# SDR WWQA201211080001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 7, 2012
- Submitted: November 9, 2012
- Operation: Air carrier
- Aircraft: [N310EJ](https://openairdocs.org/aircraft/N310EJ), registered now
- Make and model: Gulstm GIV
- Aircraft serial: 1109
- Aircraft time: 8,723 hours, 3,542 cycles
- System (JASC): [3417 · Air Data Computer](https://openairdocs.org/jasc/3417)
- Part: Dadc
- Part number: 7000700964
- Part serial: 87072218
- Condition: Deactivated
- Location: Nr 1
- Part time: 1,570 hours, 660 cycles
- Stage of operation: AP
- How discovered: O
- Nature of condition: P
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/WWQA201211080001

## Discrepancy

DURING DESCENT, AT ABOUT 26000 FT, DADC 1 WENT OFF LINE, CAUSING LOSS OF VARIOUS SYSTEMS, AFTER EVALUATING THE SYSTEMS LOSS AND COMPAIRING ALTIMETERS,  IT WAS DETERMINED DADC 1 HAD GONE OFF LINE, DADC 2 SELECTED AND SYSTEM RESET.  ABOUT 30 SECONDS LATER DADC 2 WENT OFF LINE,  DECLARED AN EMERGENCY.   ABLE TO RESET DADC 2 AND RESET ALL SYSTEMS,  FLIGHT CONTINUED UNEVENTFUL AND LANDED WITHOUT INCIDENT.

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