{"id":"F2007L04891","name":"AD/BAe 146/120 Amdt 1 - Wing Top Skin under Rib 0 Joint Strap","slug":"ad-bae-146-120-amdt-1-wing-top-skin-under-rib-0-joint-strap","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":71723,"registerId":"commonwealth-F2007L04891-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"British Aerospace BAe 146 Series Aeropla","sectionType":"division","heading":"British Aerospace BAe 146 Series Aeroplanes","content":"### British Aerospace BAe 146 Series Aeroplanes\n\n| AD/BAe 146/120 Amdt 1 | Wing Top Skin under Rib 0 Joint Strap | 2/2008 DM |\n| --------------------- | ------------------------------------- | --------- |\n\n| Applicability: | BAe 146 100 Series aircraft , S/N E1144 and subsequent;BAe 146 200 Series aircraft, S/N E2148 and subsequent;BAe 146 300 Series aircraft, S/N E3141 and subsequent;AVRO 146-RJ70 Series aircraft, S/N E1223 up to and including E1267;AVRO 146-RJ85 Series aircraft, S/N E2208 up to and including E2277, and S/N E2288; andAVRO 146-RJ100 Series aircraft, S/N E3221 up to and including E3276, and S/N E3282, E3283, E3284 and E3286.                                                                                                                                                                                                                                         |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the technical requirements of EASA Airworthiness Directive (AD) 2007-0304.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |\n| Compliance:    | As per the requirements document with an effective date of the 28 December 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |\n|                | This Amendment becomes effective on 28 December 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |\n| Background:    | At the initial issue of BAE Systems (operations) Ltd Inspection Service Bulletin (ISB) 57-a071, which was mandated by EASA AD 2006-0091-E, inspection for possible cracks were required on the wing top skin under the rib 0 joint strap. This ISB has now been revised, adding specific instructions for aircraft which have embodied a centre wing overwing refuel aperture repair. Changes consist of a revision of Appendix 1 (ultrasonic inspection) to define the extent of wing top skin inspection and the inclusion of Appendix 2 (radiographic inspection) to inspect further areas of the wing top skin at the outboard fastener row overlapped by the repair plate. |\n\n|     | The original issue of this AD became effective on 26 April 2006. |\n| --- | ---------------------------------------------------------------- |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n17 December 2007","sortOrder":0},{"sectionNumber":"AD/BAe 146/120 Amdt 1","sectionType":"part","heading":"AD/BAe 146/120 Amdt 1","content":"## AD/BAe 146/120 Amdt 1","sortOrder":1},{"sectionNumber":"Wing Top Skin under Rib 0 Joint Strap","sectionType":"part","heading":"Wing Top Skin under Rib 0 Joint Strap","content":"## Wing Top Skin under Rib 0 Joint Strap","sortOrder":2},{"sectionNumber":"2/2008 DM","sectionType":"part","heading":"2/2008 DM","content":"## 2/2008 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"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"The amendment expands the original inspection regime by revising ISB 57‑a071: it defines the ultrasonic inspection extent (Appendix 1) and adds a radiographic inspection (Appendix 2) for areas overlapped by a centre wing overwing refuel aperture repair. This broadens inspection techniques and coverage for affected aircraft compared with the original AD issued April 2006."},"complexity_factors":["Technical inspection methods required (ultrasonic and radiographic) demand specialist equipment and expertise.","Applicability tied to specific airframe serial numbers across multiple BAe/AVRO series.","Cross‑referencing to EASA AD 2007‑0304 and a revised BAE Systems Inspection Service Bulletin increases procedural interdependence.","Additional instructions apply only where a specific repair (centre wing overwing refuel aperture repair) is embodied, creating conditional requirements.","Mandatory compliance date and regulatory enforcement introduce legal/timing pressures on operators.","Potential need to subcontract to certified maintenance/inspection providers and to preserve records of compliance."],"plain_english_summary":"This amendment requires operators of specified BAe 146/AVRO 146‑RJ aircraft (listed by serial number) to carry out inspections and any corrective action in line with EASA Airworthiness Directive 2007‑0304, effective 28 December 2007. It updates a BAE Systems Inspection Service Bulletin to add clearer ultrasonic‑inspection limits and a new radiographic inspection for areas covered by a centre wing overwing refuel aperture repair. Aircraft operators pay for inspections and repairs; regulators (CASA, via the delegate) mandate compliance and may require specialist ultrasonic or radiographic services."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment remains tightly scoped to its original purpose: ensuring structural integrity of wing top skins on BAe 146/Avro RJ aircraft. The amendment simply expands the inspection requirements to cover additional aircraft configurations (those with specific repairs) without broadening the directive's fundamental scope."},"complexity_factors":["Short, single-purpose document (one specific structural inspection)","Only 6 defined aircraft applicability ranges (serial number ranges)","Single cross-reference to external technical document (EASA AD 2007-0304)","No nested conditional logic — compliance is straightforward 'follow the EASA directive'","Background provides clear rationale for the amendment","Minimal legal drafting — primarily technical specification by reference"],"plain_english_summary":"This airworthiness directive orders mandatory inspections and required repairs to the wing top skin near rib 0 on certain British Aerospace BAe 146 and Avro RJ series aircraft, and adopts technical instructions from EASA AD 2007‑0304. It also adds inspections for aircraft with the centre wing overwing refuel aperture repair. It affects listed owners/operators of BAe 146/Avro RJ types and is safety‑critical due to the risk of wing structural cracking (compliance by 28 Dec 2007)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bae-146-120-amdt-1-wing-top-skin-under-rib-0-joint-strap","history":"/api/acts/ad-bae-146-120-amdt-1-wing-top-skin-under-rib-0-joint-strap/history","analysis":"/api/acts/ad-bae-146-120-amdt-1-wing-top-skin-under-rib-0-joint-strap/analysis","conflicts":"/api/acts/ad-bae-146-120-amdt-1-wing-top-skin-under-rib-0-joint-strap/conflicts","importantCases":"/api/acts/ad-bae-146-120-amdt-1-wing-top-skin-under-rib-0-joint-strap/important-cases","documents":"/api/acts/ad-bae-146-120-amdt-1-wing-top-skin-under-rib-0-joint-strap/documents"}}