# SDR U2RA2025100500022

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 23, 2025
- Submitted: October 6, 2025
- Operation: Air carrier
- Aircraft: [N756CA](https://openairdocs.org/aircraft/N756CA), registered now
- Make and model: Boeing 747412
- Aircraft serial: 26547
- Aircraft time: 98,521 hours, 16,008 cycles
- System (JASC): [5210 · Passenger/Crew Doors](https://openairdocs.org/jasc/5210)
- Part: Cartridge
- Part number: 900835AB
- Part serial: 107619
- Condition: Inoperative
- Location: Zone 800
- Part time: 98,521 hours, 16,008 cycles
- 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/U2RA2025100500022

## Discrepancy

DURING A CHECK, UPPER DECK DOOR LT EMERGENCY POWER SYSTEM BATTERY FOUND INOPERATIVE DURING TEST. CARTRIDGE ASSY WAS REPLACED. OPERATIONAL CHECK WAS SATISFACTORY.

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