# SDR 2004UALA00060

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 23, 2004
- Submitted: May 5, 2004
- Operation: Air carrier
- Aircraft: [N911UA](https://openairdocs.org/aircraft/N911UA), registered now
- Make and model: Boeing 737522
- Aircraft serial: 25255
- Aircraft time: 35,042 hours, 26,364 cycles
- Engine: Ge CFM56*
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Controller
- Part number: 7638101
- Part serial: 79J7155
- Condition: Malfunctioned
- Location: Cabin Pressure
- Stage of operation: CL
- 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/2004UALA00060

## Discrepancy

RETURNED TO THE FIELD WHEN UNABLE TO PRESSURIZE PLANE. SUPPLEMENTAL DATA UPDATE ACCOMPLISHED LEAK CHECK. PRESSURIZED ACFT SEVERAL TIMES ON GROUND ACFT PRESSURIZED NORMAL. NO HARD FAULT WAS ISOLATED. ALL RESPECTIVE ATA SYSTEMS AND SUB-SYSTEMS WERE CHECKED. REPLACED CABIN PRESSURE CONTROLLER  (CPC) AS PRECAUTIONARY.

---
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.