# SDR AALA20150312007

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 12, 2015
- Submitted: March 13, 2015
- Operation: Air carrier
- Aircraft: [N811NN](https://openairdocs.org/aircraft/N811NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 31079
- Aircraft time: 17,431 hours, 6,693 cycles
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Controller
- Condition: Faulty
- Location: Cabin Pressure
- Stage of operation: TO
- 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/AALA20150312007

## Discrepancy

AIR INTERRUPT, NO EMER DECLARED.  LANDING UNEVENTFUL & ACFT WAS NOT OVERWEIGHT.  LOUD SQUEAL DURING TAKEOFF ROLL FROM FLIGHT DECK WINDOW.  PRESSURIZATION CONTROLLER INDICATED AUTO FAIL & GREEN ALTERNATE LIGHT ON.  FLIGHT RETURNED.  REPLACED NR 2 APC IAW AMM 21-31-01.  SYS CHECKED NORMAL.

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