{"id":"F2005L01340","name":"AD/AMD 50/33 - Central Engine Mast Rivets","slug":"ad-amd-50-33-central-engine-mast-rivets","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":35117,"registerId":"commonwealth-F2005L01340-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AMD Falcon 50 and 900 Series Aeroplanes","sectionType":"division","heading":"AMD Falcon 50 and 900 Series Aeroplanes","content":"### AMD Falcon 50 and 900 Series Aeroplanes\n\n| AD/AMD 50/33 | Central Engine Mast Rivets | 7/2005 |\n| ------------ | -------------------------- | ------ |\n\n| Applicability: | Model Falcon 900 EX aircraft, serial numbers 1 through 137; except aircraft with Dassault Aviation Service Bulletin F900 EX -220 incorporated.       |\n| -------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with Dassault Aviation Service Bulletin F900 EX -220.Note: DGAC AD F-2005-066 refers.                                           |\n| Compliance:    | Before the accumulation of 7,500 total flight hours.                                                                                                 |\n|                | This Airworthiness Directive becomes effective on 7 July 2005.                                                                                       |\n| Background:    | The DGAC received a report of two missing rivets in the front section of the central engine mast. This discrepancy was discovered during production. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n25 May 2005","sortOrder":0},{"sectionNumber":"AD/AMD 50/33","sectionType":"part","heading":"AD/AMD 50/33","content":"## AD/AMD 50/33","sortOrder":1},{"sectionNumber":"Central Engine Mast Rivets","sectionType":"part","heading":"Central Engine Mast Rivets","content":"## Central Engine Mast Rivets","sortOrder":2},{"sectionNumber":"7/2005","sectionType":"part","heading":"7/2005","content":"## 7/2005","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive addressing a specific technical defect in specific aircraft. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 1 defined applicability criterion (serial number range plus single exception)","Single compliance requirement referencing an external technical document","No nested conditions, cross-references to other legislation, or interpretive provisions","Straightforward temporal compliance trigger (flight hours accumulation)","Minimal legal machinery — essentially a direct incorporation of manufacturer technical instructions"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's aviation regulator (CASA) for specific aircraft.\n\n**What it does:**\nOrders owners and operators of certain **Dassault Falcon 900 EX business jets** (serial numbers 1 through 137) to inspect and fix a specific problem: missing rivets in the front section of the central engine mast. The fix must follow the manufacturer's official instructions (Service Bulletin F900 EX-220).\n\n**Who it affects:**\n- Owners and operators of Falcon 900 EX aircraft with serial numbers 1–137\n- **Exception:** Aircraft that have already had the manufacturer's Service Bulletin F900 EX-220 applied don't need to do this again\n\n**Why it matters:**\nMissing rivets in an engine mount structure could compromise the structural integrity of the aircraft. This is a proactive safety measure to prevent potential mechanical failure before it happens.\n\n**Key deadlines:**\n- Must be completed before the aircraft reaches **7,500 total flight hours**\n- Took effect on **7 July 2005**\n\n**Background:**\nThe French aviation authority (DGAC) discovered this issue during aircraft production and reported it, triggering this Australian safety directive."},"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive imposes a targeted, one‑time corrective action on a defined set of aircraft (s/n 1–137) and excludes aircraft that have already incorporated the Dassault service bulletin. It does not expand affected types or create ongoing recurring obligations beyond the one‑time compliance before 7,500 flight hours."},"complexity_factors":["Narrow, discrete applicability: applies only to Falcon 900 EX serial numbers 1–137, with an explicit exception for aircraft that have already incorporated the referenced service bulletin (Applicability).","Dependency on external technical document: the AD mandates action “in accordance with Dassault Aviation Service Bulletin F900 EX -220,” so operators must obtain and follow that bulletin for procedural detail (Requirement).","Fixed compliance deadline tied to usage: work must be done before accumulation of 7,500 total flight hours, creating a monitoring and scheduling requirement for operators (Compliance).","Limited procedural detail in the AD itself: the AD defers to the service bulletin for how to perform the work, which concentrates technical discretion with the manufacturer and maintenance providers (Requirement / Background).","Immediate safety trigger from production report: the AD responds to a report of two missing rivets found during production, indicating a targeted corrective action rather than a recurring mandatory programme (Background).","Cross‑jurisdictional reference: the AD notes a related DGAC AD (F‑2005‑066), which may require operators to reconcile multiple regulatory or international maintenance references (Requirement / Note)."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Dassault Falcon 900 EX aircraft, serial numbers 1–137 (unless Dassault Service Bulletin F900 EX‑220 is already incorporated), to carry out the work described in Service Bulletin F900 EX‑220 to address missing rivets in the front section of the central engine mast. The specified corrective action must be completed before the aeroplane accumulates 7,500 total flight hours, imposing a one‑time maintenance, cost and scheduling obligation on affected operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-amd-50-33-central-engine-mast-rivets","history":"/api/acts/ad-amd-50-33-central-engine-mast-rivets/history","analysis":"/api/acts/ad-amd-50-33-central-engine-mast-rivets/analysis","conflicts":"/api/acts/ad-amd-50-33-central-engine-mast-rivets/conflicts","importantCases":"/api/acts/ad-amd-50-33-central-engine-mast-rivets/important-cases","documents":"/api/acts/ad-amd-50-33-central-engine-mast-rivets/documents"}}