# SDR ASAA2019052729484

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 27, 2019
- Submitted: May 28, 2019
- Operation: Air carrier
- Aircraft: [N483AS](https://openairdocs.org/aircraft/N483AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36350
- Aircraft time: 15,006 hours, 4,915 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Unknown
- Condition: Malfunctioned
- 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/ASAA2019052729484

## Discrepancy

IN CRUISE, FL360, DUAL FMC FAILURE. FMC OPERATION PARTIALLY RESTORED; HOWEVER ROUTE & PERF INFO WERE DELETED. WHILE A/T LIM FLAG AND AMBER "LDG ALT" REMAIN. LNAV/VNAV OPERATION RESTORED AFTER MANUALLY RE-BUILDING THE BOX IN CRUISE. HOWEVER THE INFORMATION DOES NOT SEEM RELIABLE. GROUNDED - YES. L-FMC LOGGED PGM FAULT. R-FMC LOGGED PRES POS LAT RATE FAULT. RESET BOTH FMC'S. OP CK NORMAL. REF FIM 34-61 TASKS 801 & 837, & AMM 34-61-00-710-801.

---
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.