What was found
AIRCRAFT WAS GROUNDED: FAULT MESSAGE DISPLAYED FOR EMERGENCY POWER SUPPLY UNIT 10WL DURING SYSTEM TEST. REPLACED EMERGENCY POWER SUPPLY UNIT AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 33-51-38.
- Difficulty date
- June 21, 2025
- Submitted
- June 23, 2025
- Operation
- Air carrier
- Aircraft
- N521UW
- Make and model
- Airbus A321231
- Aircraft serial
- 3944
- Aircraft time
- 51,681 hours, 19,816 cycles
- System (JASC)
- 3350 · Emergency Lighting
- Part
- Power Supply
- Part number
- 32146210
- Part serial
- 151798
- Condition
- No Test
- Location
- Zone 200
- Part time
- 26,762 hours, 10,635 cycles
- 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.