# SDR COZA20110308003

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 16, 2011
- Submitted: March 8, 2011
- Operation: Air carrier
- Aircraft: [N737KA](https://openairdocs.org/aircraft/N737KA), registered now
- Make and model: Boeing 737-7BX
- Registry model: [Boeing 737-7BX](https://openairdocs.org/model/boeing-737-7bx) (OpenAirDocs)
- Aircraft serial: 30740
- Aircraft time: 23,520 hours, 15,867 cycles
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Controller
- Part number: 71211997101AC
- Part serial: 0060359
- Condition: Inoperative
- Location: Cabin Pressure
- Part time: 23,520 hours, 15,867 cycles
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/COZA20110308003

## Discrepancy

RESUBMITTING SDR, NOW WITH UNIQUE CONTROL NUMBER.  ON AIRCRAFT POWER UP, PRESSURIZATION AMBER AUTO FAIL AND GREEN ALT LIGHTS ILLUMINATED ON COCKPIT OVERHEAD.  DURING SUBSEQUENT TROUBLESHOOTING NR 2 CABIN PRESSURE CONTROLLER P/N 7121-19971-01AC FAILED LRU BITE CHECK.  CABIN PRESSURE CONTROLLER WAS REPLACED AND SYSTEM OPERATIONALLY CHECKED NORMAL.

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