# SDR SWIA201230651

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 7, 2012
- Submitted: May 11, 2012
- Operation: Air carrier
- Aircraft: [N920SW](https://openairdocs.org/aircraft/N920SW), registered now
- Make and model: Cndair CL6002B19
- Aircraft serial: 7660
- Aircraft time: 25,829 hours, 21,797 cycles
- System (JASC): [3417 · Air Data Computer](https://openairdocs.org/jasc/3417)
- Part: Adc
- Condition: Failed
- Location: Nr 1
- Stage of operation: UK
- 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/SWIA201230651

## Discrepancy

FIRST OFFICER'S ALTIMETER INDICATES 150 FEET LOWER THAN CAPTAIN'S SIDE AT FL 340.  STAND-BY ALTIMETER INDICATES 300 FEET HIGHER THAN CAPTAIN SIDE AT FL 340.  (FLT 6456)  PURGED NR 1 AND NR 2 STANDBY PITOT SYSTEMS AND REPLACED NR 1 AIR DATA COMPUTER.

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