# SDR CALA2020112501299

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 23, 2020
- Submitted: November 25, 2020
- Operation: Air carrier
- Aircraft: [N67827](https://openairdocs.org/aircraft/N67827), registered now
- Make and model: Boeing 737924ER
- Aircraft serial: 44581
- Aircraft time: 20,858 hours, 7,526 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Switch
- Part number: 214C401110
- Condition: Inoperative
- Location: Cabin Pressure
- Stage of operation: IN
- How discovered: C
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2020112501299

## Discrepancy

CABIN ALTITUDE AUTO DROP TEST FAILED.  REMOVED AND REPLACED ALTITUDE PRESSURE SWITCH, IAW AMM 35-22-41.  OPERATIONS CHECK GOOD, IAW AMM 35-22-41.  WORK ACCOMPLISHED BY AAR ROCKFORD MECHANIC V931575.  THIS TEST WAS PERFORMED AS PART OF THE RETURN TO SERVICE PROCESS.

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