# SDR DALA2015020400898

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 3, 2015
- Submitted: February 5, 2015
- Operation: Air carrier
- Aircraft: N976DL
- Make and model: Doug MD-88
- Registry model: [Doug MD-88](https://openairdocs.org/model/mcdonnell-douglas-md-88) (OpenAirDocs)
- Aircraft serial: 53257
- Aircraft time: 62,724 hours, 46,213 cycles
- System (JASC): [3440 · Independent Position Determining System](https://openairdocs.org/jasc/3440)
- Part: Iru
- Condition: Failed
- Location: Nr 1
- Stage of operation: CR
- How discovered: O
- Nature of condition: G
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2015020400898

## Discrepancy

CREW DIVERTED AFTER THE NR 1 PRIMARY FLIGHT DISPLAY FAILED AND BOTH NAVIGATION DISPLAYS WERE DEEMED UNRELIABLE WITH EXCESSIVE HEADING DISCREPANCIES.  MAINTENANCE REPLACED THE NR 1 IRU AND ALSO THE R2-47 EMERGENCY AC POWER TRANSFER RELAY AND R2-100 DFGC TRANSFER RELAY AS A PRECAUTION.  NO OTHER DISCREPANCIES WERE NOTED AND A SUCCESSFUL RETURN TO SERVICE CHECK WAS PERFORMED ON BOTH DFGCS IAW AMM 22-01.

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