What was found
AIRCRAFT WAS NOT GROUNDED: EMERGENCY POWER SUPPLY UNIT 15WL FAILED BATTERY BITE TEST. MAINTENANCE REPLACED EMERGENCY POWER SUPPLY UNIT 15WL BATTERY IAND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 33-51-38.
- Difficulty date
- April 8, 2026
- Submitted
- April 10, 2026
- Operation
- Air carrier
- Aircraft
- N523UW
- Make and model
- Airbus A321231
- Aircraft serial
- 3960
- Aircraft time
- 56,245 hours, 21,473 cycles
- System (JASC)
- 3350 · Emergency Lighting
- Part
- Battery
- Part number
- AD321431
- Condition
- Failed
- 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.