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B747 captain reported multiple FMS failures that resulted in a diversion.
| Attributes | |
| ACN | 1711758 |
| Time | |
| Date | 201912 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B747-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
Approximately 3 hours after takeoff; STAR & approach updated. We noted prog P2/2 no destination ETA and fuel remaining values. Also; no fuel values for fuel used on engines 1-4. Wind altitude & OAT inserted. Shortly thereafter; captain legs page blanked then restored. Then dual FMC failure - right FMC vtk; then LNAV- VNAV-ats failures.; with CDU message timeout-reselect displayed. As pilot monitoring; I reinserted data into perf init.; route; legs pages. Normal operation for a while; then thereafter; 3 more dual FMC failures. After 4th failure; I was unable to restore FMC ops. QRH cl accomplished. ATC was advised. ATC rvs requested. Normal flight thereafter today VMC approach runway xl ZZZ.suggestions: upgrade legacy fmcs to ng. Continuous training.
Original NASA ASRS Text
Title: B747 Captain reported multiple FMS failures that resulted in a diversion.
Narrative: Approximately 3 hours after takeoff; STAR & APPROACH updated. We noted PROG P2/2 no destination ETA and FUEL REMAINING values. Also; no fuel values for fuel used on engines 1-4. Wind ALT & OAT inserted. Shortly thereafter; Captain LEGS page blanked then restored. Then DUAL FMC FAILURE - Right FMC VTK; then LNAV- VNAV-ATS failures.; with CDU message TIMEOUT-RESELECT displayed. As Pilot Monitoring; I reinserted data into perf init.; route; legs pages. Normal operation for a while; then thereafter; 3 more dual FMC failures. After 4th failure; I was unable to restore FMC ops. QRH CL accomplished. ATC was advised. ATC RVs requested. Normal flight thereafter today VMC APPROACH Runway XL ZZZ.Suggestions: Upgrade legacy FMCS to NG. Continuous training.
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.