# SDR DL75A050737

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 23, 2005
- Submitted: December 6, 2005
- Operation: Air carrier
- Aircraft: [N757AT](https://openairdocs.org/aircraft/N757AT), registered now
- Make and model: Boeing 757212
- Aircraft serial: 23127
- Aircraft time: 58,429 hours, 28,883 cycles
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Controller
- Part number: 2117338813
- Part serial: 1081586
- Condition: Failed
- Location: Cabin Pressure
- Stage of operation: CR
- How discovered: O
- Nature of condition: S
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DL75A050737

## Discrepancy

BOTH AUTOPRESSURIZATION CONTROLLERS FAILED AT THE SAME TIME AT FL350 WAS ABLE TO CONTROL OUTFLOW VALVE IN MANUAL.  DESCENDED TO 10,000 AND DIVERTED TO MCO.  REPLACED NR 2 AUTO CONTROLLER DUE TO A LOSS OF AC POWER LAST FLT FAULT ON BITE.  BITE AND VERIFICATION OF NR 1 AND NR 2 AUTO CONTROLLERS CHECK OK.  MANUAL OPERATION NORMAL.

---
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.