# SDR UALA2009082002556

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 20, 2009
- Submitted: August 21, 2009
- Operation: Air carrier
- Aircraft: [N653UA](https://openairdocs.org/aircraft/N653UA), registered now
- Make and model: Boeing 767322
- Aircraft serial: 25391
- Aircraft time: 72,735 hours, 11,872 cycles
- Engine: Pwa PW4060
- System (JASC): [3417 · Air Data Computer](https://openairdocs.org/jasc/3417)
- Part: Indicator
- Part number: S231T1011
- Part serial: 345
- Condition: Malfunctioned
- Location: Nr 2
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2009082002556

## Discrepancy

ALTITUDE DISAGREE, RTFL.  CHECKED F/O SIDE WITH CASTLEBERRY AND VERIFIED FLUCTUATION.  REPLACED RT AIR DATA COMPUTER AND RE-TESTED.  SYSTEM CHECKED OK WITH CASTLEBERRY.  NEEDS CHECK CONFIRMATION WITH LAVERSAB TESTER.  CHECKED ADC'S FOR FAULTS.  ACCOMPLISHED ADC INSPECTION-CHECK AND ACCOMPLISHED ADC'S ADJUSTMENT-TEST.  ALL NORMAL.  REPLACED F/O ALTIMETER.  TESTED GOOD WITH LAVERSAB TESTER.

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