What was found
AIRCRAFT IN BASE MAINTENANCE: FAULT MESSAGE DISPLAYED FOR EMERGENCY POWER SUPPLY UNIT 12WL DURING SYSTEM TEST. REPLACED BATTERY FOR EMERGENCY POWER SUPPLY UNIT 12WL AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK POER AMM33-51-38.
- Difficulty date
- May 7, 2025
- Submitted
- May 8, 2025
- Operation
- Air carrier
- Aircraft
- N551UW
- Make and model
- Airbus A321231
- Aircraft serial
- 4940
- Aircraft time
- 43,124 hours, 17,099 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.