# SDR ASAA2018092426207

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 21, 2018
- Submitted: September 24, 2018
- Operation: Air carrier
- Aircraft: [N423AS](https://openairdocs.org/aircraft/N423AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 35206
- Aircraft time: 21,687 hours, 7,167 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Control Module
- Part number: 71231997303AB
- Part serial: 99032859
- Condition: Defective
- Location: Cockpit
- Part time: 10 hours, 2 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/ASAA2018092426207

## Discrepancy

CABIN PRESSURE PANEL LIGHTS PULSE IT IS WORST IN DIM SETTING. GROUNDED - YES. REMOVED AND REPLACED CABIN PRESSURE CONTROL SELECTOR MODULE REF AMM 21-31-02. CABIN PRESSURIZATION OPERATIONAL GROUND TEST AND MANUAL MODE TEST CHECKED NORMAL REF AMM 21-31-00.

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