# SDR ASAA2017041620471

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 16, 2017
- Submitted: April 18, 2017
- Operation: Air carrier
- Aircraft: [N592AS](https://openairdocs.org/aircraft/N592AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35190
- Aircraft time: 35,414 hours, 10,794 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fmc
- Condition: Out Of Adjust
- Location: Right
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2017041620471

## Discrepancy

FOUND A SINGLE FMC OPERATION NOTE IN SCRATCHPAD. AFTER ALIGNING IRS,  THE FIRST OFFICER`S DISPLAY HAD A MAP FLAG FAILURE INDICATION.  ACFT GROUNDED. CYCLED POWER TO FMC AT SAME TIME AND INDIVIDUALLY, NO HELP. SWAPPED FMC, NO HELP, RETURNED COMPUTERS TO ORIGINAL LOCATIONS IAW AMM 34-61-02. PERFORMED FMC SYSTEM TEST IAW AMM 34-61-00-730-801, FOUND DRAG FACTOR DID NOT MATCH. ADJUSTED DRAG FACTOR IN RT FMC TO -1.3 IAW TABLE 510. MAP FLAG CLEARED AND ALL GROUND VERIFICATION CHECKED GOOD.

---
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.