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Both fmcs quit on a B747-400's oceanic flight but the crew was able to restore them with minimal track deviation.
| Attributes | |
| ACN | 963326 |
| Time | |
| Date | 201108 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B747-400 |
| 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 Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 240 Flight Crew Total 18000 Flight Crew Type 5000 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Track / Heading All Types |
Narrative:
During cruise; we suddenly lost both fmcs; autopilots; autothrottles; map displays; and other systems. After a few minutes we were able to restore all systems. During the event; we drifted about 5 NM left of course. We advised dispatch to notify ATC; who stated all was fine. Maintenance was contacted and stated that this aircraft has a history of losing both fmcs. There were no other aircraft in our vicinity.
Original NASA ASRS Text
Title: Both FMCs quit on a B747-400's oceanic flight but the crew was able to restore them with minimal track deviation.
Narrative: During cruise; we suddenly lost both FMCs; autopilots; autothrottles; map displays; and other systems. After a few minutes we were able to restore all systems. During the event; we drifted about 5 NM left of course. We advised Dispatch to notify ATC; who stated all was fine. Maintenance was contacted and stated that this aircraft has a history of losing both FMCs. There were no other aircraft in our vicinity.
Data retrieved from NASA's ASRS site as of April 2012 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.