# SDR ASAA2021061935118

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 19, 2021
- Submitted: June 21, 2021
- Operation: Air carrier
- Aircraft: [N559AS](https://openairdocs.org/aircraft/N559AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35178
- Aircraft time: 52,655 hours, 15,541 cycles
- System (JASC): [2210 · Autopilot System](https://openairdocs.org/jasc/2210)
- Part: Knob
- Condition: Intermittent
- Location: Altimeter
- 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/ASAA2021061935118

## Discrepancy

F/O DCP ALTIMETER ADJUSTMENT KNOB INTERMITTENTLY ADJUST MORE THAN COMMANDED. GROUNDED - YES. PERFORMED DCP ALTIMETER ADJUSTMENT KNOB TEST PER B737-800 AMM 22-11-34. COULD NOT DUPLICATE FAULT. OPS CHECK OK.

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