# SDR ASAA0954250

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 17, 2009
- Submitted: January 21, 2009
- Operation: Air carrier
- Aircraft: [N577AS](https://openairdocs.org/aircraft/N577AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35186
- Aircraft time: 7,274 hours, 2,137 cycles
- System (JASC): [3460 · Flight Management Computing Hardware System](https://openairdocs.org/jasc/3460)
- Part: Fmc
- Part number: 1762000101
- Part serial: 002524
- Condition: Malfunctioned
- Location: E&E Bay
- Part time: 7,274 hours, 2,137 cycles
- Stage of operation: DE
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA0954250

## Discrepancy

VNAV 1300 FT HIGH AT TOP OF DESCENT.  VNAV SLOWED A/C FIRST THEN WENT TO VNAV SPEED.  VNAV WORKED FINE AT LOWER ALT.  GROUNDED YES.  REMOVED AND REPLACED NR 1 FMC REF MM 34 61 02 OPS CHECKED PER MM 34 61 00.  PART VERIFIED WITH SEAMC MIKE.  VERIFICATION FLIGHT SUCCESSFUL.

---
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.