What was found
AIRCRAFT WAS NOT GROUNDED: EMERGENCY POWER SUPPLY UNIT 13WL (AFT L) FAILED TEST PER PERIODIC SERVICE CHECK. REMOVED AND REPLACED EMERGENCY POWER SUPPLY UNIT 13WL (AFT L) BATTERY IAW AMM 33-51-38.
- Difficulty date
- October 10, 2020
- Submitted
- October 13, 2020
- Operation
- Air carrier
- Aircraft
- N524UW
- Make and model
- Airbus A321231
- Aircraft serial
- 3977
- Aircraft time
- 39,633 hours, 14,338 cycles
- System (JASC)
- 3350 · Emergency Lighting
- Part
- Battery
- Part number
- 321431
- Condition
- Inoperative
- Location
- Emergency Lights
- 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.