# SDR ASAA0853038

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 7, 2008
- Submitted: July 1, 2008
- Operation: Air carrier
- Aircraft: [N559AS](https://openairdocs.org/aircraft/N559AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35178
- Aircraft time: 6,732 hours, 1,984 cycles
- System (JASC): [2131 · Cabin Pressure Controller](https://openairdocs.org/jasc/2131)
- Part: Controller
- Part number: 71211997101AC
- Part serial: 0696105
- Condition: Failed
- Location: Cabin Pressure
- Part time: 6,732 hours, 1,984 cycles
- Stage of operation: NR
- How discovered: 9
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA0853038

## Discrepancy

"AUTO FAIL" AND ALTN LIGHT ON "AUTO FAIL" LIGHT GOES OFF WHEN PRESSURIZATION MODE SELECTOR SWITCH MOVED TO ALTN.  VERIFIED NR 2 CABIN PRESSURE CONTROLLER SHOWED CONTROLLER FAILURE.  REPLACED NR 2 CABIN PRESS CONTROLLER.  REF MM 21 31 00.  OPS CHECK GOOD.

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