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When both fmcs ceased to function shortly after takeoff the flight crew of a B-717 opted to declare an emergency and return to their departure airport. They landed safely; 6;000 pounds overweight.
| Attributes | |
| ACN | 1199376 |
| Time | |
| Date | 201408 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B717 (Formerly MD-95) |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Weight And Balance |
Narrative:
After takeoff with prof and navigation armed; the 'magenta line' disappeared. At approximately 3;000 MSL; the throttles reduced to idle and were initially unresponsive. After selecting 'prof' again; the autothrottles returned. Both FMS's were totally unresponsive and we were not able to navigate to any fix. We then decided to return to our departure airport and also realized we were overweight by 6;000 pounds. We then declared an emergency and landed uneventfully. We were not able to change the destination nor were we able to hard tune the ILS frequency for the approach.
Original NASA ASRS Text
Title: When both FMCs ceased to function shortly after takeoff the flight crew of a B-717 opted to declare an emergency and return to their departure airport. They landed safely; 6;000 pounds overweight.
Narrative: After takeoff with PROF and NAV armed; the 'magenta line' disappeared. At approximately 3;000 MSL; the throttles reduced to idle and were initially unresponsive. After selecting 'prof' again; the autothrottles returned. Both FMS's were totally unresponsive and we were not able to navigate to ANY fix. We then decided to return to our departure airport and also realized we were overweight by 6;000 pounds. We then declared an emergency and landed uneventfully. We were not able to change the destination nor were we able to hard tune the ILS frequency for the approach.
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.