What was found
AIRCRAFT IN BASE MAINTENANCE: EMERGENCY POWER SUPPLY UNIT SYSTEM TEST FAILS INTERNAL TEST 12WL EMERGENCY POWER SUPPLY UNIT. REMOVED AND REPLACED EMERGENCY POWER SUPPLY UNIT 12WL PER A321 AMM 33-41-00-861.
- Difficulty date
- July 1, 2021
- Submitted
- July 7, 2021
- Operation
- Air carrier
- Aircraft
- N559UW
- Make and model
- Airbus A321231
- Aircraft serial
- 5292
- Aircraft time
- 28,040 hours, 11,202 cycles
- System (JASC)
- 3350 · Emergency Lighting
- Part
- Power Supply
- Part number
- 32146210
- Part serial
- 132155
- Condition
- Failed
- Location
- Emergency Lights
- Part time
- 30,814 hours, 11,905 cycles
- 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.