# SDR SWIA200412890

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 10, 2004
- Submitted: February 21, 2004
- Operation: Air carrier
- Aircraft: [N439SW](https://openairdocs.org/aircraft/N439SW), registered now
- Make and model: Cndair CL6002B19
- Aircraft serial: 7578
- Aircraft time: 6,282 hours, 4,821 cycles
- System (JASC): [3170 · Automatic Data](https://openairdocs.org/jasc/3170)
- Part: Dcu
- Part number: 6229820009
- Part serial: GP4W
- Condition: Malfunctioned
- Location: Cockpit
- Part time: 230 hours, 167 cycles
- Stage of operation: NR
- How discovered: O
- Nature of condition: J, F
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWIA200412890

## Discrepancy

NR 1 PFD WENT BLANK FOLLOWED BY A NR 1 YAW DAMPER DISCONNECT AND AUTO PILOT DISCONNECT.  BOTH RE-ENGAGED.  REMOVED AND REPLACED NR1 PFD IAW 31-61-4.  OPS CHECK GOOD.  RETURNED TO CAT II.  REMOVED AND REPLACED NR 1 DCU FOR NUMEROUS DCU FAILS IN MDC IAW 31-41-04.  PFD P/N:  622-9810-016, S/N OFF: 10DRR.

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