What was found
AIRCRAFT IN BASE MAINTENANCE: DURING OPERATIONAL TEST OF EMERGENCY LIGHTS, EMERGENCY POWER SUPPLY UNIT 14WL FAULTED. REPLACED BATTERY PER AMM 33-51-38-000-002-A, 33-51-38-400-002-A AND 33-51-00-710-001-A.
- Difficulty date
- July 5, 2021
- Submitted
- July 7, 2021
- Operation
- Air carrier
- Aircraft
- N977UY
- Make and model
- Airbus A321231
- Aircraft serial
- 5409
- Aircraft time
- 27,170 hours, 10,816 cycles
- System (JASC)
- 3350 · Emergency Lighting
- Part
- Battery
- Part number
- AD321431
- Condition
- No Test
- Location
- Emergency Lights
- 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.