# SDR ASAA2022031837718

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 18, 2022
- Submitted: March 21, 2022
- Operation: Air carrier
- Aircraft: [N428AS](https://openairdocs.org/aircraft/N428AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36353
- Aircraft time: 22,122 hours, 6,987 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: CR
- 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/ASAA2022031837718

## Discrepancy

IN CRUISE, MESSAGE 'SINGLE FMC OPERATION' ON R SCRATCHPAD AND VTK ON R MAP DISPLAY. LNAV / VNAV DISENGAGED ON R A/P. CORRECTED ITSELF BEFORE ANY PILOT INTERVENTION WITHIN FEW MIN. GROUNDED - YES. SYS LOGGED 'FMC-R PRES POS LAT RATE' LAST LEG. FAULT NO LONGER PRESENT. SYS OPS CKS NML PER SAME B737-900AMM 34-61-00. GND VERIFICATION SUCCESSFUL.

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