# SDR UIEA2026020500040

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 5, 2026
- Submitted: February 5, 2026
- Operation: Air carrier
- Aircraft: [N481MC](https://openairdocs.org/aircraft/N481MC), registered now
- Make and model: Boeing 747443
- Aircraft serial: 32339
- Aircraft time: 91,419 hours, 11,972 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery
- Part number: 20131A
- Part serial: 505459
- 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/UIEA2026020500040

## Discrepancy

FOUND EMERGENCY LIGHT BATTERY (M7928) FUNCTION FAILED.  IAW AMM 33-51-04-902-001-001 REV 115.  R & R EMERGENCY LIGHT BATTERY (M7928) & PERFORMED EMERGENCY LIGHT BATTERY INSTALLATION TEST, TEST WAS GOOD.

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