# SDR ASAA2021070335242

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 3, 2021
- Submitted: July 7, 2021
- Operation: Air carrier
- Aircraft: [N529AS](https://openairdocs.org/aircraft/N529AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35198
- Aircraft time: 39,943 hours, 11,784 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fmc
- Condition: Malfunctioned
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021070335242

## Discrepancy

IN CLIMB OUT WITH FO F/D ON MASTER VNAV DISENGAGED AND LNAV TRACK DISAPPEARED FROM FO NAV DISPLAY. "SINGLE FMC OPERATION" IN FO SCRATCHPAD WITHOUT ANY INDICATIONS OTHER THAN FMC P/RST. FMC RESTORED ON ITS OWN WITHIN APPROX 3 MIN. GROUNDED - YES. DFCS HISTORY BITE SHOWED FAULT CODE 22-11822. T/S PER B737-800 FIM 22-11 TASK 811 - OPS NML. OK FOR SVC. FMC OPS NML - DUAL LAND PASS PER AMM AND FMC TEST PASS PER B737-800 AMM 34-61-00.

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