# SDR ASAA2020013082025

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 28, 2020
- Submitted: January 31, 2020
- Operation: Air carrier
- Aircraft: [N530AS](https://openairdocs.org/aircraft/N530AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 36578
- Aircraft time: 38,238 hours, 11,239 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fmc
- Condition: Malfunctioned
- Location: Right
- Stage of operation: CR
- 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/ASAA2020013082025

## Discrepancy

ABOUT 3 HRS INTO FLT, THE A/T LIM ANNUNCIATED ABOVE ENGINE CLUSTER,  VNAV DISCONNECTED. IAW PREVIOUS WRITE UP LOG PAGE 12089346 JUST AFTER BEGINNING DESCENT A/T LIM WENT AWAY. FMC RETURNED TO NORMAL. VNAV AVAILABLE. GROUNDED - YES. PERFORMED BOTH LEFT AND RIGHT HAND FMC BITE PROCEDURE IAWFIM 34-61 TASK 801. FOUND INFLIGHT FAULT. BOTH IRS HAVE TAT- REASON PERFORMED FIM 34-61 TASK 824 ALSO FIM 34-21 TASK 801 IRS BITE TEST, NO CURRENT FAULTS.

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