# SDR ANCF200300011

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 4, 2003
- Submitted: March 6, 2003
- Operation: Air carrier
- Aircraft: [N262CT](https://openairdocs.org/aircraft/N262CT), registered now
- Make and model: Boeing 757-200 SERIES
- Registry model: [Boeing 757-200 SERIES](https://openairdocs.org/model/boeing-757-200-series) (OpenAirDocs)
- Aircraft serial: 26246
- Aircraft time: 17,346 hours, 13,400 cycles
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Controller
- Condition: Inoperative
- Location: Cabin Pressure
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ANCF200300011

## Discrepancy

EICAS MSG "CABIN AUTO INOP" AND "CABIN ALT AUTO 1&2" DISPLAYED. UNABLE TO CONTROL OUTFLOW VALVE USING MANUAL MODE. AT FL 230 THE CABIN ALTITUD LIGHT COMES ON AND THE CREW MADE A RAPID DESCENT TO FL 100. FIGHT RETURNED TO NEW YORK.  AC MOTOR NR 2 WAS REPLACED IAW AMM 21-31-05/401 AND NR 2 SYSTEM TEST WAS PERFORMED IAW AMM 21-31-00/501 WITH NORMAL RESULTS. AUTOMATIC SYSTEM #1 WAS DIFFERED UNDER MEL 21-31-1 CAT "C".

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