What was found
AIRCRAFT WAS NOT GROUNDED: EMERGENCY POWER SUPPLY UNIT 16WL BATTERY FAILED DURING SYSTEM TEST. MAINTENANCE REPLACED BATTERY AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 33-51-38.
- Difficulty date
- December 28, 2025
- Submitted
- December 31, 2025
- Operation
- Air carrier
- Aircraft
- N436AN
- Make and model
- Airbus A321253NX
- Aircraft serial
- 10564
- Aircraft time
- 16,956 hours, 4,600 cycles
- System (JASC)
- 3350 · Emergency Lighting
- Part
- Battery
- Part number
- AD321431
- Condition
- No Test
- 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.