# SDR DALA2025012000468

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 17, 2025
- Submitted: January 20, 2025
- Operation: Air carrier
- Aircraft: [N504DZ](https://openairdocs.org/aircraft/N504DZ), 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: 10884
- Aircraft time: 10,526 hours, 2,530 cycles
- System (JASC): [4920 · APU Core Engine](https://openairdocs.org/jasc/4920)
- Part: Apu
- Condition: No Test
- Location: Zone 100
- Stage of operation: IN
- How discovered: C
- Nature of condition: L
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/DALA2025012000468

## Discrepancy

AIRCRAFT 5004, ATTEMPTED APU COLD SOAK START. FL 360. SAT -53 C. NO START AFTER 3 ATTEMPTS. CORRECTIVE ACTION: DEFERRED PER MEL 49-10-01A. SUBSEQUENT MAINTENANCE APU SHUTDOWN REPORT SHOWS "NO FLAME" CHECK IGNITION SYSTEM FCU (8022KM) FUEL SUPPLY LAST 7 SHUTDOWNS. REPLACED INGITION UNIT. (LP 6406531)

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