# SDR ASAA2014081208826

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 12, 2014
- Submitted: August 15, 2014
- Operation: Air carrier
- Aircraft: [N589AS](https://openairdocs.org/aircraft/N589AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35686
- Aircraft time: 25,602 hours, 7,849 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Indication Sys
- Condition: Malfunctioned
- Location: Vnav
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2014081208826

## Discrepancy

VNAV DISCONNECT IN FLIGHT, SPEED AND ALTITUDE DATA WAS TEMPORARY UNAVAILABLE IN THE FMC.  EVENTUALLY THE DATA WAS RESTORED AND WAS ABLE TO UTILIZE VNAV. LAST 1 & .5 HRS WAS FINE.  VNAV OPERATED NORMALLY.  ACFT GROUNDED.  ACCOMPLISHED FMCS FIM TASK 34-61 NR 801, NO FAULTS OR FAILURES.  FMCS BITE CHECKS & OPS CKS OK REF AMM 34-61-00-710-801.

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