# SDR ASAA1058603

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 9, 2010
- Submitted: December 10, 2010
- Operation: Air carrier
- Aircraft: [N558AS](https://openairdocs.org/aircraft/N558AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35177
- Aircraft time: 16,785 hours, 4,927 cycles
- System (JASC): [3520 · Passenger Oxygen System](https://openairdocs.org/jasc/3520)
- Part: Pressure Switch
- Part number: 2140401110
- Condition: Failed
- Location: Cabin O2
- Stage of operation: IN
- How discovered: C
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA1058603

## Discrepancy

CABIN OXYGEN DROP FAILED AUTOMATIC ACTUATION TEST.  REMOVED AND REPLACED ALTITUDE PRESSURE SWITCH.

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