# SDR USAA951044

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 1, 1995
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N656US
- Make and model: Boeing 767-2B7
- Registry model: [Boeing 767-2B7](https://openairdocs.org/model/boeing-767-2b7) (OpenAirDocs)
- Aircraft serial: 26847
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Controller
- Part number: 21173886
- Condition: Failed
- Location: Cabin
- Part time: 9,829 hours
- Stage of operation: CL
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/USAA951044

## Discrepancy

FRA - FL 817, IMMEDIATELY AFTER TAKEOFF FROM FRA, THE AUTO INOP LIGHT ILLUMINATED AND THE EICAS MESSAGES 'CABIN ALT AUTO 1/2' AND 'CABIN AUTO INOP' ILLUMINATED.  FLIGHT RETURNED TO FRA AND LANDED WITH NO FURTHER INCIDENT.  THE NR 1 PRESSURE CONTROL UNIT FAULTED ON BITE AND WAS REPLACED.  ALSO, AS A PRECAUTION, THE OUTFLOW VALVE ASSEMBLY WAS REPLACED.  (M)

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