# SDR YENA2025100901018

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 8, 2025
- Submitted: October 9, 2025
- Operation: Air carrier
- Aircraft: [N4022J](https://openairdocs.org/aircraft/N4022J), registered now
- Make and model: Airbus A321-271NX
- Registry model: [Airbus A321-271NX](https://openairdocs.org/model/airbus-s-a-s-a321-271nx) (OpenAirDocs)
- Aircraft serial: 10303
- Aircraft time: 15,847 hours, 2,345 cycles
- System (JASC): [2612 · Fire Detection](https://openairdocs.org/jasc/2612)
- Part: Fire Loop
- Part number: 455001
- Part serial: 25940
- Condition: Failed
- Location: Zone 100
- Part time: 15,847 hours, 2,345 cycles
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/YENA2025100901018

## Discrepancy

FLT#8485, BHM-BOS. (ETOPS) "APU LOOP A FAILED ( APU FIRE DETECTION SYSTEM LOOP A .  REMOVED AND REPLACED APU LOOP  IAW AMM 26-13-15 OPS CHECK GOOD. MX-4 UPDATED, STICKER REMOVED AC OK TO SVC.

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