{"id":"F2010L00115","name":"AD/CESSNA 680/2 - Honeywell Primus Epic Systems","slug":"ad-cessna-680-2-honeywell-primus-epic-systems","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":122839,"registerId":"commonwealth-F2010L00115-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Cessna 680 (Citation Sovereign) Series A","sectionType":"division","heading":"Cessna 680 (Citation Sovereign) Series Aeroplanes","content":"### Cessna 680 (Citation Sovereign) Series Aeroplanes\n\n| AD/CESSNA 680/2 | Honeywell Primus Epic Systems | 1/2010 |\n| --------------- | ----------------------------- | ------ |\n\n| Applicability: | Cessna model 680 aeroplanes with serial numbers -0001 to -0021 inclusive.                                                                                                                                                                                                                                                                                                                                                                                                                                                       |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2005-08-03 Amendment 39-14055.Note: Cessna Service Bulletin SB680-34-03 Revision 1 also refers.                                                                                                                                                                                                                                                                                                                                                                  |\n| Compliance:    | Unless previously accomplished, as specified in the Requirement document.                                                                                                                                                                                                                                                                                                                                                                                                                                                       |\n|                | This Airworthiness Directive becomes effective on 28 January 2010.                                                                                                                                                                                                                                                                                                                                                                                                                                                              |\n| Background:    | A report indicated that analysis of the Honeywell Primus Epic systems installed on Cessna 680 aeroplanes revealed that all four of the cockpit display units could go blank simultaneously. This AD is issued to prevent simultaneous loss of data from all cockpit display units, and loss of primary navigation instruments, autopilot, flight director, master caution/warning lights, aural warnings, global positioning systems (GPS) position information, and air data and attitude information to non-avionics systems. |\n\n![](image.001.png)\n\nMike Higgins  \nDelegate of the Civil Aviation Safety Authority\n\n13 January 2010","sortOrder":0},{"sectionNumber":"AD/CESSNA 680/2","sectionType":"part","heading":"AD/CESSNA 680/2","content":"## AD/CESSNA 680/2","sortOrder":1},{"sectionNumber":"Honeywell Primus Epic Systems","sectionType":"part","heading":"Honeywell Primus Epic Systems","content":"## Honeywell Primus Epic Systems","sortOrder":2},{"sectionNumber":"1/2010","sectionType":"part","heading":"1/2010","content":"## 1/2010","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":false,"description":"The directive implements the FAA corrective actions for the Honeywell Primus Epic systems on the specified serial-numbered Cessna 680 aeroplanes. It does not broaden applicability beyond serial numbers -0001 to -0021 or add obligations beyond complying with the referenced FAA AD and Cessna service bulletin; no expansion of scope is indicated in the instrument."},"complexity_factors":["Cross-reference to external instrument: requires implementing FAA AD 2005-08-03 and consults Cessna SB680-34-03 Rev 1 (Requirement).","Technical/safety-critical nature: fixes involve Honeywell Primus Epic cockpit display systems, implying specialised avionics work and certified personnel (Background + Requirement).","Narrow applicability: applies only to Cessna 680 serial numbers -0001 to -0021, requiring operators to identify affected airframes (Applicability).","Compliance logistics: an effective date (28 January 2010) imposes scheduling, potential aircraft downtime and maintenance planning (Compliance).","Regulatory alignment: enforces a foreign authority AD through domestic directive, creating dependency on FAA-specified procedures and parts sourcing (Requirement).","Unquantified economic impact: costs and time for modification are borne by owners/operators but are not specified in the directive (Requirement/Background)."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Cessna 680 (Citation Sovereign) aeroplanes serial numbers -0001 to -0021 to carry out the corrective actions specified in FAA AD 2005-08-03 (and see Cessna Service Bulletin SB680-34-03 Rev 1). It is intended to prevent simultaneous loss of all four Honeywell Primus Epic cockpit displays and the resulting loss of primary navigation, flight instruments and related system outputs. Operators pay for and arrange the work; compliance can require certified avionics maintenance and temporary aircraft downtime."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive targeting a specific safety defect in specific aircraft. It has not expanded beyond its original purpose of addressing the Honeywell Primus Epic display failure risk."},"complexity_factors":["Very short document (approximately 250 words)","Only 1 defined applicability criterion (serial number range)","No nested conditional logic — single compliance pathway","No internal cross-references to other legislation","Requirements are incorporated by reference to external technical documents (FAA AD and Cessna Service Bulletin), which adds practical complexity but keeps the legislative text simple","Single effective date with no exceptions or alternative compliance methods"],"plain_english_summary":"This mandatory Airworthiness Directive applies to Cessna 680 (Citation Sovereign) jets serial numbers 0001–0021 and requires corrective work to address a Honeywell Primus Epic hardware/software fault that can cause all four cockpit displays to go blank. Operators must comply with FAA AD 2005‑08‑03 and Cessna SB680‑34‑03 Rev. 1 by the specified deadline. The AD protects against simultaneous loss of primary flight, navigation, autopilot, warnings, and GPS data—an acute safety hazard in instrument flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-680-2-honeywell-primus-epic-systems","history":"/api/acts/ad-cessna-680-2-honeywell-primus-epic-systems/history","analysis":"/api/acts/ad-cessna-680-2-honeywell-primus-epic-systems/analysis","conflicts":"/api/acts/ad-cessna-680-2-honeywell-primus-epic-systems/conflicts","importantCases":"/api/acts/ad-cessna-680-2-honeywell-primus-epic-systems/important-cases","documents":"/api/acts/ad-cessna-680-2-honeywell-primus-epic-systems/documents"}}