# SDR CMRR200610023

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 23, 2006
- Submitted: October 31, 2006
- Operation: General aviation
- Aircraft: [N420FJ](https://openairdocs.org/aircraft/N420FJ), registered now
- Make and model: Dorner DO328300
- Aircraft serial: 3178
- Aircraft time: 8,290 hours, 8,753 cycles
- Engine: Pwa PW306B
- System (JASC): [3160 · Central Display](https://openairdocs.org/jasc/3160)
- Part: Power Supply
- Part number: 7018704902
- Condition: Failed
- Location: Efis
- Part time: 8,290 hours, 8,753 cycles
- Component: Display Unit, Honeywell, DU870
- Component part number: 7014300902
- Stage of operation: IN
- How discovered: V
- Nature of condition: H
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CMRR200610023

## Discrepancy

THE NR 4 MFD DISPLAY UNIT REFERENCED HEREIN FAILED DURING GROUND OPERATIONS.  THE SUSPECTED SPECIFIC COMPONENT FAILURE IS THE HIGH VOLTAGE POWER SUPPLY UNIT P/N:7018704-902 INSTALLED INSIDE THE CRT DISPLAY UNIT.  FURTHER INSPECTION WILL BE REQUIRED TO VERIFY THE EXACT CAUSE OF THE DU FAILURE.

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