# SDR 99UAL900054

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 20, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N411UA
- Make and model: Airbus A320-232
- Registry model: [Airbus A320-232](https://openairdocs.org/model/airbus-a320-232) (OpenAirDocs)
- Aircraft serial: 464
- Engine: Iae V2527A5
- System (JASC): [2211 · Autopilot Computer](https://openairdocs.org/jasc/2211)
- Part: Circuit Breaker
- Condition: Tripped
- Location: Nr 1 & 2 Fmgc
- Stage of operation: NR
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99UAL900054

## Discrepancy

MCDU NR 1 & 2 BLACKED OUT SEVERAL TIMES FOR SEVERAL MINUTES INDEPENDENTLY AND CAME BACK ON THEIR OWN. NR 2 FLIGHT DIRECTOR SEEMED TO WANDER BOTH VERTICALLY AND LATERALLY 300 FEET. *S/D*  RESET FMGC 1 AND 2  CB'S, OPS CHECKS NORMAL.  NO ADDITIONAL PROBLEMS HAVE BEEN IDENTIFIED.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.