# SDR SWAA2015100744639

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 5, 2015
- Submitted: October 7, 2015
- Operation: Air carrier
- Aircraft: N380SW
- Make and model: Boeing 737-3H4
- Registry model: [Boeing 737-3H4](https://openairdocs.org/model/boeing-737-3h4) (OpenAirDocs)
- Aircraft serial: 26587
- Aircraft time: 68,514 hours, 55,540 cycles
- System (JASC): [2130 · Cabin Pressure Control System](https://openairdocs.org/jasc/2130)
- Part: Safety Switch
- Part number: 1899
- Condition: Faulty
- Location: Cabin
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2015100744639

## Discrepancy

AIR TURN BACK, CLIMBING THROUGH FL 280, CABIN ALTITUDE WARNING HORN CAME ON.  CABIN WAS CLIMBING THRU 10,000' & AUTO FAIL, PRESSURIZATION, LIGHT WAS ILLUMINATED.  EMER DESCENT TO 9,000' WAS ACCOMPLISHED.  RETURNED & CABIN NOISE NEAR L1 DOOR HEARD BY FLIGHT ATTENDANTS.  FOUND S105 GND SAFETY SWITCH FAULTY.  R & R S105 SWITCH IAW MM.

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