# SDR AALA202412067345

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 5, 2024
- Submitted: December 6, 2024
- Operation: Air carrier
- Aircraft: [N431AN](https://openairdocs.org/aircraft/N431AN), registered now
- Make and model: Airbus A321-253NX
- Registry model: [Airbus A321-253NX](https://openairdocs.org/model/airbus-a321-253nx) (OpenAirDocs)
- Aircraft serial: 10385
- Aircraft time: 13,641 hours, 3,635 cycles
- System (JASC): [3397 · Light System Wiring](https://openairdocs.org/jasc/3397)
- Part: Circuit Board
- Part number: 350F51000
- Condition: Defective
- Location: Zone 200
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA202412067345

## Discrepancy

AIRCRAFT WAS GROUNDED: WHEN EMERGENCY EXIT LIGHT SWITCH IS OFF, THE OFF LIGHT DOES NOT ILLUMINATE. MAINTENANCE FOUND BAD ANNUNCIATOR LIGHT INTERFACE BOARD 7LP PER TSM 33-51-00-810-816  AND REPLACED IT PER AMM 33-14-33. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED.

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