# SDR ASAA2018101026427

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 8, 2018
- Submitted: October 10, 2018
- Operation: Air carrier
- Aircraft: [N531AS](https://openairdocs.org/aircraft/N531AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35199
- Aircraft time: 32,725 hours, 9,693 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Control Module
- Part number: 8243921002
- Part serial: 99064308
- Condition: Defective
- Location: Cockpit
- Part time: 65,880 hours, 25,698 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/ASAA2018101026427

## Discrepancy

FLT ALT WINDOW IS INTERMITTENT. NOT ABLE TO CHANGE DISPLAYED WITH FLIGHT ALT KNOB. GROUNDED - YES. REMOVED AND REPLACED CABIN PRESSURE CONTROL MODULE PER AMM 21-31-02. OPS CHECKED NORMAL.

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