# SDR UIEA2026072400653

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 24, 2026
- Submitted: July 24, 2026
- Operation: Air carrier
- Aircraft: [N487MC](https://openairdocs.org/aircraft/N487MC), registered now
- Make and model: Boeing 747-45EF
- Registry model: [Boeing 747-45EF](https://openairdocs.org/model/boeing-747-45ef) (OpenAirDocs)
- Aircraft serial: 30609
- Aircraft time: 103,614 hours, 18,820 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery
- Part number: 20131A
- Part serial: 500987
- Condition: No Test
- 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/UIEA2026072400653

## Discrepancy

FOUND EMERGENCY LIGHT BATTERY M5170 FUNCTION FAIL(<P>1. IAW AMM 33-51-04-902-001-001 REV 107 REPLACED EMERGENCY LIGHT BATTERY PACK (M5170) AT UPPER DECK, CONDITION CHECK NORMAL, AND PERFORMED POWER SUPPLY TEST, RESULT WAS SATISFACTORY</P>)

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