What was found
AIRCRAFT WAS NOT GROUNDED: 335100 BAT/EPSU FAULT FOR EMERGENCY POWER SUPPLY UNIT 12WL DISPLAYED DURING SYSTEM TEST. REPLACED EMERGENCY POWER SUPPLY UNIT AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 33-51-38.
- Difficulty date
- November 25, 2025
- Submitted
- November 26, 2025
- Operation
- Air carrier
- Aircraft
- N901AA
- Make and model
- Airbus A321231
- Aircraft serial
- 7636
- Aircraft time
- 26,089 hours, 10,559 cycles
- System (JASC)
- 3350 · Emergency Lighting
- Part
- Power Supply
- 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.