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A C550 developed a 30 degree track error apparently caused by a faulty GPS which was reset and resulted in normal route tracking.
| Attributes | |
| ACN | 1012110 |
| Time | |
| Date | 201205 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Citation II/SP (C551) |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Cruise |
| Route In Use | Direct |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | AHRS/ND |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Flight Instructor Flight Crew Instrument |
| Experience | Flight Crew Last 90 Days 150 Flight Crew Total 10000 Flight Crew Type 500 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Track / Heading All Types |
Narrative:
While en route; approximately 440 nautical miles to the southwest of our destination; our GPS appeared to provide erroneous information. While the GPS unit itself displayed an accurate position; the information relayed to the HSI and multifunction display was ultimately erroneous in terms of what information the flight crew received. Ultimately we were queried by center controllers that we were proceeding 30 degrees off course. At that point we checked our GPS against the on-board VOR's and confirmed that we were proceeding off course. At that point we reset the GPS after which it appeared to function properly. We continued to monitor it against the VOR receivers with no further errors being detected.
Original NASA ASRS Text
Title: A C550 developed a 30 degree track error apparently caused by a faulty GPS which was reset and resulted in normal route tracking.
Narrative: While en route; approximately 440 nautical miles to the southwest of our destination; our GPS appeared to provide erroneous information. While the GPS unit itself displayed an accurate position; the information relayed to the HSI and multifunction display was ultimately erroneous in terms of what information the flight crew received. Ultimately we were queried by Center controllers that we were proceeding 30 degrees off course. At that point we checked our GPS against the on-board VOR's and confirmed that we were proceeding off course. At that point we reset the GPS after which it appeared to function properly. We continued to monitor it against the VOR receivers with no further errors being detected.
Data retrieved from NASA's ASRS site as of July 2013 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.