals create compliance monitoring obligations for regulators and operators (Compliance)."],"plain_english_summary":"This Airworthiness Directive requires operators of all BAe Jetstream 4100 series aeroplanes to inspect the nose fuselage between station 4 and station 11 and carry out repairs following BAE Mandatory Service Bulletin J41‑53‑047 (or a later CAA/EASA‑approved revision). The first inspection must be done within 30 days after 20 February 2008 unless already completed, and repeated at intervals not exceeding 6,000 landings; it became effective 20 February 2008. It was issued after diaphragm damage was found in service and places inspection and repair costs and duties on operators (Requirement; Compliance; Background)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-j4100-17-nose-fuselage-structure-between-station-4-and-station-11","history":"/api/acts/ad-j4100-17-nose-fuselage-structure-between-station-4-and-station-11/history","analysis":"/api/acts/ad-j4100-17-nose-fuselage-structure-between-station-4-and-station-11/analysis","conflicts":"/api/acts/ad-j4100-17-nose-fuselage-structure-between-station-4-and-station-11/conflicts","importantCases":"/api/acts/ad-j4100-17-nose-fuselage-structure-between-station-4-and-station-11/important-cases","documents":"/api/acts/ad-j4100-17-nose-fuselage-structure-between-station-4-and-station-11/documents"}}