# SDR ASAA2022031337686

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 13, 2022
- Submitted: March 15, 2022
- Operation: Air carrier
- Aircraft: [N596AS](https://openairdocs.org/aircraft/N596AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35688
- Aircraft time: 49,843 hours, 14,858 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- Stage of operation: LD
- 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/ASAA2022031337686

## Discrepancy

AFTER LANDING "FMC" INDICATION GONE FROM FMC MENU. RETURNS BRIEFLY AND THEN GOES AWAY. AFFECTING BOTH FMC'S. GROUNDED - YES. UNABLE TO DUPLICATE DEFECT: FMCS BITE SHOWED EACH FMC RECORDED THE SAME FAULTS FOR THE OTHER FMC ON LEG 2: "GENERAL DATA SYNC ERROR" AND "FCC DATA SYNC ERROR". PERFORMED T/S PER B737-800 FIM 34-61 TASK 836 - INITIAL EVALUATION DID NOT CONFIRM FAULT. PERFORMED FMCS OPERATIONAL TEST PER B737-800 AMM 34-61-00-710-801 - ALL TESTS PASS.

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