# SDR 2002UALA01336

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 22, 2002
- Submitted: September 24, 2002
- Operation: Air carrier
- Aircraft: [N796UA](https://openairdocs.org/aircraft/N796UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26931
- Aircraft time: 20,472 hours, 3,177 cycles
- Engine: Pwa PW4090
- Engine time: 17,540 hours, 2,816 cycles
- System (JASC): [7261 · Turbine Engine Oil System](https://openairdocs.org/jasc/7261)
- Part: Switch
- Part number: 21SN04413A
- Condition: Malfunctioned
- Location: Nr 1 Engine
- Stage of operation: CR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2002UALA01336

## Discrepancy

NR 1 ENGINE OIL FILTER LT STATUS MESSAGE.  ALSO RIGHT PACK FCV STATUS MESSAGE.  REPLACED THE OIL FILTER DIFFERENTIAL PRESSURE SWITCH.  THE REMOVED SWITCH WAS A PRE PW SERVICE BULLETIN PW4G-112-79-12 CONFIGURATION.  MESSAGE WAS DUE TO FAILED PROX SWITCH ON LWR RT FLOW CONTROL VALVE.

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