# SDR YENA2023122201641

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 18, 2023
- Submitted: December 22, 2023
- Operation: Air carrier
- Aircraft: [N4077J](https://openairdocs.org/aircraft/N4077J), registered now
- Make and model: Airbus A321-271N
- Registry model: [Airbus A321-271N](https://openairdocs.org/model/airbus-a321-271n) (OpenAirDocs)
- Aircraft serial: 11604
- Aircraft time: 92 hours, 16 cycles
- System (JASC): [4900 · Airborne Auxiliary Power Unit (APU) System](https://openairdocs.org/jasc/4900)
- Part: Apu
- Part number: 38007081
- Part serial: P10664
- Condition: Failed
- Location: 4005km
- Part time: 56 hours, 28 cycles
- Stage of operation: UK
- How discovered: V
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/YENA2023122201641

## Discrepancy

FLT#32, AMS-BOS. (ETOPS) 'REF MDDR 537527 APU REMOVAL AND REPLACEMENT; REMOVED AND REPLACED APU PER AMM 49-11-11, OPS CHECK GOOD.'

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.