# SDR U2RA2026102400066

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 20, 2026
- Submitted: October 24, 2026
- Operation: Air carrier
- Aircraft: [N919CA](https://openairdocs.org/aircraft/N919CA), registered now
- Make and model: Boeing 747428
- Aircraft serial: 25302
- Aircraft time: 119,245 hours, 17,955 cycles
- Engine: Ge CF680C2B1F
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Power Supply
- Part number: BPS73
- Part serial: 20841
- Condition: Faulted
- Location: Zone 200
- 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/U2RA2026102400066

## Discrepancy

UPPER DECK EMER LIGHT POWER SUPPLY M5056 NOT OPERATE.  REPLACED UPPER DECK EMER LIGHT POWER SUPPLY (M5056) AND EMER LIGHT CHECK NORMAL AND THEN POWER SUPPLY TEST SWITCH CHECK NORMAL PER AMM 33-51-04-11 ITEM  345.

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