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B737NG first officer reported returning to the departure airport after experiencing multiple navigation display anomalies.
| Attributes | |
| ACN | 1392049 |
| Time | |
| Date | 201610 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZZ.Airport |
| State Reference | FO |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B737 Next Generation Undifferentiated |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Flight Dynamics |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Type 5013 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
We had previously returned to the gate after engine start with a deu (display electronics unit) failure. Maintenance reset the system and believed to have fixed the issue. During climbout and at cruise the lower engine display stowed itself several times without command. Then the first officer's speed tape blanked with an altitude flag that corrected itself. Shortly thereafter both sides showed a display source flag. We consulted with dispatch/mx and decided to return to [the departure airport] instead of continuing into highly mountainous terrain with unreliable instruments. An overweight landing was made and was smooth.
Original NASA ASRS Text
Title: B737NG First Officer reported returning to the departure airport after experiencing multiple navigation display anomalies.
Narrative: We had previously returned to the gate after engine start with a DEU (Display Electronics Unit) failure. Maintenance reset the system and believed to have fixed the issue. During climbout and at cruise the lower engine display stowed itself several times without command. Then the First Officer's speed tape blanked with an ALT flag that corrected itself. Shortly thereafter both sides showed a DISPLAY SOURCE flag. We consulted with Dispatch/MX and decided to return to [the departure airport] instead of continuing into highly mountainous terrain with unreliable instruments. An overweight landing was made and was smooth.
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.