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B737-800 captain reported returning to departure airport after experiencing a dual FMC failure.
| Attributes | |
| ACN | 1614810 |
| Time | |
| Date | 201901 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine |
| Experience | Flight Crew Total 20000 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
Dual FMC (flight management computer) failure. We thought the FMC's would come back in a minute or two; but they did not. We called center and asked for vectors back to [departure airport]; explaining our dual FMC failure. We went through QRH procedures; but were unable to recover the FMC's. Ca (captain) screen was blank. First officer (first officer) could see airport identifiers on his. We had a vtk (vertical track) and landing alt amber lights on the pfd (primary flight display). About 35-40 minutes later; ACARS messages started printing indicating to me; the aircraft thought it was on the ground. I got a close-out deleted and expired messages. I had selected both FMC's to first officer side as per QRH with that side giving best information. After the close out deleted message; I was able to reload the perf init page and everything came back to normal; except the amber landing alt and no amber hook on ca side. We continued to [departure airport] and landed uneventfully.I suspect the aircraft had a failure which may have been caused by system failure indicating we were on the ground. Or perhaps that was a result of another failure with the FMC's.
Original NASA ASRS Text
Title: B737-800 Captain reported returning to departure airport after experiencing a dual FMC failure.
Narrative: Dual FMC (Flight Management Computer) failure. We thought the FMC's would come back in a minute or two; but they did not. We called Center and asked for vectors back to [departure airport]; explaining our dual FMC failure. We went through QRH procedures; but were unable to recover the FMC's. CA (Captain) screen was blank. FO (First Officer) could see airport identifiers on his. We had a VTK (Vertical track) and Landing Alt amber lights on the PFD (Primary Flight Display). About 35-40 minutes later; ACARS messages started printing indicating to me; the aircraft thought it was on the ground. I got a close-out deleted and expired messages. I had selected both FMC's to FO side as per QRH with that side giving best information. After the close out deleted message; I was able to reload the Perf Init page and everything came back to normal; except the amber landing alt and no amber hook on CA side. We continued to [departure airport] and landed uneventfully.I suspect the aircraft had a failure which may have been caused by system failure indicating we were on the ground. Or perhaps that was a result of another failure with the FMC's.
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.