What was found
AIRCRAFT WAS NOT GROUNDED: EMERGENCY POWER SUPPLY UNIT SYSTEM TEST FAILED DURING PS CHECK. REMOVED AND REPLACED AFT EMERGENCY POWER SUPPLY UNIT 13WL PER AMM 33-51-38.
- Difficulty date
- July 10, 2021
- Submitted
- July 12, 2021
- Operation
- Air carrier
- Aircraft
- N549UW
- Make and model
- Airbus A321231
- Aircraft serial
- 4932
- Aircraft time
- 32,123 hours, 12,060 cycles
- System (JASC)
- 3350 · Emergency Lighting
- Part
- Power Supply
- Condition
- Failed
- Location
- Emergency Light
- Stage of operation
- IN
- How discovered
- V
- Nature of condition
- O
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.