# SDR UPS04542421

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 25, 2004
- Submitted: May 26, 2004
- Operation: Air carrier
- Aircraft: [N420UP](https://openairdocs.org/aircraft/N420UP), registered now
- Make and model: Boeing 757-24APF
- Registry model: [Boeing 757-24APF](https://openairdocs.org/model/boeing-757-24apf) (OpenAirDocs)
- Aircraft serial: 23907
- System (JASC): [2420 · AC Generation System](https://openairdocs.org/jasc/2420)
- Part: Filter
- Part number: 729825H
- Part serial: C0918
- Condition: Contaminated
- Location: Idg
- Stage of operation: DE
- How discovered: O
- Nature of condition: H
- Precautionary procedure: B
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UPS04542421

## Discrepancy

DESCENDING THROUGH 250, LT GEN OFF LIGHT CAME ON.  THEN LT & RT BUSS OFF LIGHTS ILLUMINATED WITH SUBSEQUENT LOSS OF ALL INSTRUMENTS.  FOUND CONTAMINATION IN BOTH IDG FILTERS.  REPLACED BOTH LEFT AND RIGHT IDG AND OPS CHECKED NORMAL.  P/N OFF 729825E, S/N OFF C0607, P/N OFF 729825H, S/N OFF C0918.

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