What was found
DURING HEAVY CHECK EPSU UNIT 12WL CLASS 1 FAULT DURING A SCHEDULED RON MAINTENANCE. A/C WAS NOT GROUNDED. REMOVED AND REPLACED EPSU BATTERY (12WL) IAW AMM 33-51-38-000-002-A/33-51-38-400-002-A. OPS CHECK GOOD. OK FOR SERVICE.
- Difficulty date
- February 6, 2026
- Submitted
- February 6, 2026
- Operation
- Air carrier
- Aircraft
- N637FR
- Make and model
- Airbus A321271NX
- Aircraft serial
- 11860
- Aircraft time
- 5,762 hours, 2,687 cycles
- System (JASC)
- 3350 · Emergency Lighting
- Part
- Battery
- Part number
- 321431
- Part serial
- 934981
- Condition
- Failed
- Location
- Zone 200
- 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.