What was found
AIRCRAFT WAS NOT GROUNDED: WHILE PERFORMING EPSU SYSTEM TEST SOME EMERGENCY LIGHTS CONTINUE TO STAY ON AFTER TEST IS ACCOMPLISHED. MAINTENANCE REPLACED L2 EPSU BATTERY WITH A SERVICEABLE-UNIT IAW AMM 33-51-38.
- Difficulty date
- June 19, 2026
- Submitted
- June 22, 2026
- Operation
- Air carrier
- Aircraft
- N412UW
- Make and model
- Airbus A321253NX
- Aircraft serial
- 9224
- Aircraft time
- 22,701 hours, 6,213 cycles
- System (JASC)
- 3350 · Emergency Lighting
- Part
- Battery
- Part number
- AD321431
- Condition
- No Test
- 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.