# SDR ASAA2021072735548

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 27, 2021
- Submitted: July 29, 2021
- Operation: Air carrier
- Aircraft: [N563AS](https://openairdocs.org/aircraft/N563AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35180
- Aircraft time: 53,555 hours, 15,823 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fmc
- Condition: Slow
- Stage of operation: NR
- 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/ASAA2021072735548

## Discrepancy

FMC FUNCTIONALITY IS VERY SLOW APPROX. 5 TIMES SLOWER THEN USUAL FUNCTIONALITY. THIS INCLUDES COMPUTING LATERAL AND VERITCAL NAVIGAITON AS WELL AS FUNCTIONS SUCH AS OBTAINING WX, FORWARDING OPERATIONAL REQUEST, LOADING OPERATIONAL DATA ETC. GROUNDED - YES. ACCOMPLISHED FMC BITE REF B737-800 FIM 34-61 TASK 801 NO INFLT FAULTS FOUND. VERIFIED ALL FMC SOFTWARE FOR BOTH FMC MATCHED. NO HISTORY PAST 90 DAYS, FMC OPERATIONAL TEST PASS REF B737-800 AMM 34-61-00-710-804.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.