{"id":"F2007L04215","name":"AD/BEECH 400/28 - Engine Cowling Panel Fasteners","slug":"ad-beech-400-28-engine-cowling-panel-fasteners","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":70411,"registerId":"commonwealth-F2007L04215-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Beechcraft 400 Series Aeroplanes","sectionType":"division","heading":"Beechcraft 400 Series Aeroplanes","content":"### Beechcraft 400 Series Aeroplanes\n\n| AD/BEECH 400/28 | Engine Cowling Panel Fasteners | 12/2007 |\n| --------------- | ------------------------------ | ------- |\n\n| Applicability: | Model 400, 400A, and 400T series aircraft, as identified in Raytheon Service Bulletin SB 54-3788 dated December 2006, or later FAA approved revision.                                                                                                                                                                            |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Modify the attachment fasteners on the engine cowling panels in accordance with the Accomplishment Instructions of Raytheon Service Bulletin SB 54-3788 original issue, or later FAA approved revision.Note: FAA AD 2007-19-05 Amdt 39-15195 refers.                                                                             |\n| Compliance:    | Within 200 flight hours after 22 November 2007.                                                                                                                                                                                                                                                                                  |\n|                | This Airworthiness Directive becomes effective on 22 November 2007.                                                                                                                                                                                                                                                              |\n| Background:    | The FAA received several reports of loose attachment fasteners on the engine cowling panels, with the panels either peeling back or separating from the aircraft during flight. Separation of a panel during flight could result in damage to aircraft structure, or cause injury to people or damage to property on the ground. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n9 October 2007","sortOrder":0},{"sectionNumber":"AD/BEECH 400/28","sectionType":"part","heading":"AD/BEECH 400/28","content":"## AD/BEECH 400/28","sortOrder":1},{"sectionNumber":"Engine Cowling Panel Fasteners","sectionType":"part","heading":"Engine Cowling Panel Fasteners","content":"## Engine Cowling Panel Fasteners","sortOrder":2},{"sectionNumber":"12/2007","sectionType":"part","heading":"12/2007","content":"## 12/2007","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":2,"scope_assessment":{"changed":false,"description":"N/A - This is a discrete safety directive addressing a specific mechanical defect. It has not expanded beyond its original purpose of mandating a specific repair to engine cowling fasteners on a defined aircraft series."},"complexity_factors":["Very short document (under 300 words)","Only 3 defined applicability criteria (specific aircraft models)","Single, unambiguous compliance requirement referencing an external technical standard (Service Bulletin)","Simple time-based compliance trigger (200 flight hours from effective date)","No nested exceptions, conditional logic, or cross-references to other legislation","Clear causal chain: problem → risk → required action → deadline"],"plain_english_summary":"This CASA Airworthiness Directive mandatorily requires operators of Beechcraft Model 400/400A/400T (per Raytheon SB 54-3788) to modify engine cowling attachment fasteners because bolts have come loose and panels have peeled off or fallen during flight.  \n\nThe modification must be done per the service bulletin (or FAA‑approved revision) within 200 flight hours of 22 November 2007 — a safety‑critical action; non‑compliance grounds the aircraft."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Scope remains limited to the Beechcraft 400 series aircraft identified in Raytheon Service Bulletin SB 54-3788 and to the specified modification of cowling panel fasteners. The AD adopts the FAA-referenced corrective action and a 200‑flight‑hour compliance window; there is no text in this instrument that expands or narrows the applicability beyond that source."},"complexity_factors":["Clear, single technical requirement (Requirement: modify attachment fasteners per Raytheon SB 54-3788).","Applicability limited to specific models identified by an external document (Applicability: Model 400, 400A, 400T as in SB 54-3788).","Reliance on an external, externally maintained document and its future revisions ('or later FAA approved revision') introduces interpretive and update-dependency risk (Requirement).","Fixed compliance window creates scheduling pressure for operators (Compliance: within 200 flight hours after 22 November 2007).","Action requires maintenance resources, parts and technician labour — a direct compliance cost borne by owners/operators (Requirement/Applicability).","Safety rationale is operational (Background: reports of loose fasteners and panel separation), so regulators expect physical inspection and modification work rather than purely administrative steps."],"plain_english_summary":"**What this AD does:** Requires owners/operators of Beechcraft Model 400, 400A and 400T aircraft (as identified in Raytheon Service Bulletin SB 54-3788) to modify the engine cowling panel attachment fasteners in accordance with that service bulletin (or a later FAA‑approved revision). The modification must be completed within 200 flight hours after 22 November 2007. The stated purpose is to prevent cowling panels from peeling back or separating in flight, which could damage the aircraft or injure people or property."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-400-28-engine-cowling-panel-fasteners","history":"/api/acts/ad-beech-400-28-engine-cowling-panel-fasteners/history","analysis":"/api/acts/ad-beech-400-28-engine-cowling-panel-fasteners/analysis","conflicts":"/api/acts/ad-beech-400-28-engine-cowling-panel-fasteners/conflicts","importantCases":"/api/acts/ad-beech-400-28-engine-cowling-panel-fasteners/important-cases","documents":"/api/acts/ad-beech-400-28-engine-cowling-panel-fasteners/documents"}}