# SDR ASAA2019022428319

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 24, 2019
- Submitted: March 1, 2019
- Operation: Air carrier
- Aircraft: [N493AS](https://openairdocs.org/aircraft/N493AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41727
- Aircraft time: 11,309 hours, 3,774 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fmc
- Condition: Malfunctioned
- Location: Nr 1
- 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/ASAA2019022428319

## Discrepancy

LEFT FMC FAIL. THE LEFT FMC FAILED TWICE AT CRUISE ALTITUDE WITH VTK ON CAPT NAV DISPLAY HOWEVER SYSTEM RESET 30 SECONDS AND OPS NORMAL. THE FMC FAILED A THIRD TIME AND DIDN'T RESET IMMEDIATELY. RAN FMC QRH AND PLACED FMC SWITCH ON OVERHEAD PANEL TO BOTH ON R. GROUNDED - YES. REPLACED NR 1 FMC, LOADED ALL CURRENT SOFTWARE. AMM TASK 34-61-02-000-801. OPS. TEST 34-61-00-710-801 AMM. SYS TEST 34-61-00-730-801 AMM. PERF FACTORS TEST 34-61-00-800-801 AMM.

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