# SDR 2007UALA04819

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 26, 2007
- Submitted: November 27, 2007
- Operation: Air carrier
- Aircraft: [N105UA](https://openairdocs.org/aircraft/N105UA), registered now
- Make and model: Boeing 747451
- Aircraft serial: 26473
- Aircraft time: 55,105 hours, 6,683 cycles
- Engine: Pwa PW4056
- System (JASC): [2612 · Fire Detection](https://openairdocs.org/jasc/2612)
- Part: Switch
- Part number: P4100822
- Condition: Dirty
- Location: Fire Detection
- Stage of operation: IN
- How discovered: C
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2007UALA04819

## Discrepancy

FIRE EXT SQUIB TEST PANEL FAILS TO ILLUM ENG 1 WITH TEST SW 1.  SUSPECT DIRTY SWITCH CONTACTS. CLEANED CONTACTS OPS CHECK NORMAL. AC OK FOR SERVICE.

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