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After being cleared direct to mlb; a C421 pilot discovers that the autopilot has not maintained the direct course as selected on the garmin 530 and turns to intercept course. ATC takes note and states that an airliner had been off course in the opposite direction moments before.
| Attributes | |
| ACN | 1263153 |
| Time | |
| Date | 201505 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | SFB.Airport |
| State Reference | FL |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Golden Eagle 421 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | Climb |
| Route In Use | Direct |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | GPS & Other Satellite Navigation |
| Person 1 | |
| Function | Captain Single Pilot Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument |
| Experience | Flight Crew Last 90 Days 33 Flight Crew Total 1765 Flight Crew Type 25 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Clearance Deviation - Track / Heading All Types |
Narrative:
I was given direct to mlb and selected that on my garmin 530 and then selected navigation on the autopilot. After about 5 mins; I noticed I was right of course and getting worse. I then selected back on course and used heading mode to keep it back on course. I was called by ATC and asked what happened and I explained to controller and his supervisor. He said they had another incident just before mine with an airliner going opposite direction and he was off course in the opposite direction and so they seemed to think there was an abnormality with the GPS system going on. Within a few miles I was able to place the autopilot back in the navigation mode and it tracked fine with no problems.
Original NASA ASRS Text
Title: After being cleared direct to MLB; a C421 pilot discovers that the autopilot has not maintained the direct course as selected on the Garmin 530 and turns to intercept course. ATC takes note and states that an airliner had been off course in the opposite direction moments before.
Narrative: I was given direct to MLB and selected that on my Garmin 530 and then selected NAV on the autopilot. After about 5 mins; I noticed I was right of course and getting worse. I then selected back on course and used HDG mode to keep it back on course. I was called by ATC and asked what happened and I explained to controller and his supervisor. He said they had another incident just before mine with an airliner going opposite direction and he was off course in the opposite direction and so they seemed to think there was an abnormality with the GPS system going on. Within a few miles I was able to place the autopilot back in the NAV mode and it tracked fine with no problems.
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.