# SDR UIEA2019121076018

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 6, 2019
- Submitted: December 10, 2019
- Operation: Air carrier
- Aircraft: [N416MC](https://openairdocs.org/aircraft/N416MC), registered now
- Make and model: Boeing 747-47UF
- Registry model: [Boeing 747-47UF](https://openairdocs.org/model/boeing-747-47uf) (OpenAirDocs)
- Aircraft serial: 32838
- Aircraft time: 74,769 hours, 12,357 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fmc
- Part number: 4052508960
- Part serial: 46607423
- Condition: Malfunctioned
- Stage of operation: CL
- How discovered: O
- Nature of condition: G
- Precautionary procedure: J, A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2019121076018

## Discrepancy

DUAL FMC FAIL IMMEDIATELY AFTER TAKEOFF, FAILED 8-10 TIMES ENROUTE.(<P>PERFORMED FMC L & R GROUND TEST IAW AMM 34-61-00, NO DEFECTS NOTED. PERFORMED FMC L & R SERVO LOOP GROUND TEST, NO DEFECT NOTED.</P><P>LP 1077093  - M6: WHEN GROUND POWER WAS PULLED, PROBLEM REPEATED. REMOVED AND REPLACED L FMC IAW AMM 34-61-01. PERFORMED GROUND TEST IAW AMM 34-61-01, NO DEFECTS NOTED. OFF PART (PN: 4052508-960, SN: 02348927).</P><P>LP 1077094 - M7: REMOVED AND REPLACED R FMC IAW AMM 34-61-01. PERFORMED SOFTWARE CROSSLOAD IAW AMM 34-61-00. PERFORMED GROUND TEST IAW AMM 34-61-00, NO DEFECTS NOTED. PERFORMED AUTOLAND UNIQUE TEST IAW AMM 22-10-00. AIRCRAFT REMAINS CATIIIB. </P>)

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