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Md-82 captain reported both FMS's locked up for an unspecified period of time; but then returned to normal operation.
| Attributes | |
| ACN | 1350878 |
| Time | |
| Date | 201604 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | MD-82 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Route In Use | Oceanic |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
Last evening both FMS's involuntarily went to the menu page. I consulted the QRH; but no procedure seemed to fit the behavior observed in the FMS's. I played with the FMS for several minutes. I couldn't get it to unlock itself. When I felt that I had exhausted all options; I felt that it wasn't a good idea to continue to [destination] in this condition. I [advised ATC and] diverted to [a nearby alternate]. However after going into heading select the FMS anomaly corrected itself. I cannot explain why. That is a mystery. I still had enough fuel to make [the original destination]; so I decided to continue. I brought all of this to the attention of ATC. The rest of the flight was uneventful.
Original NASA ASRS Text
Title: MD-82 Captain reported both FMS's locked up for an unspecified period of time; but then returned to normal operation.
Narrative: Last evening both FMS's involuntarily went to the menu page. I consulted the QRH; but no procedure seemed to fit the behavior observed in the FMS's. I played with the FMS for several minutes. I couldn't get it to unlock itself. When I felt that I had exhausted all options; I felt that it wasn't a good idea to continue to [destination] in this condition. I [advised ATC and] diverted to [a nearby alternate]. However after going into heading select the FMS anomaly corrected itself. I cannot explain why. That is a mystery. I still had enough fuel to make [the original destination]; so I decided to continue. I brought all of this to the attention of ATC. The rest of the flight was uneventful.
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.