# SDR SWIA200718480

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 10, 2007
- Submitted: July 18, 2007
- Operation: Air carrier
- Aircraft: [N447SW](https://openairdocs.org/aircraft/N447SW), registered now
- Make and model: Cndair CL6002B19
- Aircraft serial: 7677
- Aircraft time: 13,445 hours, 10,344 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Autopilot Sys
- Condition: Malfunctioned
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWIA200718480

## Discrepancy

FLT 3900 - PRE-SELECTED ALTITUDE CHANGES SPONTANEOUSLY AFTER BEING SET CAUSING THE AUTOPILOT TO OVERSHOOT ASSIGNED ALTITUDES.  FCC DIAGNOSTICS HAD NO FAULTS LOGGED.  ALTITUDE SELECT FUNCTIONS NORMALLY.  NO DISCREPANCY NOTED.

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