What was found
AIRCRAFT WAS GROUNDED: BATTERY FAULT FOR EMERGENCY POWER SUPPLY UNIT 15WL DISPLAYED DURING SYSTEM TEST. MAINTENANCE REPLACED THE BATTERY AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER TASK CARD 26C00033004.
- Difficulty date
- January 28, 2026
- Submitted
- January 28, 2026
- Operation
- Air carrier
- Aircraft
- N524UW
- Make and model
- Airbus A321231
- Aircraft serial
- 3977
- Aircraft time
- 54,981 hours, 21,017 cycles
- System (JASC)
- 3350 · Emergency Lighting
- Part
- Battery
- Part number
- AD321431
- Condition
- Activation Error
- Location
- Zone 200
- Stage of operation
- IN
- How discovered
- C
- Nature of condition
- L
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.