# SDR CALA2017011300074

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 13, 2017
- Submitted: January 14, 2017
- Operation: Air carrier
- Aircraft: [N54241](https://openairdocs.org/aircraft/N54241), registered now
- Make and model: Boeing 737824
- Aircraft serial: 28953
- Aircraft time: 56,250 hours, 19,948 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Computer
- Part number: 4082499902
- Condition: Faulty
- Location: Autopilot
- Part time: 57,209 hours, 19,599 cycles
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2017011300074

## Discrepancy

AUTOPILOT DOES NOT KEEP THE SAME ALTITUDE WITH ALT HLD PITCH MODE SET CMD A.  ENGAGED ON A AUTOPILOT-AIRCRAFT OSCILLATES - + 50 FEET UP TO 400 FT/MIN WHEN ENGUAGED IT PUSHED.  REPLACED FLIGHT CONTROL COMPUTER IAW MM 22-11-33. OPS CHECKED GOOD.

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