# SDR ASAA2017081421633

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 14, 2017
- Submitted: August 28, 2017
- Operation: Air carrier
- Aircraft: [N428AS](https://openairdocs.org/aircraft/N428AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36353
- Aircraft time: 5,829 hours, 1,922 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fmc
- Part number: 1762000101
- Part serial: 010657
- Condition: Failed
- Location: Left
- Part time: 5,901 hours, 1,951 cycles
- Stage of operation: NR
- 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/ASAA2017081421633

## Discrepancy

LEFT FMC FAILED SEVERAL TIMES AND THEN RECOVERED. THE THIRD TIME IT FAILED IT DID NOT RECOVER.  ACFT GROUNDED.  CONFIRMED FAULT, LT FMC SHOWS FMC FAULTS.  REMOVED & REPLACED THE LT FMC IAW AMM 34-61-02,  SOFTWARE CROSSLOAD ACCOMPLISHED IAW AMM 34-61-00-470-806. ACCOMPLISHED FMCS PERFORMANCE FACTORS ADJUSTMENT (DRAG FACTOR) IAW AMM 34-61-00-800-801 & FMC SOFTWARE CONFIGURATION CHECKED IAW AMM 34-61-00-750-801, OPS CHECKED NORMAL. POSITIONED FMC SOURCE SELECT SWITCH BACK TO NORMAL POSITION.

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