# SDR SCNA20260928409

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 20, 2026
- Submitted: September 28, 2026
- Operation: Air carrier
- Aircraft: [N8111A](https://openairdocs.org/aircraft/N8111A), registered now
- Make and model: Boeing 737-800
- Registry model: [Boeing 737-800](https://openairdocs.org/model/boeing-737-800) (OpenAirDocs)
- Aircraft serial: 33544
- Aircraft time: 64,184 hours, 40,309 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fmc
- Condition: Faulted
- Stage of operation: DE
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SCNA20260928409

## Discrepancy

VNAV GROSSLY MISCALCULATED THE DESCENT PATH ON THE ARRIVAL & CALCULATED A PATH SO STEEP THE A/C HAD TO DESCEND 5000 FPM TO MAINTAIN THE CALCULATED PATH THIS WAS ALSO WHEN THE A/C SHOULD HAVE BEEN ATTEMPTING TO SLOW FROM 280 TO 250 KNOTS.  PERFORMED FMCS BITE PROCEDURE IAW AMM 34-21 TAK 801 NO CURRENTLY ACTIVE FAULTS NOTED A/C GOOD FOR SRVICE

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