# SDR ASAA12510943

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 15, 2012
- Submitted: January 18, 2012
- Operation: Air carrier
- Aircraft: [N531AS](https://openairdocs.org/aircraft/N531AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35199
- Aircraft time: 6,405 hours, 2,091 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Control Module
- Part number: 8243921102
- Part serial: 99107115
- Condition: Inoperative
- Location: Cockpit
- Part time: 41,279 hours, 18,371 cycles
- Stage of operation: NR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA12510943

## Discrepancy

FLT ALT SELECTOR SWITCH ON PRESSURIZATION PANEL INOP.  CONFIRMED, STUCK AT 44 500.  PULLED & RESET C/B'S.  WORKED FOR A WHILE, THEN STUCK AT 32 500.  REPLACED CABIN PRESS CTRL MOD.  OPS CHECK GOOD.  GND VERIFICATION GOOD.

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