# SDR ASAA2013040294323

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 2, 2013
- Submitted: April 5, 2013
- Operation: Air carrier
- Aircraft: [N538AS](https://openairdocs.org/aircraft/N538AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 41188
- Aircraft time: 3,455 hours, 995 cycles
- System (JASC): [3400 · Navigation System](https://openairdocs.org/jasc/3400)
- Part: Unknown
- Condition: Unknown
- Stage of operation: NR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2013040294323

## Discrepancy

FLAG ON F/O ND LT NAV DISENGAGED. WHILE ATTEMPTING TO RUN QRH, CONDITION DISAPPEARED.  DFCS BITE LOGGED FMC DATA FAULT, FMC BITE LOGGED INTERMITTENT POSITION FAULT.   ACCOMPLISHED FMC OPS TEST IAW 34-61-00 AND DFCS LRU REPLACEMENT TEST FOR FMC, ALL CHECKED NORMAL.   ACFT REMAINS CAT III AUTOLAND/HGS, SCREW REFLECTS SAME.

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