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B767 pilot reports loss of captain's ADI at cruise altitude on an ETOPS flight. No associated faults are noted and the ADI is regained using the IRS alternate switch; however the crew elects to divert for maintenance.
| Attributes | |
| ACN | 1076418 |
| Time | |
| Date | 201303 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | Marginal |
| Aircraft 1 | |
| Make Model Name | B767-300 and 300 ER |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Component | |
| Aircraft Component | PFD |
| Person 1 | |
| Function | Pilot Flying |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
Approx 2 hours into the flight at cruise altitude [we] experienced a loss of the captian's ADI. Screen went blank (flat panel) along with pitch and roll flags on the first officer's ADI. There were no other associated failures that could pinpoint the root cause of the failure. We were able to 'bootstrap' the captain's ADI via the IRS alt switch; but due to a concern over the unknown cause of our degraded directional and attitude reference; we declared an emergency with center and diverted. Overweight landing at 329;000; min sink rate landing; no auto brakes; min braking with a landing rollout of 11;000 plus ft. As a side note; a possible cause of the gyro failure was a lighting storm in the vicinity. The failure was coincidental with a period of st. Elmo's fire visible in the cockpit.
Original NASA ASRS Text
Title: B767 pilot reports loss of Captain's ADI at cruise altitude on an ETOPS flight. No associated faults are noted and the ADI is regained using the IRS alternate switch; however the crew elects to divert for maintenance.
Narrative: Approx 2 hours into the flight at cruise altitude [we] experienced a loss of the Captian's ADI. Screen went blank (Flat Panel) along with PITCH and ROLL flags on the First Officer's ADI. There were no other associated failures that could pinpoint the root cause of the failure. We were able to 'bootstrap' the Captain's ADI via the IRS alt switch; but due to a concern over the unknown cause of our degraded directional and attitude reference; we declared an emergency with Center and diverted. Overweight landing at 329;000; min sink rate landing; no auto brakes; min braking with a landing rollout of 11;000 plus FT. As a side note; a possible cause of the gyro failure was a lighting storm in the vicinity. The failure was coincidental with a period of St. Elmo's fire visible in the cockpit.
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.