# SDR YENA2025082500875

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 25, 2025
- Submitted: August 25, 2025
- Operation: Air carrier
- Aircraft: [N4073J](https://openairdocs.org/aircraft/N4073J), 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: 11129
- Aircraft time: 10,106 hours, 1,499 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Pressure Switch
- Part number: 38762552
- Part serial: JB32449
- Condition: Faulted
- Location: Apu Oil Sys
- 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/YENA2025082500875

## Discrepancy

FLT#32, AMS-BOS. (ETOPS)  APU CLASS 2 MSG ( CLASS II MAINTENANCE MESSAGES DISPLAYED ); NO ACTIVE FAULTS. T/S PER TSM 49-00-81-810-868-A. ACCOMPLISHED CONTINUITY CHK OF LOW OIL PRESSURE SWITCH + A/C WIRING WITH NO DEFECTS. RESISTANCE SATISFACTORY/ WITHIN SPECIFIED RANGE. AS PRECAUTIONARY R/R LOW OIL PRESSURE SWITCH IAW AMM 49-94-14. OPS CHK GOOD. MDDR CLEARED. MX-4 UPDATED. PLACARD REMOVED.

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