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Air carrier on initial climb experienced a digital flight guidance failure on both systems resulting in a return to the departure airport.
| Attributes | |
| ACN | 1050607 |
| Time | |
| Date | 201211 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Climb |
| Component | |
| Aircraft Component | Navigational Equipment and Processing |
| Person 1 | |
| Function | Pilot Flying |
| Person 2 | |
| Function | Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
I was pilot flying with autopilot off departing ZZZ for sjc. At 'about' 3;000 ft in the westbound turn on the RNAV departure both digital flight guidance computers (dfgc) kicked off leaving me with blank FMA; no autothrottle or autopilot if I wanted it; no CDI; no altitude pre-select/alerted and a few other items. I said I was unable RNAV departure and need a heading. After a bit of trouble shooting with no luck; we were unable to restore the dfgc's it was decided to return to departure airport. An emergency was declared and we received heading and altitudes back to ZZZ in VMC. After a smooth landing we taxied back to the gate and switched airplanes.
Original NASA ASRS Text
Title: Air Carrier on initial climb experienced a digital flight guidance failure on both systems resulting in a return to the departure airport.
Narrative: I was pilot flying with autopilot OFF departing ZZZ for SJC. At 'about' 3;000 FT in the westbound turn on the RNAV departure both digital flight guidance computers (DFGC) kicked off leaving me with blank FMA; no autothrottle or autopilot if I wanted it; no CDI; no altitude pre-select/alerted and a few other items. I said I was unable RNAV departure and need a heading. After a bit of trouble shooting with no luck; we were unable to restore the DFGC's it was decided to return to departure airport. An emergency was declared and we received heading and altitudes back to ZZZ in VMC. After a smooth landing we taxied back to the gate and switched airplanes.
Data retrieved from NASA's ASRS site as of July 2013 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.