# SDR DALA2017033102600

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 30, 2017
- Submitted: March 31, 2017
- Operation: Air carrier
- Aircraft: [N823DX](https://openairdocs.org/aircraft/N823DX), registered now
- Make and model: Boeing 757-26D
- Registry model: [Boeing 757-26D](https://openairdocs.org/model/boeing-757-26d) (OpenAirDocs)
- Aircraft serial: 33967
- Aircraft time: 28,698 hours, 16,762 cycles
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Controller
- Condition: Inoperative
- Location: Cabin Pressure
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: B
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2017033102600

## Discrepancy

DUE TO A CABIN ALTITUDE WARNING, THE FLIGHT DESCENDED TO 10000 FT.  MAINTENANCE PERFORMED BITE OF BOTH CABIN PRESSURIZATION CONTROLLERS. NR 1 CONTROLLER UNABLE TO BITE AND NR 2 CONTROLLER CHECKED OK. REPLACED THE NR 1 CONTROLLER AND PRESSURIZATION CONTROL PANEL IAW AMM. ENGINE RUN/ PRESSURIZATION CHECKED OK.

---
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.