# SDR IPXA2026080575871

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 2, 2026
- Submitted: August 6, 2026
- Operation: Air carrier
- Aircraft: [N572UP](https://openairdocs.org/aircraft/N572UP), registered now
- Make and model: Boeing 747-44AF
- Registry model: [Boeing 747-44AF](https://openairdocs.org/model/boeing-747-44af) (OpenAirDocs)
- Aircraft serial: 35669
- Aircraft time: 65,192 hours, 10,331 cycles
- System (JASC): [3350 · Emergency Lighting](https://openairdocs.org/jasc/3350)
- Part: Battery
- Part number: AD20131A
- Part serial: 90080
- Condition: Inoperative
- Location: Zone 200
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/IPXA2026080575871

## Discrepancy

FOUND THE UPPER DECK AISLE EMERGENCY LIGHT INOP.  IAW SSM 33-51-01 REV.47 PERFORMED THE UPPER DECK AISLE EMERGENCY LIGHT SYSTEM CHECK , FOUND THE EMERGENCY LIGHT BATTERY M5168 FUNCTION FAIL.  IAW AMM 33-51-04-902-001-001, REV.117.   REPLACED THE EMERGENCY LIGHT BATTERY M5168 AND PERFORMED UPPER DECK EMERGENCY LIGHT TEST, RESULT WAS SATISFACTORY.

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