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B777 flight crew reported after takeoff the standby artificial horizon was not giving any altitude or airspeed information.
| Attributes | |
| ACN | 1590622 |
| Time | |
| Date | 201811 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B777 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Takeoff |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Airspeed Indicator |
| Person 1 | |
| Function | Dispatcher First Officer Pilot Not Flying Other / Unknown |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 233 Flight Crew Total 15462 Flight Crew Type 1594.3 |
| Person 2 | |
| Function | Dispatcher First Officer Pilot Not Flying Other / Unknown |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 140 Flight Crew Total 5546.3 Flight Crew Type 3840.2 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
We had a mechanical (no airspeed or altitude on our isfd) that we as a crew decided it was not a safe action to continue to fly across the atlantic at night IMC. We had great communication with dispatch; [maintenance] and the fleet manager. The [decision] of the fleet manager/[operations] was to continue. We as a crew felt that it was not safe so we did and air return back to ZZZ. I am still wondering why they think it was ok to continue as if we were left with only the isfd we would only have attitude but no airspeed or altitude. We ran all the checklists; took things slow; properly handled the situation in a calm professional manor. The one thing we did do was dump an extra 15K (estimate) of fuel. We did not land over weight but we landed probably 10-20 K lbs under max landing weight.
Original NASA ASRS Text
Title: B777 flight crew reported after takeoff the standby artificial horizon was not giving any altitude or airspeed information.
Narrative: We had a mechanical (No Airspeed or ALT on our ISFD) that we as a crew decided it was not a safe action to continue to fly across the Atlantic at night IMC. We had great communication with dispatch; [maintenance] and the Fleet manager. The [decision] of the fleet manager/[operations] was to continue. We as a crew felt that it was not safe so we did and air return back to ZZZ. I am still wondering why they think it was OK to continue as if we were left with only the ISFD we would only have attitude but no Airspeed or Altitude. We ran all the checklists; took things slow; properly handled the situation in a calm professional manor. The one thing we did do was dump an extra 15K (estimate) of fuel. We did not land over weight but we landed probably 10-20 K lbs under Max Landing weight.
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.