# SDR ASAA2021012733953

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 27, 2021
- Submitted: January 29, 2021
- Operation: Air carrier
- Aircraft: [N559AS](https://openairdocs.org/aircraft/N559AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35178
- Aircraft time: 51,383 hours, 15,197 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fmc
- Condition: Fault Message
- Location: Cowl Anti Valve
- Stage of operation: TX
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021012733953

## Discrepancy

CAPTAIN'S ND "FMC DISAGREE" ON GROUND.  GROUNDED-YES.  PERFORMED B737-800 FIM 34-61 TASK 835.  FOUND MISMATCH BETWEEN FMC NR 2 COWL ANTI VALVE, REF LG PG 60083689.  PERFORMED FMC BITE, PER FIM 34-61 TASK 801.  OPERATIONS NORMAL.

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