# SDR AALA20150322001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 21, 2015
- Submitted: March 24, 2015
- Operation: Air carrier
- Aircraft: [N9409F](https://openairdocs.org/aircraft/N9409F), registered now
- Make and model: Doug DC-9-83
- Registry model: [Doug DC-9-83](https://openairdocs.org/model/douglas-dc-9-83) (OpenAirDocs)
- Aircraft serial: 53121
- Aircraft time: 60,870 hours, 32,885 cycles
- System (JASC): [2197 · Air Conditioning System Wiring](https://openairdocs.org/jasc/2197)
- Part: Wire
- Condition: Shorted
- Location: Pressure Switch
- Stage of operation: CL
- How discovered: O
- Nature of condition: G
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA20150322001

## Discrepancy

BOTH PACKS FAILED AFTER TAKEOFF.  UNABLE TO PRESSURIZE.  EMERGENCY DECLARED.  LANDING UNEVENTFUL.   FOUND LT & RT DIFFERENTIAL PRESSURE SWITCH WIRES SHORTED TO GROUND.  REPAIRED WIRES IAW SWPM 20-10-01.  OPS CHECKED NORMAL.

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