# SDR SWAA2026090460938

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 31, 2026
- Submitted: September 5, 2026
- Operation: Air carrier
- Aircraft: [N8579Z](https://openairdocs.org/aircraft/N8579Z), registered now
- Make and model: Boeing 737-8H4
- Registry model: [Boeing 737-8H4](https://openairdocs.org/model/boeing-737-8h4) (OpenAirDocs)
- Aircraft serial: 63591
- Aircraft time: 27,134 hours, 14,042 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Unknown
- Condition: Odor
- Location: Cockpit
- Stage of operation: DE
- How discovered: O
- Nature of condition: B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SWAA2026090460938

## Discrepancy

STRONG TURBIN ENGINE OIL ODOR DURING DECENCT 14000 & BELOW.   REMOVED AND REPLACED CABIN AIR RECIRCULATION FILTER & E/E COOLING AIR FILTER IAW FIM 71-05, TASK 807, & AMM 21-25-01 C/W  BOROSCOPE STAGES 1-3 HPC PER AMM 72-00-00. PER FIM 71-05 TASK 807.   RAN ENGINES AT PART POWER FOR 15 MINUTES ISOLATED BLEEDS DURING ENGINE RUN THROTTLED BACK ENGINES ONE AT A TIME WITH ENGINE BLEEDS ISOLATED. NO ODOR FROM EITHER ENGINE.  ENGINE RUN PERFORMED IAW AMM 71-71-00.  PERFORMED FIM TASKS AS REQUIRED IAW FIM 71-05 TASK 807.  REMOVED HIGH STAGE VALVE & INSPECTED FOR OIL RESIDUE,  NO SIGNS OF OIL PRESENT. REINSTALLED VALVE IAW AMM 36-11-06.

---
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.