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Ce-560XL captain reported a loss of all GPS/IRS input to the aircraft's FMS during cruise.
| Attributes | |
| ACN | 1711505 |
| Time | |
| Date | 201912 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | Citation Excel (C560XL) |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Cruise |
| Route In Use | Direct |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Track / Heading All Types |
Narrative:
About an hour into our flight near zzzzz intersection we received a degraded message on our honeywell FMS. This was followed by a dr or dead reckoning annunciation. The honeywell FMS manual defines dr mode as follows: 'dr mode is defined as the loss of radio updating and all other position sensors (IRS and GPS).' when we looked at our GPS sensor page which normally shows the coordinates; the GPS sensor coordinates were blank. We then asked ATC if they showed us on course and they informed us that we were off by 5 NM. We then got vectors until we could pick up the ZZZ VOR with short range needles. The rest of the flight was flown using short range navigation. After approximately 30 minutes after the FMS issue we powered the FMS down and powered it back up but still had the same problem for 20 minutes or; so then the previous annunciations went away. We monitored the FMS and at times it appeared to be off course when comparing it to our VOR course. We landed uneventfully and wrote up the FMS.suggestions: a dual FMS configuration would have given us a backup other than short range nav.
Original NASA ASRS Text
Title: CE-560XL Captain reported a loss of all GPS/IRS input to the aircraft's FMS during cruise.
Narrative: About an hour into our flight near ZZZZZ Intersection we received a Degraded message on our Honeywell FMS. This was followed by a DR or dead reckoning annunciation. The Honeywell FMS manual defines DR mode as follows: 'DR mode is defined as the loss of radio updating and all other position sensors (IRS and GPS).' When we looked at our GPS sensor page which normally shows the coordinates; the GPS sensor coordinates were blank. We then asked ATC if they showed us on course and they informed us that we were off by 5 NM. We then got vectors until we could pick up the ZZZ VOR with short range needles. The rest of the flight was flown using short range NAV. After approximately 30 minutes after the FMS issue we powered the FMS down and powered it back up but still had the same problem for 20 minutes or; so then the previous annunciations went away. We monitored the FMS and at times it appeared to be off course when comparing it to our VOR course. We landed uneventfully and wrote up the FMS.Suggestions: A dual FMS configuration would have given us a backup other than short range nav.
Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.