# SDR ASAA2018091026067

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 8, 2018
- Submitted: September 10, 2018
- Operation: Air carrier
- Aircraft: [N435AS](https://openairdocs.org/aircraft/N435AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 43292
- Aircraft time: 19,651 hours, 6,477 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Warning System
- Condition: False Activation
- Location: Cockpit
- Stage of operation: CR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2018091026067

## Discrepancy

DURING CRUISE "VTK" "MAP" DISPLAYED ON CAPT ND. SIMULTANOUSLY "LDG ALT" DISPLAYED ON CAPT PFD. PROCEDURE FOR LEFT FMC FAILURE FOLLOWED. GROUNDED - YES. PERFORMED FMC BITE REF FIM 34-61 TASK 801. FOUND NO CURRENT FAULTS OF SENSORS. THIS FMC LOGGED A "PGM FAULT" ON 08 SEP18. T/S PER FIM 34-61 TASK 807, REF PARA A(4) "DO NOT REPLACE THE FMC. IF THE ONLY MSG IS PGM FAULT." COMPLETED TEST OF L-FMC, AND FMC PROMPT SHOWS ON MCDU.

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