What was found
AIRCRAFT IN BASE MAINTENANCE: FAULT BAT/EPSU (11W) EXT L MESAGE DISPLAYED DURING SYSTEM TEST - MAINTENANCE REPLACED EMERGENCY POWER SUPPLY UNIT 11WL AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 33-51-38
- Difficulty date
- August 29, 2026
- Submitted
- September 2, 2026
- Operation
- Air carrier
- Aircraft
- N537UW
- Make and model
- Airbus A321231
- Aircraft serial
- 4041
- Aircraft time
- 52,131 hours, 21,114 cycles
- System (JASC)
- 3350 · Emergency Lighting
- Part
- Power Supply
- Part number
- 32146210
- Part serial
- 132861
- Condition
- Fault Message
- 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.