What was found
AIRCRAFT IN BASE MAINTENANCE: FAILED OPERATIONAL CHECK OF EMERGENCY POWER SUPPLY UNITS BY BITE CHECK 14WL ON PASSENGER CABIN. REPLACED BATTERY PACK P/N:AD-3214-31 S/N: 265429 ON EPSU 14WL IAW AMM 33-51-38-400-002-A
- Difficulty date
- July 17, 2021
- Submitted
- July 19, 2021
- Operation
- Air carrier
- Aircraft
- N524UW
- Make and model
- Airbus A321231
- Aircraft serial
- 3977
- Aircraft time
- 41,061 hours, 14,958 cycles
- System (JASC)
- 3350 · Emergency Lighting
- Part
- Battery Pack
- 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.