What was found
AIRCRAFT WAS GROUNDED: DURING EMERGENCY POWER SUPPLY UNIT SYSTEM TEST FAULT MESSAGE EMERGENCY POWER SUPPLY UNIT (10WL) FORWARD LEFT. REPLACED 10WL EMERGENCY POWER SUPPLY UNIT BATTERY.
- Difficulty date
- June 19, 2024
- Submitted
- June 20, 2024
- Operation
- Air carrier
- Aircraft
- N542UW
- Make and model
- Airbus A321231
- Aircraft serial
- 4134
- Aircraft time
- 48,535 hours, 18,545 cycles
- System (JASC)
- 3350 · Emergency Lighting
- Part
- Battery
- Part number
- AD321431
- Condition
- Inoperative
- Location
- Emergency Lights
- Stage of operation
- IN
- How discovered
- C
- Nature of condition
- O
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.