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B787 flight crew reported FMS VNAV system malfunction on arrival; and using vertical speed to fly the STAR.
| Attributes | |
| ACN | 1589725 |
| Time | |
| Date | 201810 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | LAX.Airport |
| State Reference | CA |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B787 Dreamliner Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | FMS/FMC |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument |
| Experience | Flight Crew Last 90 Days 100 Flight Crew Total 13000 Flight Crew Type 742 |
| Person 2 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument |
| Experience | Flight Crew Last 90 Days 210 Flight Crew Total 32800 Flight Crew Type 1037 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Altitude Crossing Restriction Not Met Deviation - Procedural Clearance |
Narrative:
During the descent phase into lax; on the GOATZ1 arrival; the FMS VNAV system would not work. Our first indication of this fact was that we never had a TOD when in the cruise phase. We were given a clearance to cross goatz at 16;000; but the FMS would not let us enter it; no matter what format we used. We also never had a vertical situation display. We were then given a clearance to descend via the GOATZ1. Part of the distraction to us was the fact that the ATIS said that 25L; the normal runway we would be given from that direction; was closed. During the course of our arrival we were given at least four runway changes between runway 25L and 25R. During the arrival; due to the fact that I was flying the altitude restrictions using flch and V/south; we crossed dirby lower than 16;000 and bufie higher than 8;000.
Original NASA ASRS Text
Title: B787 flight crew reported FMS VNAV system malfunction on arrival; and using vertical speed to fly the STAR.
Narrative: During the descent phase into LAX; on the GOATZ1 arrival; the FMS VNAV system would not work. Our first indication of this fact was that we never had a TOD when in the cruise phase. We were given a clearance to cross GOATZ at 16;000; but the FMS would not let us enter it; no matter what format we used. We also never had a Vertical Situation Display. We were then given a clearance to descend via the GOATZ1. Part of the distraction to us was the fact that the ATIS said that 25L; the normal runway we would be given from that direction; was closed. During the course of our arrival we were given at least four runway changes between runway 25L and 25R. During the arrival; due to the fact that I was flying the altitude restrictions using FLCH and V/S; we crossed DIRBY lower than 16;000 and BUFIE higher than 8;000.
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.