# SDR UPS08451372

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 3, 2008
- Submitted: January 4, 2008
- Operation: Air carrier
- Aircraft: N523UP
- Make and model: Boeing 747-200
- Registry model: [Boeing 747-200](https://openairdocs.org/model/boeing-747-200) (OpenAirDocs)
- Aircraft serial: 22381
- System (JASC): [3417 · Air Data Computer](https://openairdocs.org/jasc/3417)
- Part: Cadc
- Condition: Malfunctioned
- Location: Nr 1
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UPS08451372

## Discrepancy

INSPECTION TYPE:N/A ATB - RVSM - CAPTAINS ALTIMETER 1500' OF ALTITUDE AT 330, WENT TO ALT STATIC SOURCE.  AS PER MM 34-11-00 AND 34-12-01 INSP NR 1 CADC AND PITOT STATIC SYS.  DRAINED SOME WATER FROM STATIC LINES.  REMOVED AND REPLACED NR 1 CADC PER MM 34-12-01 & LEAK CHECK GOOD.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.