{"id":"F2006L02221","name":"AD/F2000/18 - Segregation of ADC/IRS Wiring","slug":"ad-f2000-18-segregation-of-adc-irs-wiring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":117548,"registerId":"commonwealth-F2006L02221-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Dassault Aviation Falcon 2000 Series Aer","sectionType":"division","heading":"Dassault Aviation Falcon 2000 Series Aeroplanes","content":"### Dassault Aviation Falcon 2000 Series Aeroplanes\n\n| AD/F2000/18 | Segregation of ADC/IRS Wiring | 8/2006 |\n| ----------- | ----------------------------- | ------ |\n\n| Applicability: | Falcon 2000EX EASy serial numbers (S/N) 06, 28 and subsequent. |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. For F2000EX EASy aeroplanes in the applicability range and without modification M2758 - Incorporate IRS 2 wiring modification M2758 and test the GP bus IRS entry in accordance with the accomplishment instructions of Service Bulletin SB-F2000EX-89 or later revisions approved by the European Aviation Safety Agency (EASA). |\n| | 2. For all F2000EX EASy aeroplanes in the applicability range - Amend the Falcon 2000EX EASy Maintenance Manual to introduce MP 34-209 \"test of general purpose bus IRS entry\" at 5000 FH intervals by inserting Revision 2 of Chapter 5.40 into the manual. |\n| | 3. For all F2000EX EASy aeroplanes in the applicability range - Amend the applicable Minimum Equipment List (MEL) to reflect the dispatch conditions for ‘one IRS failure’ contained in the Dassault Aviation Master Minimum Equipment List temporary change TC 4. |\n| | Note: EASA AD 2006-0157 refers. |\n| Compliance: | For Requirements 1, 2 and 3 - At the earliest opportunity but no later than three months after the effective date of this Directive. |\n| | This Airworthiness Directive becomes effective on 3 August 2006. |\n| Background: | During a flight test performed on an EASy aircraft, and subsequent to an air data probe failure, the crew realized that the Flight path vectors and the Vertical speeds that were displayed on pilot's and co-pilot's PDU were identically wrong.A review of the EASy architecture reveals that the current wiring of Air Data System (ADS) and IRS units is not compliant with the certified safety objectives.All IRS primary inputs are wired to the same General Purpose (GP) Bus and thus the basic requirements for ADS segregation are not met. One single ADS unflagged air data error may lead to the computation and display on both pilot's and co-pilot's display units of unnoticed and misleading flight information.At take-off or during go-around this situation might considerably reduce flight safety. |\n\n| | This Directive mandates a wiring modification of IRS 2 and a test of General Purpose bus IRS entry. Furthermore in order to maintain ADS parameter segregation against possible failures, the Directive also requires operators to comply with the amendments made to Chapter 5.40 of Aircraft Maintenance Manuals that contain an additional periodic functional test of the IRS GP Bus I/O.Dispatch conditions under MMEL in case of an IRS2 failure are modified after implementation of the wiring change. |\n| --- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n22 June 2006","sortOrder":0},{"sectionNumber":"AD/F2000/18","sectionType":"part","heading":"AD/F2000/18","content":"## AD/F2000/18","sortOrder":1},{"sectionNumber":"Segregation of ADC/IRS Wiring","sectionType":"part","heading":"Segregation of ADC/IRS Wiring","content":"## Segregation of ADC/IRS Wiring","sortOrder":2},{"sectionNumber":"8/2006","sectionType":"part","heading":"8/2006","content":"## 8/2006","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD maintains its original narrow scope — addressing a specific wiring segregation issue in a specific aircraft model. The three requirements (hardware modification, maintenance procedure update, and documentation amendment) all directly serve the single safety purpose of ensuring ADS/IRS segregation. No scope creep is evident."},"complexity_factors":["Highly technical aviation terminology (IRS, ADS, GP Bus, PDU, MEL, MMEL) requiring specialized knowledge","Specific serial number applicability creating a narrow but precise scope","Three distinct compliance requirements with different implementation paths (modification vs. documentation updates)","Cross-reference to European regulator (EASA AD 2006-0157) and specific service bulletin (SB-F2000EX-89)","Conditional logic: Requirement 1 only applies to aircraft 'without modification M2758' while Requirements 2 and 3 apply to all aircraft in the range","Specific technical procedure references (MP 34-209, Chapter 5.40, TC 4) that require external documents for full implementation"],"plain_english_summary":"This mandatory CASA Airworthiness Directive requires certain Dassault Falcon 2000EX EASy jets (S/N 06, 28 and subsequent) to fix a hazardous wiring arrangement that can let a single sensor failure feed identical, incorrect Air Data and IRS information to both pilot displays. \n\nOperators must rewire to separate IRS 2, add a recurring 5,000‑hour test to maintenance manuals, and update equipment lists. Work was required within three months of 3 August 2006 to eliminate the single point of failure."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive's scope matches its stated safety objective: it mandates IRS‑2 wiring segregation, a periodic GP bus IRS entry test, and MEL updates for the specified Falcon 2000EX EASy serial numbers. It does not expand applicability beyond those aircraft or add unrelated regulatory obligations."},"complexity_factors":["Technical wiring modification (M2758) requiring work per Dassault service instructions and EASA‑approved SB-F2000EX-89 or later revisions.","Introduction of a new recurrent maintenance task (MP 34-209) at a 5,000 flight‑hour interval into the Maintenance Manual.","Amendment of the operator's MEL to adopt Dassault Master MMEL temporary change TC 4 dispatch conditions for one IRS failure.","Short compliance window: all actions required at the earliest opportunity but no later than three months after the effective date.","Applicability limited to specific airframe serial numbers (F2000EX EASy S/N 06, 28 and subsequent), creating a mixed fleet compliance environment.","Mandatory testing of the GP bus IRS entry involves diagnostic procedures and potential access to avionics systems, adding labour and downtime.","Reference and alignment with EASA AD 2006‑0157 implies coordination with foreign certifying authority documentation and approvals."],"plain_english_summary":"Requires Dassault Falcon 2000EX EASy operators (S/N 06, 28 and later) to install IRS‑2 wiring modification M2758 if not already fitted, add a 5,000 flight‑hour functional test of the General Purpose (GP) bus IRS entry to the maintenance manual, and update the Minimum Equipment List to reflect dispatch conditions for a single IRS failure. Compliance is required within three months. The stated purpose is to segregate air‑data/IRS wiring so a single unflagged air‑data fault cannot produce identical, misleading flight‑path displays on both pilot and co‑pilot screens."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-f2000-18-segregation-of-adc-irs-wiring","history":"/api/acts/ad-f2000-18-segregation-of-adc-irs-wiring/history","analysis":"/api/acts/ad-f2000-18-segregation-of-adc-irs-wiring/analysis","conflicts":"/api/acts/ad-f2000-18-segregation-of-adc-irs-wiring/conflicts","importantCases":"/api/acts/ad-f2000-18-segregation-of-adc-irs-wiring/important-cases","documents":"/api/acts/ad-f2000-18-segregation-of-adc-irs-wiring/documents"}}