# SDR 99UAL900308

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 5, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N810UA](https://openairdocs.org/aircraft/N810UA), registered now
- Make and model: Airbus A319-131
- Registry model: [Airbus A319-131](https://openairdocs.org/model/airbus-industrie-a319-131) (OpenAirDocs)
- Aircraft serial: 843
- Engine: Iae V2522A5
- System (JASC): [4970 · APU Indicating System](https://openairdocs.org/jasc/4970)
- Part: Switch
- Condition: Failed
- Location: Apu Oil Sys
- Component: Sundstrand, 4950488
- Stage of operation: NR
- Nature of condition: B
- Precautionary procedure: H
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99UAL900308

## Discrepancy

CREW REPORTS SMOKE IN THE CABIN.  EXTERNALLY LEAKING LOW OIL PRESSURE (LOP) SWITCH CAUSED OIL TO FLOW OVER LOAD COMPRESSOR CASE WHICH WAS REINJESTED INTO THE APU AND CAUSED ODOR OR SMOKE.  THE APU (APS3200 SERIAL NUMBER 1413) WAS REMOVED AND ROUTED THROUGH SUNDSTRAND WHO CHANGED THE LOP SWITCH AND RETURNED THE UNIT TO SERVICE (CURRENTLY INSTALLED IN AIRCRAFT 4217).

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