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AD/F2000/18 - Segregation of ADC/IRS Wiring
Dassault Aviation Falcon 2000 Series AerDassault Aviation Falcon 2000 Series Aeroplanes
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Dassault Aviation Falcon 2000 Series Aeroplanes
| AD/F2000/18 | Segregation of ADC/IRS Wiring | 8/2006 |
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| Applicability: | Falcon 2000EX EASy serial numbers (S/N) 06, 28 and subsequent. |
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| 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). |
| 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. | |
| 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. | |
| Note: EASA AD 2006-0157 refers. | |
| Compliance: | For Requirements 1, 2 and 3 - At the earliest opportunity but no later than three months after the effective date of this Directive. |
| This Airworthiness Directive becomes effective on 3 August 2006. | |
| 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. |