{"id":"F2006B02390","name":"AD/AMD 50/23 - Electronic Flight Instrument System Displays","slug":"ad-amd-50-23-electronic-flight-instrument-system-displays","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41620,"registerId":"commonwealth-F2006B02390-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# ![](image.001.png)  \nAIRWORTHINESS DIRECTIVE\n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)\n\nAMD Falcon 50 and 900 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/AMD 50/23 Electronic Flight Instrumen","sectionType":"part","heading":"AD/AMD 50/23 Electronic Flight Instrument System Displays 12/2001","content":"# AD/AMD 50/23 Electronic Flight Instrument System Displays 12/2001\n\nDM\n\nApplicability: Mystère Falcon 900 aeroplanes, serial numbers 1 to 178 inclusive, except 169, equipped with an SPZ 8000 avionics system.\n\nRequirement: 1. Identify the part numbers and modification status of the Electronic Flight Instrument System (EFIS) Symbol Generators.\n\n    2. If, as a result of Requirement 1, the following symbol generators are identified:\n\n| Symbol Generator | Part Number                               | Modification Status |\n| ---------------- | ----------------------------------------- | ------------------- |\n| SG-820           | 7007356-901 or -902 or7007356-903 or -904 | without Mod S       |\n| MG-820           | 7009289-801 or -802 or7009289-803 or -804 | without Mod V       |\n\n    Insert Temporary Change No 86 in the Aircraft Flight Manual.\n\n    b. Modify the Symbol Generators in accordance with Dassault Aviation Service Bulletin F900-281 dated 21 March 2001.\n\nNote: DGAC AD 2001-466-033(B) refers.\n\nCompliance: For Requirement 1 \\- Before 14 November 2001.\n\nFor Requirement 2.a. - Immediately any of the EFIS Symbol Generators listed in Requirement 2 are identified.\n\nFor Requirement 2.b. - Within 18 months after the effective date of this Directive. This Airworthiness Directive becomes effective on 17 October 2001.\n\nBackground: The Direction Générale de L’Aviation Civile of France has advised that during certain phases of flight the quantity of data to be processed by the EFIS Symbol Generators may lead to the saturation of the processor’s computing capability. This saturation may result in the EFIS display ether flashing or going off altogether.","sortOrder":1}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The AD implements corrective action for the unsafe condition described in the Background (EFIS processor saturation) for the same subset of Falcon 900 aeroplanes referenced in the DGAC AD. It confines requirements to aircraft with SPZ 8000 avionics (Applicability), mandates identification, a temporary AFM change, and modification per Dassault Service Bulletin F900‑281 with specified compliance times. No expansion beyond that stated applicability or remedy is introduced in the instrument."},"complexity_factors":["Narrow applicability by serial number and avionics fit (Applicability) — requires careful operator identification of affected aircraft.","Technical nature of the remedy: hardware/firmware modification of EFIS symbol generators per an external Dassault Service Bulletin (Requirement 2.b; Note).","Initial identification step requires verifying part numbers and modification status of specific components (Requirement 1) — potential record-search and inspection burden.","Two-step compliance with different timings: immediate AFM temporary change when affected units are identified, and a longer 18‑month window for modification (Requirement 2.a/b; Compliance).","Dependence on external documents and foreign AD for detailed instructions (Dassault SB F900‑281; DGAC AD reference in Note) — operators must obtain and follow those materials.","Operational risk driving the directive: EFIS processor saturation that can cause displays to flash or blank, creating potential in‑flight implications (Background).","Work likely requires approved maintenance organisations and parts availability, creating direct costs and scheduling impacts for operators."],"plain_english_summary":"Requires operators of Mystère Falcon 900 aeroplanes (serial numbers 1–178, except 169) equipped with SPZ 8000 avionics to check EFIS symbol‑generator part numbers, insert a temporary Aircraft Flight Manual change if certain older generators are fitted, and modify those units per Dassault Service Bulletin F900‑281. CASA says the change corrects EFIS processor saturation that can make displays flash or go blank; owners/operators bear inspection and modification costs and must meet the AD’s deadlines."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive addressing a specific unsafe condition in specific aircraft. It has not expanded beyond its original safety purpose."},"complexity_factors":["Short, single-purpose directive with clear applicability criteria","Only 2 main requirements with straightforward conditional logic (if X found, do Y)","Minimal cross-referencing (one reference to French aviation authority AD and one Dassault service bulletin)","Specific part numbers and modification statuses listed in a simple table format","No nested definitions or interpretation sections","Compliance dates are absolute or relative to simple trigger events"],"plain_english_summary":"This Airworthiness Directive affects Mystère Dassault Falcon 900 jets (S/N 1–178, except 169) equipped with the SPZ 8000 avionics. It warns that the EFIS displays can flash or go blank from data overload, creating a serious flight-safety hazard. Operators must identify affected symbol generators, insert an interim AFM warning, and follow Dassault’s repair/modification instructions within the compliance period to restore reliable display operation."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-amd-50-23-electronic-flight-instrument-system-displays","history":"/api/acts/ad-amd-50-23-electronic-flight-instrument-system-displays/history","analysis":"/api/acts/ad-amd-50-23-electronic-flight-instrument-system-displays/analysis","conflicts":"/api/acts/ad-amd-50-23-electronic-flight-instrument-system-displays/conflicts","importantCases":"/api/acts/ad-amd-50-23-electronic-flight-instrument-system-displays/important-cases","documents":"/api/acts/ad-amd-50-23-electronic-flight-instrument-system-displays/documents"}}