# SDR ASAA0956649

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 19, 2009
- Submitted: September 21, 2009
- Operation: Air carrier
- Aircraft: [N566AS](https://openairdocs.org/aircraft/N566AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35181
- Aircraft time: 10,586 hours, 3,325 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Malfunctioned
- Location: Autopilot Sys
- 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/ASAA0956649

## Discrepancy

DESCENT BELOW 10K IN VNAV PATH F/O'S TARGET BUG PROGRAMMED TO 240 KIAS (CORRECT) CAPT'S TARGET BUG DROPPED TO APPROX 205 KIAS BUGS AGREED IN LVL CNG & V/S MODES.  PERFORMED AUTOPILOT FLT FAULT REVIEW NO FAILURES LOGGED.  ADRU BITE CHECKS NORMAL.  SMC HAVE LOGGED FAULT 27 31026 & 27 32026 TROUBLE SHOT PER FIM 34 61 00 810 801.  NO FAILURES NOTED.  FMC BITE PER 34 61 00 810 801 ALSO HAS NO CURRENT OR LOGGED FAULTS.  NO OTHER REPORTED HISTORY.

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